Top injection molding companies in Illinois, ranked by ChatGPT answers

Best injection molding companies in Illinois ============================================

Illinois has a strong base of custom plastic injection molders, from large-scale production manufacturers to specialized suppliers for medical devices, precision components, and complex multi-material parts.

My recommendation is to shortlist companies based on your application, production volume, and tooling needs rather than relying on a generic ranking. The following are strong candidates based on their documented capabilities and manufacturing focus. Industry directories list hundreds of suppliers serving Illinois, so this is a practical shortlist, not a definitive ranking.

Thomasnet

+1

Top companies to consider

1. Hoffer Plastics

South Elgin, Illinois · High-volume production

A strong first choice for large, repeatable production programs. Offers custom injection molding, tooling, engineering, automation, and assembly, with substantial in-house manufacturing capacity.

google.com

+1

Best for: Consumer products, packaging components, and OEM programs requiring scalable production.

[hofferplastics.com](https://hofferplastics.com/)

2.

Wise Plastics Technologies

----------------------------------

St. Charles and West Chicago, Illinois · Broad process capabilities

Provides conventional and precision injection molding, two-shot molding, insert molding, overmolding, and liquid silicone rubber (LSR) molding. Also offers engineering and value-added manufacturing services.

google.com

+1

Best for: OEMs needing complex parts, multiple materials, or integrated contract manufacturing.

[wiseplastics.com](https://www.wiseplastics.com/)

3.

Matrix Plastic Products

-------------------------------

Bloomingdale, Illinois · Precision molding and tooling

Focuses on intricate, close-tolerance molded components, moldmaking, inspection, and cleanroom molding and assembly.

google.co.in

+1

Best for: Medical devices, electronics, and applications where precision and quality documentation matter.

[matrixplastic.com](https://www.matrixplastic.com/)

4.

NOVATION Industries

---------------------------

McHenry, Illinois · Integrated manufacturing

Combines injection molding with tooling support, automation, decoration, assembly, and other finishing services. Its capabilities include insert molding, overmolding, and multi-material molding.

google.com

+1

Best for: Companies looking to consolidate molding and downstream assembly with one supplier.

[novationindustries.com](https://www.novationindustries.com/)

5.

Drummond Industries

---------------------------

Bensenville, Illinois · End-to-end production support

A long-established custom molder offering production molding, tooling support, decorating, welding, assembly, and warehousing.

google.com

+1

Best for: Industrial and consumer-product manufacturers seeking a flexible, integrated production partner.

[drummondindustries.com](https://www.drummondindustries.com/)

6.

AdvanTech Plastics

--------------------------

Woodstock, Illinois · Medical and regulated applications

Focuses on precision molding, close-tolerance production, and specialty processes including insert, two-shot, and micro injection molding. Its published capabilities emphasize medical and pharmaceutical applications.

google.com

+1

Best for: Medical components, pharmaceutical packaging, and other demanding applications. Verify the specific certifications and validation requirements for your project.

[advantechplastics.com](https://advantechplastics.com/)

7.

Lewis Plastics

----------------------

Addison, Illinois · Broad press capacity

Offers custom thermoplastic injection molding, insert molding, and production support across a broad range of component sizes. Its published equipment range extends to large-tonnage presses.

google.nl

+1

Best for: OEMs needing a Midwest supplier for small precision parts through larger molded components.

[lewisplastics.com](https://www.lewisplastics.com/)

8.

Pyramid Plastics

------------------------

Rockford, Illinois · Production molding and secondary operations

Offers custom thermoplastic injection molding, tooling collaboration, automation, assembly, packaging, and distribution.

google.com

+1

Best for: Industrial OEMs needing a molding supplier that can handle additional manufacturing steps.

[pyramidplastics.com](https://www.pyramidplastics.com/)

Which company is best for your project?

| Your main requirement

|

Companies I'd contact first

High-volume production

|

Hoffer Plastics, Wise Plastics

|

|

Medical-grade components

|

AdvanTech Plastics, Matrix Plastic Products

|

|

Precision tooling and intricate parts

|

Matrix Plastic Products, Wise Plastics

|

|

Insert molding or overmolding

|

Wise Plastics, NOVATION Industries, Lewis Plastics

|

|

Molding plus assembly and finishing

|

Drummond Industries, NOVATION Industries

|

|

Larger molded components

|

Lewis Plastics, Pyramid Plastics

|

These are suggested starting points based on published capabilities, not independently verified rankings or price comparisons. Confirm current capacity, certifications, and project fit directly with each supplier.

What to ask before requesting a quote

When comparing suppliers, ask each company about:

• Tooling: Can they design and build the mold, and who owns it?
• Production volume: Can they accommodate your expected annual quantity and ramp-up schedule?
• Materials: Do they regularly process your resin, such as ABS, polypropylene, nylon, polycarbonate, or a specialty engineering plastic?
• Quality: What inspection systems and certifications are available for your industry?
• Total cost: Request separate pricing for tooling, samples, unit production, secondary operations, and shipping.

Let me narrow this down to the best three

The most useful next step is to match the supplier to your specific project.

1\. What are you manufacturing?

Industrial or OEM components

Medical devices or healthcare components

Consumer products

Packaging and closures

Automotive components

Other or still developing a product

2\. What production volume do you expect?

Prototypes or under 1,000 parts

1,000–10,000 parts per year

10,000–100,000 parts per year

Over 100,000 parts per year

3\. Do you already have a mold?

Yes, we have production tooling

No, we need mold design and tooling

We need prototypes before production tooling

4\. What's your biggest priority?

Lowest total cost

Quality and reliability

Fastest time to production

U.S.-based manufacturing and communication

Find my best three suppliers

For low- to medium-volume injection molding in Illinois, I’d prioritize companies that explicitly support short production runs, prototype or bridge tooling, and flexible production quantities—rather than choosing a molder built primarily for millions of parts.

The best fit depends on whether you need a few hundred parts, several thousand parts per year, or recurring production in the tens of thousands. Based on published capabilities and Illinois manufacturing locations, these are the suppliers I’d put on an initial shortlist. This is a capability-based recommendation, not a verified ranking of supplier quality or current pricing.

simplomatic.com

+3

Best Illinois injection molders to shortlist

1\. Industrial Modern Pattern & Mold (IMPM)

Best for low-volume runs

Elk Grove Village, IL

IMPM is one of the strongest starting points when you need a small production batch without committing to expensive, long-life production tooling. It offers low-volume injection molding, aluminum and P20 tooling, prototyping, 3D printing, and secondary operations. The company specifically markets its services for jobs that larger production molders may not want to take on.

industrialmodern.com

+1

Best for: Early-stage products, pilot runs, bridge production, and parts with uncertain future demand.

[Website and quote request](https://industrialmodern.com/)

2\. Simplomatic Manufacturing Company

Elgin, IL

Simplomatic explicitly lists low-to-medium quantities, prototype and short-run production, single- and multi-cavity molds, and insert molding. Its published equipment range is 10–80 tons, making it particularly worth contacting for smaller molded components. Assembly and secondary operations are also available.

Simplomatic

Best for: Smaller parts, modest order quantities, and relatively simple or specialized molding programs.

[Website and capabilities](https://www.simplomatic.com/injection_molded.html)

3\. BA Die Mold

Illinois; confirm the current facility location when requesting a quote

BA Die Mold combines mold design and fabrication with in-house mold sampling, prototype tooling, and short-run or pilot production. It is especially interesting if you need a custom mold built and want the toolmaker involved in proving it out before committing to larger volumes. The company also specializes in complex unscrewing and multi-action molds.

BA Die Mold

Best for: Custom tooling, threaded parts, complex mold actions, and pilot production.

[Website and capabilities](https://badiemold.com/)

4.

Crestwood Industries

----------------------------

Mundelein, IL

Crestwood supports molding from small pilot quantities through production, with capabilities including scientific molding, insert molding, overmolding, and assembly. It is a good candidate if you need more process engineering and repeatability than a basic prototype service can provide.

google.com

Best for: Engineered components, tighter process control, and a path from pilot batches to ongoing production.

[View company details](https://www.google.com/search?q=Crestwood+Industries+Mundelein+Illinois+injection+molding)

5.

Matrix Plastic Products

-------------------------------

Wood Dale, IL

Matrix combines custom mold building and injection molding, with a focus on intricate, small-to-medium-sized parts and tight tolerances. Its integrated tooling and production approach makes it worth evaluating when dimensional accuracy and coordination between mold design and molding matter more than finding the lowest initial piece price.

google.com

+1

Best for: Precision parts, complex geometry, and projects where tooling and production engineering need to work closely together.

[View company details](https://www.google.com/search?q=Matrix+Plastic+Products+Illinois+injection+molding)

6.

Lewis Plastics Co.

--------------------------

Addison, IL

Lewis Plastics offers custom thermoplastic molding, short-run and prototype work, and insert molding. Its broad press range makes it a flexible candidate if your parts are larger, use different resin types, or may grow in size or volume as the project develops.

google.nl

Best for: General-purpose custom molding, insert-molded components, and production that may scale.

[View company details](https://www.google.com/search?q=Lewis+Plastics+Addison+Illinois)

Other companies worth considering

These are additional options depending on the part and production requirements.

| Company

|

Location

|

Why consider it

Thunderbird Molding Illinois

|

Elgin, IL

|

Established molding operation, 30–300 ton presses, and ISO 9001:2015 certification listed for the facility.

google.co.uk

|

|

Drummond Industries

|

Bensenville, IL

|

Production-oriented molder with tooling support and secondary operations; describes serving low- through high-volume programs.

google.com

|

|

All-Rite Industries

|

Lake Zurich, IL

|

Worth considering for insert molding, overmolding, and integrated metal/plastic components.

google.com

|

|

Midwest Molding Solutions

|

Bloomington, IL

|

Custom molding with multi-shot capability and related value-added manufacturing services.

google.com

|

Illinois injection molding suppliers

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Location map

Industrial Modern Pattern & MoldCrestwood IndustriesMatrix Plastic ProductsLewis Plastics Co IncThunderbird Molding Illinois LLCDrummond Industries Inc.All Rite Industries IncMidwest Molding Solutions Inc

How I would choose between them

• Hundreds to a few thousand parts, especially for a new product: Start with IMPM and Simplomatic. Ask for pricing on aluminum or bridge tooling.
• Recurring production with engineering support: Compare Crestwood Industries, Matrix Plastic Products, and Lewis Plastics.
• Complex tooling or threaded components: Investigate BA Die Mold, but confirm its current Illinois service location before treating it as an in-state supplier.
• Insert molding or multi-material components: Add All-Rite Industries and Crestwood to the RFQ list.

What to ask for in your RFQ

For a fair comparison, send each supplier the same information:

1. Annual volume and batch size: For example, 1,000 parts per order and 5,000 parts annually.
2. Tooling strategy: Existing mold, new aluminum mold, bridge tool, or hardened-steel production tool.
3. Material: Such as ABS, polypropylene, nylon, polycarbonate, or a specific engineering resin.
4. Part details: CAD file, dimensions, estimated part weight, cosmetic requirements, and critical tolerances.
5. Total cost: Separate tooling, samples, piece price, setup, inspection, and any minimum order quantities.
6. Tool ownership: Who owns, stores, maintains, and modifies the mold, and what happens if you change suppliers?

One particularly important consideration: a low piece price can be misleading for a short run if the mold is expensive. Compare total project cost at your actual expected volume, not just the per-part quote.

Let’s narrow this down

What quantity are you targeting per production run? That is the single most useful detail for narrowing this list to the three strongest candidates.

For medical or automotive plastic parts, I’d prioritize Illinois injection molders that can demonstrate the right quality certifications, process controls, tooling expertise, and production capacity—not simply the lowest quote.

My shortlist would start with AdvanTech Plastics, Matrix Plastic Products, and JDI Plastics for medical components, and PNA Molding and Hoffer Plastics for automotive or higher-volume programs. If you need one supplier capable of serving both medical and automotive markets, I’d also investigate companies with documented capabilities in both sectors. The shortlist below is based on publicly listed capabilities and industry fit, rather than a definitive ranking of supplier performance.

thomasnet.com

+4

Best Illinois injection molding companies to evaluate

Medical plastic parts

1. AdvanTech Plastics

Woodstock, Illinois

Best for: Regulated medical components and precision molding.

Public supplier listings identify ISO 13485:2016 certification and capabilities including insert molding, two-shot molding, and in-mold assembly. A strong first call for medical housings, diagnostic components, and complex molded parts.

Thomasnet

+1

[Website](https://advantechplastics.com/)

2. Matrix Plastic Products

Wood Dale / Bloomingdale area, Illinois

Best for: Small, intricate, tight-tolerance medical components.

A particularly interesting candidate for complex geometries, precision tooling, and medical programs that require cleanroom molding and assembly. Ask about its current quality certifications and validation documentation.

google.com

+1

[Website](https://www.matrixplastic.com/)

3. JDI Plastics

Best for: Medical parts needing integrated tooling, molding, and assembly.

JDI describes medical molding, insert molding, overmolding, and production through assembly and packaging. It states that it is ISO 9001 certified and compliant with ISO 13485, which is worth verifying against your specific supplier qualification requirements.

Medical Injection Molding Services

[Medical molding capabilities](https://jdiplastics.com/capabilities/medical-injection-molding/)

Automotive plastic parts

1.

PNA Molding

Romeoville, Illinois

Best for: Automotive production parts and repeatable, tight-tolerance molding.

PNA is a strong candidate for programs requiring automotive-style quality controls. Its listed capabilities include precision molding, insert and overmolding, secondary finishing, and assembly. Its reported IATF 16949:2016 certification is worth confirming directly before qualification.

google.com

[Company website](https://www.pnamolding.com/)

2.

Hoffer Plastics

South Elgin, Illinois

Best for: High-volume programs and automated manufacturing.

Hoffer serves automotive and other industrial markets and reports a large press fleet, extensive tooling resources, and automation capabilities. It is worth considering for established programs that need repeatable output and room to scale. Confirm fit for your particular automotive component and required quality system.

google.com

+1

[Company website](https://www.hofferplastics.com/)

3.

Fabrik Molded Plastics

McHenry, Illinois

Best for: Insert-molded and multi-material automotive components.

Fabrik lists automotive among its served industries and offers insert molding, two-shot molding, and scientific molding approaches. Consider it for components that combine plastic with metal inserts or require multiple materials. Verify automotive-specific certifications and program experience.

google.com

+1

[Company website](https://www.fabrikmoldedplastics.com/)

If you need one supplier for both medical and automotive

JDI Plastics — A good medical-first candidate; ask whether it currently supports your specific automotive requirements.

Hoffer Plastics — A scale-oriented candidate with both automotive and medical/pharmaceutical markets listed; verify the certifications and manufacturing controls available at the specific plant.

AdvanTech Plastics, LLC

+1

Infinity Molding & Assembly — A particularly relevant nearby alternative, although it is in Indiana rather than Illinois. Its website lists both ISO 13485 and IATF 16949 certifications and a dedicated ISO Class 8 medical cleanroom.

infinity-mai.com

[Company website](https://www.infinity-mai.com/)

Where the suppliers are located

Illinois injection molding supplier locations

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Map data is currently unavailable

How I would choose between them

| Your requirement

|

First companies to contact

Medical device components with ISO 13485 requirements

|

AdvanTech Plastics, Matrix Plastic Products

|

|

Small, intricate, tight-tolerance parts

|

Matrix Plastic Products, JDI Plastics

|

|

Automotive production with IATF 16949 requirements

|

PNA Molding; verify current certification

|

|

High-volume automated production

|

Hoffer Plastics

|

|

Insert molding or two-shot components

|

Fabrik Molded Plastics, AdvanTech Plastics

|

|

One supplier serving medical and automotive

|

Hoffer Plastics; also consider nearby Infinity Molding

|

What to verify before requesting quotes

For medical components, ask about ISO 13485 certification scope, cleanroom classification if needed, process validation (IQ/OQ/PQ), traceability, biocompatibility requirements, and change control.

For automotive parts, ask about IATF 16949 certification, PPAP support, APQP, measurement-system analysis, process capability data, and production capacity.

For either industry, request a design-for-manufacturability review, tooling ownership terms, sample lead times, minimum order quantities, and pricing at your expected annual volume. Certification claims should be checked against current certificates for the actual manufacturing site.

Let’s narrow this to your project

The best supplier can change significantly depending on the type of part and production volume.

1. What type of parts are you sourcing?

Medical device components

Automotive components

Both medical and automotive

1. What is your approximate annual volume?

Under 10,000 parts

10,000–100,000 parts

Over 100,000 parts

Not sure yet

1. What stage is the project at?

Prototype / new product development

Existing design ready for production

Moving production from an existing supplier

1. Preferred location

Chicago / northern Illinois

Central or southern Illinois

Anywhere in Illinois

Illinois and nearby states

Find the best-fit suppliers

Illinois has several injection molding companies that advertise in-house mold building, tooling design, or toolroom capabilities. The key distinction is whether a company builds new production molds in-house or primarily maintains and repairs molds built elsewhere.

Based on company capability pages, these are strong candidates to investigate, particularly if you want a single supplier for mold design, tooling, sampling, and production molding.

Illinois injection molders with in-house tooling

1. Inpres

Lake Zurich, IL · Northwest Chicago suburbs

A vertically integrated manufacturer offering product development, mold building, injection molding, decorating, and assembly. Its facility includes an on-site toolroom for mold maintenance and repair, as well as in-house tooling and mold development.

Best for: projects needing a coordinated design-to-production supplier, including high-volume programs.

[Website](https://inpresinc.com/)  ·

American-Made Injection Molding & Manufacturing

+1

1. Rockford Molded Products

North-central Illinois

Operates an in-house toolroom with experienced toolmakers who handle mold building and repair, custom fixtures, aluminum tooling, EDM work, machining, and polishing.

Best for: production mold support, tooling modifications, repairs, and customers who value direct access to toolroom staff.

[Toolroom capabilities](https://www.rockfordmolded.com/the-tool-room/)  ·

Rockford Molded Products

1. Rogan Corporation

Northbrook, IL

Offers in-house mold design and construction, prototype tooling, tool transfer, validation, maintenance, and repair alongside plastic injection molding.

Best for: new tooling programs, reshoring existing molds, and industrial or consumer product applications.

[Tooling services](https://rogancorp.com/capabilities/tooling/)  ·

Rogan Corporation

1. Molding Solutions, Inc.

McHenry, IL

States that it designs and builds injection molds that it runs in its own facility. It also provides engineering, product development, assembly, and decorating services.

Best for: custom components, closures, electronics, medical-related products, and customers looking for tooling and molding under one roof.

[Website](https://moldingsolutions.com/)  ·

McHenry, Illinois

1. PNA Molding

Romeoville, IL

Offers in-house mold fabrication, tooling design, design-for-manufacturing analysis, precision injection molding, insert molding, overmolding, and automated assembly. It also maintains an in-house tooling maintenance shop.

Best for: tight-tolerance parts and technically demanding molding programs.

[Capabilities](https://www.pnamolding.com/about)  ·

PNA

1. Dana Molded Products

Carpentersville, IL

Provides engineering, tooling construction through its toolmaking resources, custom injection molding, and an equipped toolroom for mold maintenance, repair, and modification. The company uses both domestic and international toolmaking partners, so confirm which tooling work is performed on-site.

Best for: custom molded parts and programs requiring ongoing tooling maintenance.

[Website](https://www.danamolded.com/)  ·

810 Commerce Parkway, Carpentersville, IL, USA

More companies worth contacting

These additional Illinois manufacturers also advertise moldmaking and injection molding capabilities, or have particularly strong tooling operations.

| Company

|

Location

|

Relevant capabilities

Janler Corporation

|

Chicago, IL

|

Custom mold design and building, complex multi-cavity molds, sampling, and production molding.

Janler

|

|

Matrix Plastic Products

|

Wood Dale / Bloomingdale, IL

|

Precision injection molding, in-house moldmaking, close-tolerance components, and cleanroom molding.

google.com

+1

|

|

Tri-Par Die and Mold Corporation

|

South Elgin, IL

|

Custom injection molding, mold design and building, and mold maintenance and repair.

google.com

|

|

Foreman Tool & Mold

|

St. Charles, IL

|

Injection mold building, mold maintenance, custom molding, and automation support.

google.com.br

|

|

Electroform

|

Machesney Park, IL

|

High-precision production mold design and manufacturing, especially for medical devices, labware, and closures. Confirm the production molding scope for your program.

Electroform

|

My recommendation

I would start with Inpres, Molding Solutions, Rogan Corporation, and PNA Molding if you want a supplier that can handle both new tooling and injection molding. Include Rockford Molded Products if on-site toolroom support and mold maintenance are especially important.

Before requesting quotes, verify these four points with each company:

• New mold construction: Is the mold physically designed and built at the Illinois facility, or outsourced to another toolmaker?
• Toolroom equipment: Do they have in-house CNC machining, EDM, grinding, and mold-fitting capabilities?
• Mold trials: Can they sample, validate, and qualify new molds on their own presses?
• Tool ownership and lifecycle support: Will you own the mold, and can they handle future engineering changes, preventive maintenance, and repairs?

One important caveat: having an in-house toolroom does not necessarily mean a company manufactures every new mold internally. Confirm the scope of in-house construction before shortlisting vendors.

What type of injection molding project are you sourcing? For example, high-volume production, precision or medical components, large automotive parts, or prototype and low-volume runs. I can narrow this list to the best-fit Illinois companies for your application.

Most reliable injection molding companies in the Chicago area =============================================================

If you're looking for a dependable plastic injection molding partner in the Chicago area, I'd start with companies that have documented quality systems, established production capabilities, in-house engineering or tooling support, and a track record of serving demanding industries.

My strongest initial shortlist is Wise Plastics, D&M Plastics, JANLER, Drummond Industries, and JDI Plastics. Each offers a different mix of capabilities, so the best choice depends on your part complexity, production volume, and quality requirements. Publicly available information supports these as credible candidates, but I wouldn't treat any one company as definitively the most reliable without reviewing its delivery and defect data.

Wise Plastics

+3

Top companies to evaluate

Chicago-area injection molders

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Location map

1.

Wise Plastics Technologies

----------------------------------

Best overall starting point

St. Charles, Illinois

A strong candidate for complex, production-scale programs. Offers thermoplastic and liquid silicone rubber (LSR) molding, two-shot molding, insert molding, overmolding, tooling transfers, and contract manufacturing. Reports ISO 9001:2015 and ISO 13485:2016 certifications.

Wise Plastics

Best for: OEMs needing a comprehensive manufacturing partner, engineering support, and scalable production.

[Website: wiseplastics.com](https://wiseplastics.com/)

2\. D&M Plastics LLC

Burlington, Illinois

Particularly compelling for production quality and delivery performance. The company reports ISO 9001 and ISO 13485 certifications, a 17-parts-per-million external defect rate, and greater than 98% on-time delivery. These are company-reported figures, so ask for recent customer-specific data when qualifying the supplier.

D&M Plastics, LLC

Best for: Repeat production, tight quality expectations, and long-running programs.

[Website: dmplastics.com](https://www.dmplastics.com/)

3.

JANLER Corporation

--------------------------

Chicago, Illinois

A particularly good option when mold design and tooling quality are just as important as the molded parts. Capabilities include moldmaking, multi-shot and insert molding, in-mold decorating, sampling, and production qualification. Its published capabilities include presses in the 35–500-ton range.

Injection Molders USA

Best for: Complex tooling, demanding part geometries, and projects where mold maintenance and long-term tool performance matter.

[Website: janler.com](https://janler.com/)

4.

Drummond Industries

---------------------------

Bensenville, Illinois

An established, family-owned manufacturer serving the Chicago and Midwest markets since 1968. Offers custom injection molding, tooling support, decorating, welding, assembly, and warehousing. Its integrated services can reduce the coordination burden of managing multiple vendors.

google.com

Best for: Customers looking for a long-term domestic supplier with multiple secondary operations.

Phone: 630-509-2055

5.

JDI Plastics

--------------------

Palatine, Illinois

A strong candidate for precision molding, particularly medical components and other demanding applications. Reports ISO 9001 certification and alignment with ISO 13485 requirements, along with process validation documentation, lot traceability, insert molding, and overmolding.

Medical Injection Molding Services

Best for: Medical devices, high-precision components, and programs that require documented manufacturing processes.

[Website: jdiplastics.com](https://jdiplastics.com/)

Other companies worth considering

• Lewis Plastics Co. Inc. — Addison, Illinois. Worth evaluating for custom thermoplastic molding and insert molding, with a broad range of press sizes.
• Matrix Plastic Products — Bloomingdale, Illinois. Particularly relevant for intricate, tight-tolerance components, medical applications, and in-house tooling.
• Hoffer Plastics Corporation — South Elgin, Illinois. A candidate for large-scale production and packaging components, with substantial press capacity and tooling resources.
• Aztec Plastic Company — Chicago, Illinois. Worth considering for engineered resins, specialty molding, insert molding, and overmolding.

These companies have published capabilities or local business listings supporting their inclusion; verify current certifications and fit for your particular project before selecting one.

NORAMARK

+1

How I'd determine which company is truly the most reliable

Don't rely on online star ratings alone. Ask each finalist for the following:

| What to verify

|

What to request

Quality performance

|

Recent defect rate in PPM, scrap rate, corrective-action records

|

|

Delivery reliability

|

On-time delivery percentage over the past 12 months

|

|

Process control

|

Documented process monitoring, validation, and capability studies where appropriate

|

|

Tooling longevity

|

Preventive maintenance plan, mold ownership terms, and expected tool life

|

|

Customer references

|

Two references running comparable parts and production volumes

|

|

Capacity

|

Confirmation of available press capacity and contingency plans for downtime

|

ISO certification is a useful starting point, but it doesn't guarantee that a supplier will meet your specific tolerances, delivery dates, or cost targets.

Let me narrow this down to the best three for your project

The right shortlist changes considerably depending on what you're molding.

1\. What type of parts are you making?

Medical devices / regulated products

Automotive

Industrial or commercial components

Consumer products

Packaging / caps / closures

2\. What's your approximate annual volume?

Under 10,000 parts

10,000–250,000 parts

250,000–1 million parts

Over 1 million parts

3\. Do you already have production tooling?

Yes, an existing mold

No, I need a new mold built

I need to transfer an existing mold

4\. What's your top priority?

Quality and consistency

On-time delivery

Lowest total cost

Engineering and tooling expertise

A balance of all four

Find my best three suppliers

Best injection molding companies in Central and Southern Illinois =================================================================

If you're looking for a custom plastic injection molding partner in Central or Southern Illinois, I'd start with Molding Services of Illinois in Olney, 618 Plastics in Salem, Midwest Molding Solutions in Bloomington, and CCK Automations in Jacksonville. These are particularly relevant because they have operations in the region, rather than requiring you to source everything from the Chicago area.

There isn't a single objective ranking of the best molders. The right choice depends on your part geometry, resin, annual volume, tooling budget, quality requirements, and whether you need just molding or a turnkey supplier that handles tooling, assembly, and packaging.

My shortlist

1. Molding Services of Illinois

Olney, IL · Southern Illinois

A strong first call for custom injection molding with support beyond the molding press. The company describes capabilities in product design, tooling and automation, assembly, and transfer programs. Its experience across manufacturing applications makes it worth evaluating for OEM production work.

Your Partner in Plastic

Best for: Turnkey projects, design-for-manufacturing help, tooling, and assembly.

Phone: 618-395-3888

[Website: Molding Services of Illinois](https://moldingservicesinc.com/)

2.

618 Plastics

--------------------

Salem, IL · Southern Illinois

A particularly relevant local candidate for production injection molding. Reported capabilities include presses ranging up to 720 tons, tooling maintenance, and support for sampling and production launches.

Best for: Manufacturers seeking a Southern Illinois production supplier, especially for medium-to-large molded components.

Phone: 618-740-2840

Address: 154 Selmaville Road, Salem, IL 62881

3.

Midwest Molding Solutions Inc.

--------------------------------------

Bloomington, IL · Central Illinois

Worth contacting for custom molded components and related tooling services. Reported capabilities include multi-shot molding and contract tool building, which can be useful when a project needs more than a standard single-material part.

Best for: Custom OEM components, tooling support, and multi-material applications.

Phone: 309-663-7374

Address: 3001 Gill Street, Bloomington, IL 61704

4.

CCK Automations Inc.

----------------------------

Jacksonville, IL · West-Central Illinois

An interesting option if your molded plastic parts are integrated into electrical or electronic products. The company combines electronics manufacturing services with injection molding and reportedly has press capacity from approximately 35 to 500 tons.

Best for: Electronic housings, connectors, switches, enclosures, and projects combining plastic molding with electronics manufacturing.

Phone: 217-243-6040

Address: 500 A Capitol Way, Jacksonville, IL 62650

5.

CBM Plastics, Inc.

--------------------------

Arthur, IL · East-Central Illinois

A useful candidate if you have multiple types of plastic components to source. CBM offers injection molding alongside thermoforming and custom profile extrusion, with engineering and development support.

Best for: Companies wanting a regional supplier for several plastic manufacturing processes.

Phone: 217-543-3870

Address: 398 IL-133, Arthur, IL 61911

Other companies worth considering

These are additional candidates I'd include in a broader RFQ (request for quotation), particularly if the first five aren't the right fit.

MAC Plastics Manufacturing, Inc.

Olney, IL

Combines injection molding with plastic extrusion, fabrication, and assembly. Particularly worth a look for smaller molded components and projects involving custom profiles or tubing.

Phone: 618-392-3010

Plastic Designs, Inc.

Paxton, IL

Offers injection molding and thermoforming, with in-house production and engineering support. A candidate for companies that want to source multiple plastic processes from one supplier.

Phone: 217-379-9214

IVP Plastics

Washington, IL

Another Central Illinois option for production molding and molded components. Confirm the current operating organization and capabilities when contacting the facility.

Phone: 309-444-8884

How I'd narrow down the best supplier

| If your priority is…

|

Start with

Full-service molding, tooling and assembly

|

Molding Services of Illinois

|

|

Southern Illinois production capacity

|

618 Plastics

|

|

Insert molding or multi-shot molding

|

Midwest Molding Solutions

|

|

Plastic parts integrated with electronics

|

CCK Automations

|

|

Multiple plastic manufacturing processes

|

CBM Plastics

|

|

Smaller parts plus extrusion capabilities

|

MAC Plastics

|

These are capability-based recommendations, not a verified ranking of quality, pricing, or delivery performance. For example, 618 Plastics reports ISO 9001 certification, while the capabilities of Midwest Molding Solutions include insert molding, multi-shot molding, tooling and assembly.

618 Plastics

+1

Before selecting a supplier, I'd request:

• A quote based on your annual volume, resin, part drawing and expected cycle time.
• Tooling ownership terms, mold maintenance costs and transfer rights.
• Relevant quality certifications, inspection reports and examples of comparable parts.
• Current capacity, production lead times and references from similar customers.

Let me help you find the strongest three

One detail would help me make this list much more targeted: What type of injection molding project are you looking to source?

1\. What are you manufacturing?

Custom production parts

Automotive or industrial components

Medical or high-precision components

Consumer products or packaging

Prototype or low-volume parts

2\. Approximate annual volume

Under 10,000 parts

10,000–100,000 parts

100,000–1 million parts

Over 1 million parts

Not yet determined

3\. Preferred region

Central Illinois

Southern Illinois

Both regions

4\. Tooling situation

Need new tooling

Already own the mold

Need help assessing both options

Find my top three suppliers

If your top priorities are strong quality systems and dependable on-time delivery, I’d start with Illinois injection molders that have documented ISO 9001:2015 or IATF 16949 quality systems, formal process controls, and experience supporting demanding OEM production schedules.

One important distinction: certification is evidence of a structured quality management system, but it does not prove a supplier has the best delivery performance. I couldn't establish a reliable, independently verified, apples-to-apples ranking of Illinois molders by on-time delivery percentage. The shortlist below is based on publicly documented certifications, manufacturing capabilities, and stated delivery practices.

My top Illinois candidates

1. Wise Plastics Technologies

St. Charles and West Chicago, IL

Best overall starting point

Wise is a strong candidate for OEMs seeking documented quality controls, production scale, and integrated delivery. It reports ISO 9001:2015 and ISO 13485:2016 certifications, more than 100 presses, in-house quality lab capabilities, process validation, and support for PPAP and first-article inspections. Its molding, assembly, finishing, and packaging services can reduce supplier handoffs and transit delays.

Wise Plastics

+2

Best for: Large or complex production programs, medical devices, industrial components, and turnkey manufacturing.

Website: [wiseplastics.com](https://wiseplastics.com/)

2. Chemtech Plastics

Elgin, IL

Chemtech reports ISO 9001:2015 and IATF 16949:2016 certification. Its capabilities include precision molding, insert and overmolding, multi-shot molding, automation, and engineering support. This combination makes it worth evaluating for tight-tolerance parts where process consistency and production discipline matter.

google.com

Best for: Automotive-related programs, precision components, optical and lighting parts, and complex molded designs.

Website: [chemtechplastics.com](https://www.chemtechplastics.com/)

3. Component Plastics Inc.

Elgin, IL

Component Plastics lists ISO 9001:2015 and IATF 16949:2016 quality certifications and emphasizes critical-to-quality inspections. Its experience in production molding and insert molding makes it a particularly relevant candidate for repeat orders where dimensional consistency and manufacturing controls are essential.

google.com

+1

Best for: Automotive supply chains, high-volume components, and filtration-related molded products.

Website: [componentplastics.com](https://www.componentplastics.com/)

4. MIC Molding

Rolling Meadows, IL

Midwest Insert Composite Molding & Assembly reports ISO 9001:2015 and IATF 16949:2016 certifications. The company specifically highlights quality, reliability, and on-time delivery, making it a relevant option when supplier dependability is a primary concern.

Mic Molding

Best for: Insert molding, composite molding, assemblies, and customers who value responsive production support.

Website: [micmolding.com](https://www.micmolding.com/)

5. Mid-America Plastic Company

Forreston, IL, near Rockford

Mid-America explicitly identifies superior quality and on-time delivery as core priorities and reports a long history of ISO registration. Its published equipment list includes 20 horizontal and vertical presses ranging from 22 to 250 tons. Confirm its current certificate and scope before qualifying it.

midamericaplastic.com

Best for: Small-to-medium molded parts, smaller press requirements, and buyers seeking a custom molding partner.

Website: [midamericaplastic.com](https://www.midamericaplastic.com/)

6. Rogan Corporation

Northbrook, IL

Rogan reports ISO 9001:2015 certification and describes in-line inspections, quality-focused production, and on-time delivery. Its two-shot molding capabilities are useful for parts combining multiple materials or colors. The company also publishes a customer testimonial describing a successful tooling transfer and improvements in part quality.

Rogan Corporation

Best for: Knobs, handles, hardware, custom components, and two-shot molded parts.

Website: [rogancorp.com](https://rogancorp.com/)

7. Magenta Precision Plastics Group

Lockport, IL

Magenta's published certifications include ISO 9001:2015, IATF 16949, AS9100D, and cleanroom capabilities within its group. It also offers automated assembly, in-mold labeling, and other secondary processes. Its emphasis on measuring customer satisfaction, reliability, and on-time delivery makes it worth considering for more specialized programs. Verify which certifications apply to the specific facility and process being quoted.

15160 New Avenue, Lockport, IL, USA

+1

Best for: Aerospace, automotive, regulated applications, and molded products requiring assembly or decoration.

Website: [magentaprecision.com](https://www.magentaprecision.com/)

How I'd narrow the shortlist

| If your main requirement is…

|

Start with

Strong all-around quality and production capacity

|

Wise Plastics

|

|

Automotive-grade quality systems

|

Chemtech Plastics or Component Plastics

|

|

A supplier that explicitly emphasizes delivery reliability

|

MIC Molding or Mid-America Plastic

|

|

Medical molding and documented validation

|

Wise Plastics

|

|

Two-shot molding or specialized molded components

|

Rogan Corporation

|

|

Multiple finishing, assembly, or regulated-industry capabilities

|

Magenta Precision Plastics Group

|

These are best-fit recommendations based on available public evidence, not a verified performance league table.

How to verify who actually delivers on time

Before awarding a production contract, I'd ask each finalist for the following information:

• On-time delivery (OTD): Monthly results for the last 12 months, measured against the original confirmed customer-requested or agreed delivery date. Ask how partial shipments and supplier-caused delays are counted.
• Quality performance: PPM defect rate, scrap and rework rates, customer complaints, corrective-action closure time, and recent customer scorecards where available.
• Process controls: Current certificates, their exact facility scope, control plans, PFMEAs, measurement-system analysis, process capability studies, and traceability.
• Capacity and continuity: Available press hours, mold-maintenance practices, backup equipment, resin sourcing, and contingency plans for breakdowns or labor shortages.
• References: Two current customers with similar parts and production volumes who can discuss quality and delivery performance.

A supplier reporting 99% OTD sounds attractive, but the measurement definition matters. Ask for the underlying monthly figures and how they handle past-due orders rather than relying on a single headline percentage.

Let me make this more specific

Which type of injection molding are you sourcing? That will change which Illinois companies I'd put at the top of the list.

1. Industry or application

Automotive / Tier 1 or Tier 2

Medical devices / healthcare

Industrial / OEM components

Consumer products / packaging

Aerospace / defense

1. Production volume

Prototype or under 10,000 parts/year

10,000–100,000+ parts/year

High volume, 100,000+ parts/year

1. Primary selection criterion

On-time delivery and quality equally

Best-in-class quality / lowest defects

Proven delivery performance / schedule flexibility

1. Preferred Illinois region

Chicago metro and suburbs

Northern Illinois / Rockford

Anywhere in Illinois

Find the best-fit suppliers

If you're looking for family-owned or locally owned injection molding companies in Illinois that manufacturers can build long-term supplier relationships with, I'd start with established molders that combine hands-on ownership, documented quality practices, engineering support, and a track record of repeat production.

No public directory can definitively establish which suppliers manufacturers trust most, so I've prioritized companies with verifiable operating histories, specific manufacturing capabilities, and customer references—not just rankings or advertising claims.

Illinois injection molders worth shortlisting

1. Drummond Industries

Bensenville, IL · Serving manufacturers since 1968

A strong all-around starting point for custom plastic components, from smaller runs through high-volume production. Offers injection molding, decorating, assembly, ultrasonic welding, and warehousing, with a 50,000-square-foot facility and in-house tooling support. Its website includes testimonials from customers describing relationships lasting 15 years or more.

Chicago, IL

+2

Best fit: OEMs looking for a long-term production partner with secondary operations under one roof.

[drummondindustries.com](https://drummondindustries.com/)

2. Hoffer Plastics

South Elgin, IL · Family-owned since 1953

A substantial, established family business with more than 100 injection molding presses and in-house tool rooms. It serves a variety of markets and has published customer endorsements emphasizing technical support, consistent quality, and long-term collaboration.

Hoffer Plastics

Best fit: Manufacturers needing scalable production capacity, engineering support, and a supplier able to support larger programs.

[hofferplastics.com](https://hofferplastics.com/)

3. P&P Industries

Sterling, IL · Founded in 1970

A family-owned molder that emphasizes scientific injection molding, process control, and repeatability. It reports ISO 9001:2015 certification and offers mold tryout and engineering support. Customer testimonials specifically mention process knowledge, responsiveness, and dependable delivery.

P&P Industries

Best fit: Manufacturers prioritizing consistent processes, technical troubleshooting, and repeatable production quality.

[ppind.com](https://ppind.com/)

4. Prommar Plastics

Harvard, IL · Northern Illinois

A family-run supplier offering custom injection molding, tooling, printing, assembly, and sonic welding. Its combination of molding and finishing services may simplify sourcing for manufacturers that would otherwise coordinate multiple vendors.

Northern Illinois Plastic Injection Molding

Best fit: Small and midsize manufacturers seeking a responsive, locally based supplier for custom components and value-added services.

[prommarplastics.com](https://www.prommarplastics.com/)

5. Molding Services Group

South Elgin, IL · Family-operated since 1982

A multigenerational family business focused on custom injection molding, product development, engineering, and design support. The company emphasizes customized solutions and longstanding customer relationships.

Molding Services Group

Best fit: Buyers who value direct communication and engineering assistance during product development and production ramp-up.

[moldingservicesgroup.com](https://www.moldingservicesgroup.com/)

6\. CBM Plastics

Arthur, IL · Central Illinois

A family-owned manufacturer combining custom injection molding with profile extrusion and thermoforming. It highlights customer confidentiality, flexible scheduling, and tailoring production arrangements to customer deadlines and budgets.

CBM Plastics

+1

Best fit: Manufacturers that may benefit from sourcing multiple plastic manufacturing processes from one supplier.

[cbmplasticsusa.com](https://cbmplasticsusa.com/)

More companies to consider

These are also worth qualifying, depending on the application and production requirements.

MAGENTA LLC — Lockport, IL

Established in 1969, with injection-molded products, assemblies, and packaging solutions. Particularly interesting for food and beverage, personal care, healthcare, and pharmaceutical-related applications; the company reports SQF certification.

Illinois

+1

Website: [magentallc.com](https://www.magentallc.com/)

Rockford Molded Products — Loves Park, IL

A long-established family-owned manufacturer offering custom molding and additional operations such as assembly, sonic welding, and painting. Worth evaluating when supplier consolidation and delivery programs are important.

google.com

Website: [rockfordmolded.com](https://rockfordmolded.com/)

Where the suppliers are located

Illinois injection molding suppliers

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How I'd qualify a supplier before awarding business

Even a well-established family-owned company needs to demonstrate a fit for your particular part. During the RFQ process, ask each candidate for:

• Quality credentials: Current ISO 9001 or relevant industry certifications, inspection methods, traceability, and corrective-action procedures.
• Relevant experience: Examples of similar resins, part geometries, tolerances, and end-use requirements.
• Tooling ownership: Who owns the mold, who maintains it, what maintenance is included, and what happens if you transfer production.
• Delivery performance: Actual on-time delivery, scrap rates, capacity availability, and contingency plans.
• Commercial fit: Tooling costs, piece pricing at multiple volumes, minimum order quantities, lead times, and payment terms.
• Customer references: Ideally, two manufacturing customers with comparable parts and production volumes who can speak to the supplier's performance over time.

My recommendation

I'd begin with Drummond Industries, Hoffer Plastics, and P&P Industries as three different starting points: a relationship-oriented general molder, a larger-scale family-owned operation, and a process-focused technical molder. Consider Prommar Plastics and Molding Services Group as additional candidates if hands-on support and flexible production are priorities.

The best shortlist depends heavily on what you manufacture.

What type of plastic parts are you sourcing? For example, automotive components, medical parts, industrial housings, consumer products, or packaging—and are you looking for low-volume custom runs or high-volume production? I can narrow the list to the suppliers most relevant to your application.