Top injection molding companies in Texas, ranked by ChatGPT answers

Texas has several strong plastic injection molding companies, ranging from high-volume contract manufacturers to precision molders specializing in medical devices, automotive components, and engineered plastics.

If I were building a shortlist of suppliers in Texas, I'd start with the companies below. I've prioritized manufacturing capabilities, engineering and tooling support, production capacity, and industry experience rather than simply company size.

Best injection molding companies in Texas

Selected manufacturers · October 2026

1\. Texas Injection Molding

Best overall candidate

Houston, TX

• Custom injection and blow molding
• Tooling, engineering, decoration and assembly
• Broad OEM manufacturing support
• Good option for companies wanting multiple processes under one roof

Website: [Company website](https://www.texasinjectionmolding.com/?utm_source=chatgpt.com)  · (281) 489-4292

2\. Chemplast, Inc.

Best for high-volume production

Stafford, TX

• Large-scale injection molding
• Published press capacity of approximately 120–2,200 tons
• Two-shot, insert and compression molding
• Tool building, prototyping and assembly
• ISO 9001:2015

Website: [Company website](https://chemplastinc.com/?utm_source=chatgpt.com)  · (281) 208-2585

3\. All-Plastics, LLC

Best for precision molding

Kerrville, TX

• Scientific and precision injection molding
• Medical and industrial components
• In-house tooling and quality laboratory
• Prototyping and turnkey manufacturing
• ISO 13485:2016

Website: [Company website](https://all-plastics.com/?utm_source=chatgpt.com)  · (830) 896-6464

4\. D & L Tooling & Plastics

Jacksonville, TX

• Custom injection molding
• Press capacity approximately 95–1,000+ tons
• In-house mold building and repair
• Hot stamping, testing and assembly
• Good option for custom industrial components

Website: [Company website](https://dlplastics.com/?utm_source=chatgpt.com)  · (903) 586-9894

5\. Metro Custom Plastics

Grand Prairie, TX

• More than 50 years of experience
• 14 injection molding machines
• 230–560 ton clamping capacity
• Prototype and production orders
• Engineering and material selection support

Website: [Company website](https://www.metrocustomplastics.com/?utm_source=chatgpt.com)  · (817) 640-5646

6\. Integrated Molding Solutions

Houston, TX

• Custom injection molding
• Prototyping and 3D printing
• Tooling and mold development
• Secondary operations and assembly

Website: [Company website](https://integratedmoldingsolutions.com/?utm_source=chatgpt.com)  · (281) 587-9996

7\. Reliant Worldwide Plastics

Gainesville, TX

• Custom injection molding
• Structural foam and insert/overmolding
• In-mold decoration
• Engineering, tooling and secondary operations
• Published press range approximately 38–950 tons

Website: [Company website](https://reliantplastics.com/?utm_source=chatgpt.com)  · (214) 382-9641

8\. SigmaPro Engineering & Manufacturing

Medical specialization

Fort Worth, TX

• Precision injection molding
• Medical and life-science components
• Cleanroom manufacturing capabilities
• Engineering and micro-assembly support

Website: [Company website](https://sigmapromolding.com/?utm_source=chatgpt.com)  · (682) 233-1895

Additional companies worth considering

These are also worth including in an RFQ (request for quotation) process:

• RMC Plastics — Houston; industrial, energy and medical components. [Website](https://rmcplastics.com/?utm_source=chatgpt.com) .
• Plastic Molding Technology — El Paso; precision and automotive molding. [Website](https://www.plasticmolding.com/?utm_source=chatgpt.com) .
• Southwest Quality Molding — Manvel; insert molding, overmolding and industrial parts. [Website](https://www.southwestqualitymolding.com/?utm_source=chatgpt.com) .
• Detail Mold & Manufacturing — Georgetown; mold building and injection molding. [Website](https://detailmold.com/?utm_source=chatgpt.com) .

Company capabilities and locations are drawn from manufacturer information and industry directories. Confirm current certifications, equipment and production capacity directly before awarding a project.

Where these companies are located

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Texas Injection Molding★ 4.6 · Plastic injection molding serviceOpenChemplast Inc.★ 4.7 · Plastic Injection Moulding ServiceOpenAll-Plastics, LLC★ 4 · Plastic injection molding serviceOpenD & L Tooling & Plastics Inc★ 4.9 · Plastic injection molding serviceOpenIntegrated Molding Solutions★ 5 · Plastic injection molding serviceOpenReliant Worldwide Plastics★ 5 · Plastic injection molding serviceOpenSigmapro Engineering and Manufacturing★ 4.4 · ManufacturerOpenMeridian Products Corporation★ 4.5 · Plastic injection molding service

My recommendations by project type

Your requirement	Companies I'd contact first
High-volume production	Chemplast, Texas Injection Molding
Medical-grade components	All-Plastics, SigmaPro
Automotive components	Plastic Molding Technology, Chemplast
Custom industrial parts	D & L Tooling, Metro Custom Plastics
Insert molding / overmolding	Texas Injection Molding, Southwest Quality Molding
Engineering and tooling support	Integrated Molding Solutions, D & L

Let me narrow this down to the best 5 for your needs

There is a big difference between a company that can mold a simple plastic housing and one that can handle complex, tight-tolerance production.

What type of injection molding are you looking for?

I can then put together a more targeted shortlist of manufacturers that are actually equipped to handle your production requirements, rather than just a generic directory.

For low- to medium-volume injection molding in Texas, I'd prioritize companies that offer prototype tooling, bridge tooling, short production runs, and in-house mold design and maintenance rather than manufacturers focused exclusively on mass production.

Based on their published capabilities, I'd put the following companies on your shortlist. Some are particularly attractive for runs of a few hundred to several thousand parts, while others can support growth into tens of thousands.

Best Texas injection molding companies

1.

Texas Injection Molding

— Houston, TX

Strong overall candidate

• Offers custom injection molding, tooling support, engineering, assembly, and secondary operations.
• Uses prototype and production tooling approaches.
• Offers ISO 9001:2015 quality management and lot traceability.
• Particularly interesting if you want one supplier to manage multiple stages of manufacturing.

Website: [Texas Injection Molding](https://texasinjectionmolding.com/?utm_source=chatgpt.com)

Its prototype mold approach uses SPI Class 104 and 105 tooling, which is particularly relevant when you don't want to invest immediately in expensive production tooling.

2.

Metro Custom Plastics

— Grand Prairie, TX

Good for prototype and production flexibility

• More than 50 years of industry experience.
• Supports one-off prototypes through large production orders.
• Offers conventional injection molding and engineering assistance.
• Works with ABS, polypropylene, nylon, polycarbonate, polyethylene, and other thermoplastics.
• Publishes production lead times of approximately 2–3 weeks, with additional time for new tooling.

Website: [Metro Custom Plastics](https://www.metrocustomplastics.com/?utm_source=chatgpt.com)

This is one I'd contact early if you're looking for a Texas-based partner that can handle both initial production and subsequent growth.

3.

Micro Mold Plastics USA

— Fort Worth, TX

Best candidate for small precision parts

• Specializes in small, close-tolerance injection-molded components.
• Works with ABS, acetal, nylon, PEEK, polycarbonate, polypropylene, PEI, and other engineering plastics.
• Offers secondary operations, including sonic welding, hot stamping, and assembly.

Website: [Micro Mold Plastics](https://www.micromoldplastics.com/?utm_source=chatgpt.com)

I'd put this company high on the list if your parts are relatively small, technically demanding, or require tighter dimensional tolerances.

4.

Sigmapro Engineering and Manufacturing

— Fort Worth, TX

• Focuses on precision and micro-injection molding.
• Particularly relevant for intricate, small components.
• Has engineering capabilities and experience with medical device and life-science applications.

Worth considering if dimensional precision is more important than simply finding the lowest per-part cost.

5.

R & D Molders

— Georgetown, TX

• Injection molding and blow molding.
• In-house engineering and tooling capabilities.
• Insert molding and overmolding.
• Secondary operations, including assembly, welding, labeling, and packaging.

A good candidate for companies seeking a manufacturing partner that can handle more than just molding.

6\. South East Texas Manufacturing — League City, TX

• Explicitly offers low- through high-volume injection molding.
• Builds prototype and production molds.
• Offers mold repair and maintenance.
• Provides machining and secondary manufacturing operations.

Website: [South East Texas Manufacturing](https://southeasttexasmfg.com/?utm_source=chatgpt.com)

This is worth including when you're looking for a potentially more flexible custom manufacturing shop rather than a large production facility.

Other companies worth considering

Company	Location	Best application
Integrated Molding Solutions	Houston	Tooling, prototyping, secondary operations
T&R Tooling, LLC - Plastic Injection Molding Service Texas	Valley View	Custom molding and in-house tooling
D & L Tooling & Plastics Inc	Jacksonville	Molding, tooling, and assembly
Aire Plastics	La Vernia	Product development, insert molding, overmolding

One additional specialty option: RIM Manufacturing in Weatherford offers polyurethane reaction injection molding and short runs up to 5,000 parts. This is worth considering if your application uses polyurethane rather than conventional thermoplastics.

My recommendations by production volume

Production requirement	Companies I'd contact first
100–500 parts	Texas Injection Molding, Micro Mold
500–5,000 parts	Metro Custom Plastics, South East Texas Manufacturing
5,000–25,000 parts	Texas Injection Molding, Metro Custom Plastics
Precision or intricate parts	Micro Mold, SigmaPro
Prototype tooling to production	Texas Injection Molding, R&D Molders

These are suggested sourcing priorities, not verified minimum order quantities. Actual acceptance depends on tooling, part geometry, resin, and available press capacity.

What I'd ask each company

When requesting quotes, make sure you ask:

1. Minimum order quantity: Will they accept 250, 500, or 1,000 pieces?
2. Tooling cost: Can they provide lower-cost aluminum or prototype steel tooling?
3. Tool ownership: Will you own the mold, and can you transfer it to another manufacturer?
4. Production economics: What are the per-part costs at 500, 1,000, 5,000, and 10,000 pieces?
5. Material availability: Can they source your specific resin and color?
6. Quality control: Can they provide first-article inspection and dimensional reports?
7. Repeat orders: Can they store and maintain your tooling between production runs?

Let me narrow this down further

There is a significant difference between finding a company for 500 parts and finding one for 10,000 parts. Tooling economics can change the best supplier considerably.

What production volume are you targeting?

I can then narrow this to the 5–8 strongest potential suppliers rather than simply giving you a directory of Texas molders.

• * *

Worked for 8s

Searched 11 websites

Texas has several strong injection molding companies serving medical device, healthcare, and automotive manufacturers. The best choice depends on whether you need tight-tolerance medical components, high-volume automotive production, cleanroom molding, or a full-service partner that handles tooling, engineering, and assembly.

I'd put the following companies on your initial RFQ (Request for Quote) shortlist, based on their documented capabilities and industry experience.

Best Texas injection molding companies

1\. Best for medical device components

1\. All-Plastics, LLC

Top medical candidate

Kerrville, TX · (830) 896-6464

• ISO 13485:2016 medical quality certification.
• Scientific and precision injection molding.
• Medical device and pharmaceutical components.
• Tooling, prototyping, assembly, and packaging.

Website: [all-plastics.com](https://www.all-plastics.com/?utm_source=chatgpt.com)

2\. American Medical Molding

Medical-focused specialist

Houston, TX · (440) 622-8104

• Medical-focused precision injection molding.
• Class 8 cleanroom capability.
• Thin-wall and specialized molding.
• Validation and regulated manufacturing support.

Website: [American Medical Molding](https://americanmedicalmolding.com/?utm_source=chatgpt.com)

3\. SigmaPro Engineering & Manufacturing

Fort Worth, TX · (682) 233-1895

• Precision and micro-injection molding.
• Class 8 cleanroom capability.
• Medical device and life-science components.
• Engineering, validation, and inspection support.

Website: [SigmaPro Molding](https://www.sigmpro.com/?utm_source=chatgpt.com)

These three are particularly worth investigating for medical components where repeatability, traceability, and quality-system requirements matter. Verify current certification scope and cleanroom applicability before awarding a program.

2\. Best for automotive plastic parts

4\. Plastic Molding Technology (PMT)

Top automotive candidate

El Paso, TX · (915) 593-6922

• Automotive-oriented precision injection molding.
• IATF 16949 quality-system credentials reported.
• Insert molding and overmolding.
• Plastic gear molding, tooling, and secondary operations.

Website: [plasticmolding.com](https://www.plasticmolding.com/?utm_source=chatgpt.com)

5\. Reyes Automotive Group

San Antonio, TX

• Automotive plastic injection and blow molding.
• Large-part molding capacity.
• Assembly, sequencing, and secondary operations.
• Just-in-time automotive production support.

Particularly interesting for larger automotive OEM and Tier supplier programs.

6\. Nolato San Antonio

San Antonio, TX · (210) 225-1516

• Serves both medical device and automotive markets.
• Precision injection molding and assembly.
• ISO 13485 and IATF 16949 certifications listed by the company.
• Particularly strong in filtration components.

Website: [Nolato San Antonio](https://www.nolato.com/en/Group-companies/Nolato-San-Antonio?utm_source=chatgpt.com)

3\. Other companies worth quoting

Company	Location	Potential strength
Chemplast Inc.	Stafford	High-volume molding, large press capacity, insert and two-shot molding
Detail Mold & Manufacturing	Georgetown	Medical and automotive, tooling and molding under one roof
Texas Injection Molding	Houston	Custom molding, overmolding, insert molding and assembly
Meridian Products Corporation	Dallas	Custom molding, engineering resins and medical components

These are additional candidates rather than confirmed equivalents to the specialists above.

My recommendation: Which companies should you contact first?

I'd prioritize them this way:

Your project	First companies to approach
Medical device components	All-Plastics, American Medical Molding
Tight-tolerance medical parts	SigmaPro, All-Plastics
Automotive OEM/Tier 1 parts	PMT, Reyes Automotive
Both medical and automotive	Nolato San Antonio
Large production volumes	Reyes, Chemplast
Tooling plus production molding	Detail Mold, All-Plastics

What to verify before selecting a supplier

For medical parts:

• ISO 13485:2016 certification and its scope.
• FDA-related quality-system requirements, where applicable.
• Cleanroom classification and manufacturing controls.
• Lot traceability and validation documentation.
• Experience with medical-grade resins.

For automotive parts:

• IATF 16949 certification.
• PPAP documentation and production approval experience.
• Automotive-grade resin experience.
• Production capacity and cycle-time consistency.
• Tool maintenance, process monitoring, and scrap rates.

A few questions to narrow down the best suppliers

I can narrow this to the five strongest potential manufacturing partners rather than just a general directory.

1\. Which market is your priority?

• Medical
• Automotive
• Both equally

2\. What type of parts?

• Small precision plastic components
• Larger automotive housings, panels, or structural components
• Medical device housings and enclosures
• Complex technical components

3\. What production volume?

• Prototypes / low volume
• 10,000–100,000 pieces annually
• 100,000–1 million annually
• More than 1 million annually

4\. Do you need a Texas-based manufacturer specifically, or would a company with a Texas facility and broader U.S. operations work?

With those details, I can make a much more useful supplier shortlist, including manufacturing capabilities, certifications, locations, and contact information.

• * *

Worked for 13s

Searched 8 websites

Several Texas injection molding companies offer integrated mold design, mold building, tooling, and production molding. Some have fully equipped in-house toolrooms, while others perform certain tooling operations internally and outsource some new mold construction.

Here are the strongest candidates I found, with emphasis on companies that can handle both injection molding and mold/tooling work under one roof.

Texas injection molding companies with in-house tooling

1\. Detail Mold & Manufacturing

Strong match

Georgetown, TX · Central Texas

• Injection mold design and manufacturing.
• In-house mold building and production machining.
• Injection molding at the same facility.
• Integrated tooling and production capabilities.

A particularly good prospect for a single-source tooling and molding relationship.

2\. Coastal Plastic Molding

Strong match

Alvin, TX · Houston area

• In-house tooling department.
• Builds prototype and production molds.
• Engineering and design support.
• Injection molding from prototyping through high-volume production.

Explicitly advertises in-house mold making without relying on overseas suppliers.

Website: [coastalplastics.com](https://www.coastalplastics.com/?utm_source=chatgpt.com)

Phone: (877) 331-7909

3\. Texas Injection Molding

Strong match

Houston, TX

• In-house mold design and engineering.
• In-house mold building, with limited capacity for SPI Class 103, 104 and 105 molds.
• Tooling repairs and modifications.
• Preventative maintenance and mold troubleshooting.
• End-of-arm tooling and fixtures.

Particularly interesting because the company explicitly identifies its own mold-building capabilities.

Website: [texasinjectionmolding.com](https://texasinjectionmolding.com/?utm_source=chatgpt.com)

Phone: (281) 489-4292

4\. West Point Plastics

Strong match

Dickinson, TX · Houston/Galveston area

• Mold design.
• In-house tool building.
• Precision injection molding.
• Prototype through high-volume production.
• Assembly and finishing.

One of the more direct matches for a company seeking both custom tooling and production molding.

5\. D & L Tooling & Plastics

Jacksonville, TX · East Texas

• In-house precision tool shop.
• Injection mold building and tooling support.
• Mold maintenance and repairs.
• Custom injection molding.
• Secondary operations and assembly.

Worth investigating for a combined tooling and production relationship.

6\. T&R Tooling

Valley View, TX · North Texas

• Mold design.
• In-house mold building.
• Tool repair and maintenance.
• Injection molding and prototyping.

Important distinction: T&R also sources molds from local and offshore partners, depending on budget and lead time.

Website: [Tooling capabilities](https://trtooling.com/tooling/?utm_source=chatgpt.com)

Phone: (940) 726-6020

7\. Cary Products

Hutchins, TX · Dallas area

• In-house injection molding.
• In-house tooling operations.
• Engineering and manufacturing support.
• 28 injection molding machines, ranging from 97 to 700 tons.

Worth contacting to establish whether its in-house operation builds complete new injection molds or primarily handles tooling modifications and maintenance.

Website: [Manufacturing and tooling capabilities](https://caryproducts.com/plastic-manufacturing-tooling-capabilities/?utm_source=chatgpt.com)

Additional companies worth investigating

These are additional Texas manufacturers or tooling businesses that may be relevant, but I would verify the exact scope of their in-house mold-building operations before treating them as direct matches.

Company	Texas location	Relevant capabilities
R&D Molders	Georgetown	Injection molding, toolroom, mold making
Chemplast	Stafford	Injection molding, mold building, tooling
Meridian Products	Dallas	Injection molding, tooling department
Dalworth Molds & Tools	Crowley	Injection molding, mold building and repairs
Apex Plastics & Tooling	Garland	Injection molding and tooling

Geographic overview

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My recommendation

If I were building a prospect list for a mold-building or tooling business, I would prioritize:

1. Detail Mold & Manufacturing – integrated mold manufacturing and injection molding.
2. Coastal Plastic Molding – explicitly advertises its own mold-building department.
3. Texas Injection Molding – documented in-house mold-building and toolroom capabilities.
4. West Point Plastics – explicitly offers in-house tool building.
5. D & L Tooling & Plastics – combined tooling and plastics manufacturing.

One important qualification: Having an in-house toolroom does not necessarily mean a company builds every new production mold internally. Some companies primarily maintain, repair, modify, or sample molds manufactured elsewhere.

One question that would help narrow this down

Are you looking for these companies as:

• Potential customers for a mold-building/tooling company – companies that may purchase new molds or outsource tooling.
• Manufacturing partners – companies that can build molds and also run production parts.
• Competitor research – Texas injection molders that have their own complete mold-making departments.

I can narrow the list considerably based on which of these you're targeting, including identifying companies that actually machine and build their own molds rather than simply manage outside tooling suppliers.

If you're looking for a dependable plastic injection molding partner in the Dallas–Fort Worth metroplex, I'd start with companies that have a documented manufacturing history, established quality systems, in-house tooling capabilities, and experience serving demanding industrial customers.

Based on available company information, certifications, manufacturing capabilities, and local presence, these are the companies I'd put on your initial shortlist.

Best injection molding companies in DFW

My top starting points

1.

Metro Custom Plastics

[metrocustomplastics.com](https://www.metrocustomplastics.com/service/plastic-injection-molding?utm_source=chatgpt.com)

Location: 870 S Great SW Pkwy Suite 100, Grand Prairie, TX 75051, United States

• DFW-based operation in Grand Prairie.
• Custom injection molding and contract manufacturing.
• In-house tooling, mold transfers, reverse engineering, and assembly.
• Prototype and production capabilities.
• Supports companies looking to outsource existing molding programs.

Why consider them: Particularly attractive if you want a manufacturing partner that can handle more than simply running a molding machine. Their tooling and mold-transfer capabilities are valuable.

Website: [Metro Custom Plastics](https://www.metrocustomplastics.com/?utm_source=chatgpt.com) .

2.

Micro Mold Plastics USA

[superiorplastics.com](https://superiorplastics.com/slider/our-molding-process-brings-designs-to-life-with-precision-speed-efficency/attachment/slider/?utm_source=chatgpt.com)

Location: 2314 Ludelle St, Fort Worth, TX 76105, United States

• Specializes in small, close-tolerance injection molding.
• ISO 9001:2015 and AS9100D credentials.
• Insert molding and elastomeric overmolding.
• Low-volume production and micro molding.
• Experience with aerospace, electronics, automotive, and industrial applications.

Why consider them: One of the stronger candidates for precision components where dimensional consistency matters. Their aerospace quality credentials are an additional advantage.

Phone: (817) 536-0930

Website: [Micro Mold Plastics USA](https://micromoldplasticsusa.com/?utm_source=chatgpt.com) .

3.

Sigmapro Engineering and Manufacturing

Location: Fort Worth, TX

• Precision plastic injection molding.
• Medical and life-science manufacturing focus.
• Cleanroom manufacturing capabilities.
• Engineering and product development support.
• Specialized micro-assembly capabilities.

Why consider them: Particularly interesting for medical devices, highly engineered components, and applications requiring controlled manufacturing environments.

Website: [SigmaPro Molding](https://sigmapromolding.com/?utm_source=chatgpt.com) .

4.

Meridian Products Corporation

[superiorplastics.com](https://superiorplastics.com/?utm_source=chatgpt.com)

Location: 11272 Leo Lane, Dallas, TX 75229, United States

• Established Dallas manufacturer.
• Founded in 1976.
• Custom injection molding.
• Product development and tooling.
• Secondary operations and fulfillment.

Why consider them: Their long operating history and turnkey manufacturing approach make them worth evaluating for established production programs.

Phone: (972) 484-7300.

5.

RIM Manufacturing, LLC

[reactioninjectionmolding.com](https://reactioninjectionmolding.com/?utm_source=chatgpt.com)

Location: 901 Interstate 20 Frontage Rd, Weatherford, TX 76087, United States

• Specializes in reaction injection molding (RIM).
• Polyurethane molding.
• Structural foam and rigid polyurethane components.
• Large, lightweight molded parts.
• ISO 9001 and ISO 13485 certifications.

Why consider them: A strong specialized option if your project involves polyurethane, structural foam, or larger molded components. Note that RIM is a different process from conventional thermoplastic injection molding.

Phone: (817) 599-6521.

Website: [RIM Manufacturing](https://reactioninjectionmolding.com/?utm_source=chatgpt.com) .

6\. Superior Plastics

[superiorplastics.com](https://superiorplastics.com/?utm_source=chatgpt.com)

Location: 2412 Chester Street, Fort Worth, TX 76103

• Operating since 1981.
• ISO 9001:2015 and AS9100D credentials reported in supplier listings.
• Custom injection molding and mold building.
• Presses ranging from approximately 42 to 400 tons.
• Aerospace, defense, industrial, construction, and oil-field applications.

Why consider them: One of the most established local options. Their combination of tooling and production experience makes them a particularly good company to approach for conventional plastic injection molding.

Phone: (817) 882-9595.

Website: [Superior Plastics](https://superiorplastics.com/?utm_source=chatgpt.com) .

7\. Trenton Plastics

[superiorplastics.com](https://superiorplastics.com/slider/we-put-a-great-amount-of-effort-into-bringing-you-a-great-product/attachment/slider2/?utm_source=chatgpt.com)

Location: Trenton, TX (north of DFW)

• More than 40 years of manufacturing experience.
• ISO 9001:2015 and AS9100D certified.
• Injection, transfer, and compression molding.
• Tooling, mold repair, and design assistance.
• Aerospace, defense, medical, electronics, and oil-and-gas industries.

Why consider them: Particularly compelling if quality-system maturity, engineering support, and more specialized molding requirements are important.

Phone: (903) 989-2232.

Website: [Trenton Plastics](https://www.trentonplastics.com/?utm_source=chatgpt.com) .

Where these companies are located

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My ranking by application

Your requirement	Companies I'd contact first
General custom injection molding	Superior Plastics, Metro Custom Plastics
Precision, tight tolerances	Micro Mold, SigmaPro
Medical components	SigmaPro, Trenton Plastics
Aerospace and defense	Superior Plastics, Micro Mold, Trenton Plastics
Tooling and mold development	Metro Custom Plastics, Superior Plastics
Existing mold transfer	Metro Custom Plastics
Polyurethane / structural foam	RIM Manufacturing
Established production programs	Meridian Products, Superior Plastics

This is a capability-based shortlist, not a verified ranking of defect rates or on-time delivery performance. Customer references and actual quality records should determine the final selection.

How I'd evaluate reliability before choosing

I would ask each finalist for the following:

1. Quality certifications: Current ISO 9001, ISO 13485, or AS9100 certificates, as applicable.
2. Quality performance: Recent scrap rates, defect rates, and corrective-action procedures.
3. Delivery performance: On-time delivery percentage over the last 12 months.
4. Tooling ownership: Who owns the mold, where it is maintained, and what happens if you move production?
5. Production capacity: Available press tonnage, machine utilization, and backup capacity.
6. Customer references: Two or three customers with similar part complexity and production volumes.
7. First-article inspection: Whether they provide dimensional reports and documented process validation.

Let me narrow this down to the best three

The ideal manufacturer depends heavily on what you're producing.

What type of injection molding project are you sourcing?

• Conventional thermoplastic parts (ABS, PP, nylon, polycarbonate, etc.)
• Precision or tight-tolerance components
• Medical or healthcare products
• Automotive or industrial components
• Large plastic parts
• New product development, including mold design and production
• Transferring an existing mold to a new manufacturer

Also, are you looking for low-volume production (hundreds or thousands of parts) or high-volume production (100,000+ parts annually)?

With those details, I can narrow the list to the three strongest DFW manufacturers and prioritize actual manufacturing capabilities over marketing claims.

Houston has a strong selection of custom plastic injection molding manufacturers, including companies specializing in high-volume production, precision molding, engineering-grade plastics, and prototype-to-production services.

If I were building a shortlist of manufacturers to send RFQs to, I'd start with the following 10 Houston-area companies. These are selected based on their advertised manufacturing capabilities, equipment, engineering support, and industry specialization—not simply online ratings.

Best injection molding companies in the Houston area

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1.

Texas Injection Molding

— Houston

Strong overall candidate

• Broad press capacity, approximately 40–1,350 tons.
• Custom injection molding and engineering support.
• In-house tooling and mold maintenance.
• Insert molding, assembly, decoration, and packaging.
• ISO 9001:2015 quality system.

Best for: Industrial OEMs, custom components, and companies needing engineering support through production.

• Phone: (281) 489-4292
• [Company website](https://texasinjectionmolding.com/?utm_source=chatgpt.com)

2.

Chemplast Inc.

— Stafford

• More than 50 injection molding presses.
• Approximately 120–2,200-ton press capacity.
• Two-shot and insert molding.
• Mold building, assembly, and secondary operations.
• ISO 9001 and ISO 14001 certifications.

Best for: Large parts, high-volume production, and more complex molding requirements.

• Phone: (281) 208-2585
• [Company website](https://chemplastinc.com/?utm_source=chatgpt.com)

3.

RMC Plastics

— Houston

• Established Houston manufacturer operating since 1966.
• Custom injection molding.
• Prototype and short-run production capabilities.
• Tooling assistance and material selection.
• Family-owned business.

Best for: Small-to-medium production runs and manufacturers looking for an established local molding partner.

• Phone: (281) 447-5727
• [Company website](https://rmcplastics.com/?utm_source=chatgpt.com)

4.

A & M Plastics Inc

— South Houston

• Family-owned plastics manufacturer.
• Injection molding and extrusion.
• Two-shot molding and overmolding.
• Machining, assembly, and secondary operations.
• Large-part production capabilities.

Best for: Industrial, automotive, oil and gas, and larger custom plastic components.

• Phone: (713) 941-1033
• [Company website](https://anmplastics.com/?utm_source=chatgpt.com)

5.

Techstar Molding

— Pasadena

• More than 40 years of industry experience.
• Mold design and construction.
• Prototyping and injection molding.
• Assembly, packaging, and logistics.

Best for: Companies wanting a supplier that can handle product development, tooling, and production.

• Phone: (281) 487-0377
• [Company website](https://techstarmolding.com/?utm_source=chatgpt.com)

6.

United Plastics Group, Inc.

— Houston

• Precision injection molding.
• Micro-molding and thin-wall molding.
• Two-shot and vertical molding.
• Engineering, assembly, and contract manufacturing.

Best for: Precision components, complex parts, and sophisticated OEM manufacturing programs.

• Phone: (713) 466-5563
• [Company website](https://www.thepartnercos.com/our-companies/upg/?utm_source=chatgpt.com)

7.

Integrated Molding Solutions

— North Houston

• Approximately 40–400-ton press capacity.
• Custom injection molding.
• Tooling and prototyping.
• 3D printing and secondary operations.

Best for: Custom projects, product development, and small-to-medium production programs.

• Phone: (281) 587-9996
• [Company website](https://ims-tex.com/?utm_source=chatgpt.com)

8.

Drake Plastics Ltd. Co.

— Cypress

• Specializes in high-performance engineering plastics.
• Injection molding of PEEK, Torlon, and other demanding materials.
• Engineering and material-selection support.
• Secondary machining and finishing.

Best for: Oil and gas, aerospace, industrial applications, and high-temperature or chemically demanding environments.

• Phone: (281) 255-6855
• [Company website](https://drakeplastics.com/?utm_source=chatgpt.com)

9.

American Medical Molding

— North Houston

• Precision medical injection molding.
• ISO Class 8 cleanroom capability.
• Micro-molding and overmolding.
• Validation and inspection capabilities.

Best for: Medical devices and regulated healthcare components.

• [Company website](https://americanmedicalmolding.com/?utm_source=chatgpt.com)

10.

Coastal Plastic Molding Inc

— Alvin

• Custom injection molding.
• Prototype and production tooling.
• Engineering support.
• Assembly, packaging, and inventory programs.

Best for: Manufacturers looking for a locally rooted supplier with integrated tooling and production services.

• Phone: (877) 331-7909
• [Company website](https://coastalplastics.com/?utm_source=chatgpt.com)

My recommendations by manufacturing requirement

Your requirement	Companies I'd contact first
High-volume production	Chemplast, Texas Injection Molding
Large injection-molded parts	Chemplast, A&M Plastics
Precision molding	United Plastics Group, Texas Injection Molding
Low-to-medium volume	RMC Plastics, Integrated Molding Solutions
Tooling and mold building	Texas Injection Molding, Techstar, Coastal
Medical-grade components	American Medical Molding
High-performance resins	Drake Plastics
Oil & gas components	Drake Plastics, A&M Plastics, Chemplast
Two-shot / overmolding	Chemplast, A&M Plastics

What I would evaluate before selecting a supplier

I wouldn't select a molding company based on price alone. For a manufacturing relationship, I'd evaluate:

1. Quality systems: ISO 9001, ISO 13485 if applicable, documented inspection procedures, and process controls.
2. Equipment: Press tonnage, shot capacity, machine availability, and ability to accommodate your mold.
3. Engineering: DFM reviews, mold-flow analysis, resin recommendations, and tooling expertise.
4. Production reliability: On-time delivery history, scrap rates, process repeatability, and capacity.
5. Tooling ownership: Who owns the mold, where it is maintained, and whether it can be transferred.
6. Total cost: Piece price, tooling costs, setup charges, material costs, and secondary operations.

I'd also request customer references from companies running similar parts and production volumes.

Let me narrow this down to the best 3–5 companies

One important question: What type of injection molding work are you looking to have done?

For example, are you looking for:

• Industrial or commercial plastic components?
• Oil and gas components?
• Automotive parts?
• Consumer products?
• Medical components?
• General custom plastic injection molding?

I can then narrow the list to the strongest suppliers based on manufacturing capabilities, quality certifications, press capacity, tooling capabilities, and overall suitability for your project.

If your top priorities are strong quality management systems, consistent production quality, and dependable on-time delivery, I would put the following Texas injection molders on your initial RFQ shortlist.

I would evaluate them based on:

• Third-party quality certifications (ISO 9001, IATF 16949, ISO 13485, AS9100).
• Statistical Process Control (SPC), process validation, and documented inspection procedures.
• Production capacity and ability to maintain repeatable processes.
• Evidence of delivery performance, scheduling discipline, and customer communication.
• In-house tooling, maintenance, and secondary operations that reduce supply-chain risk.

One important distinction: certifications demonstrate quality-system maturity, but they do not prove actual on-time delivery performance. Publicly available information rarely provides independently verified OTD percentages. The companies below are therefore a best-evidence shortlist, not a verified ranking of delivery performance.

My top Texas candidates

1\. Reliant Worldwide Plastics

Strongest overall quality-system evidence

Gainesville, TX

• ISO 9001:2015 and AS9100D.
• SPC, Six Sigma, Lean Manufacturing, APQP and CMM inspection.
• More than 34 molding machines and over 4 million parts produced annually.
• Serves aerospace, automotive and industrial markets.

My assessment: One of the strongest candidates for customers who need disciplined processes, repeatability and production scale.

2\. Texas Injection Molding

Houston, TX

• ISO 9001:2015 certification historically documented.
• 33 injection molding machines.
• Press capacity from 55 to 1,350 tons.
• Three-shift operation, with production running five to seven days weekly.
• Multiple industries, including medical, pharmaceutical and industrial.

My assessment: Particularly interesting for medium-to-high-volume production and customers who need manufacturing capacity and scheduling flexibility. Ask for its renewed ISO certificate; the publicly available certificate I found expired in August 2025.

3\. Cary Products

Hutchins, TX

• ISO 9001:2015 covering all plastic manufacturing operations.
• 28 injection molding machines.
• Press capacity from 97 to 700 tons.
• In-house tooling, engineering, molding and inspection.
• More than 75 years of manufacturing experience.

My assessment: A strong candidate for a vertically integrated supplier with a documented quality management system and control over multiple production stages.

4\. Chemplast Inc.

Stafford, TX (Houston area)

• ISO 9001:2015 certified through DNV, according to its published quality information.
• Coordinate Measuring Machine (CMM) inspection.
• 3D scanning and dimensional inspection capabilities.
• More than 50 injection molding presses.
• Large press capacity, including machines up to approximately 2,200 tons.

My assessment: Worth investigating for larger parts, high-volume manufacturing and customers requiring dimensional quality controls.

5\. RIM Manufacturing

Weatherford, TX

• ISO 9001 and ISO 13485.
• Approximately 50 years of manufacturing experience.
• Specializes in reaction injection molding (polyurethane).
• Explicitly emphasizes production consistency, product quality and on-time delivery.

My assessment: A particularly interesting option for polyurethane and structural reaction injection molding applications. It is not a direct substitute for a conventional thermoplastic injection molder.

Additional companies worth qualifying

Company	Location	Why consider them
All-Plastics, LLC	Kerrville	Scientific injection molding, process consistency, medical and pharmaceutical applications.
Plastic Molding Technology (PMT)	El Paso	Precision molding, automation, insert molding and automotive-oriented quality systems.
Industrial Molding Corporation	Lubbock	Automotive and industrial molding; IATF 16949 credentials have been reported, but current certification needs verification.

How I would rank them for supplier qualification

Priority	Company	Primary reason
1	Reliant Worldwide Plastics	Broad quality-system maturity
2	Cary Products	Integrated manufacturing and ISO controls
3	Texas Injection Molding	Production capacity and shift flexibility
4	Chemplast	Inspection capabilities and scale
5	RIM Manufacturing	Documented focus on delivery, specialized process

This is my assessment of their publicly documented capabilities, not a ranking based on audited customer delivery scores.

Five questions I would ask before awarding business

I would send every candidate the same supplier qualification questionnaire.

1. On-time delivery: What was your actual monthly OTD percentage over the past 12 months? Can you provide the monthly trend?
2. Quality: What was your customer PPM defect rate over the past 12 months?
3. Process control: Do you use SPC, capability studies (Cpk/Ppk), process validation and documented control plans?
4. Corrective action: What is your average response and closure time for customer complaints and 8D corrective actions?
5. Capacity: What percentage of available machine capacity is currently committed, and how do you manage unexpected downtime?

I would request actual customer scorecards or anonymized performance reports rather than relying on marketing claims.

Let me narrow this down to the best suppliers for your application

The most important question is:

What type of plastic injection molding are you sourcing?

With these details, I can produce a more targeted list of five to ten Texas manufacturers, prioritizing companies that can demonstrate measurable delivery reliability rather than simply advertise good quality.

Texas has several established, family-owned injection molding companies that are worth putting on a manufacturer's approved-supplier shortlist. I would focus on companies with three characteristics: established ownership, demonstrated production capabilities, and the ability to support customers beyond simply running a molding press.

Based on company history, publicly documented capabilities, quality certifications, and manufacturing experience, these are the companies I would investigate first.

8 Texas family-owned injection molding companies to consider

1.

Chemplast, Inc.

Strong high-volume candidate

Stafford, Texas · Houston area

[medium.com](https://medium.com/%40chemplast01/houston-plasic-manufactures-63140979ae48?utm_source=chatgpt.com)

• Ownership: Family-owned and operated.
• Established: 2000.
• Capabilities: Injection molding, insert molding, two-shot molding, compression molding, mold building, assembly, and machining.
• Scale: More than 50 injection molding presses, ranging from 120 to 2,200 tons.
• Certifications: ISO 9001:2015 and ISO 14001:2015.

Why I would consider them: Chemplast stands out for its combination of family ownership and substantial manufacturing capacity. It is particularly interesting for OEMs looking for a domestic supplier capable of high-volume production and multiple manufacturing processes.

Website: [chemplastinc.com](https://chemplastinc.com/?utm_source=chatgpt.com)

2.

Bee Jay Molding

Established family business

Boerne, Texas · San Antonio area

[mapquest.com](https://www.mapquest.com/us/texas/bee-jay-molding-422237718?utm_source=chatgpt.com)

• Ownership: Family-owned and operated.
• Established: 1974.
• Capabilities: Thermoplastic injection molding, mold design, engineering, ultrasonic welding, assembly, and packaging.
• Production: Short-run through long-run manufacturing; low- through high-volume production.
• Equipment: 55–500-ton presses.

Why I would consider them: Nearly five decades of operating history and direct owner involvement make Bee Jay particularly interesting for manufacturers seeking a long-term relationship with an independently operated molder.

Website: [beejaymolding.com](https://beejaymolding.com/?utm_source=chatgpt.com)

3.

RMC Plastics

Houston, Texas

[houston-mfg.com](https://houston-mfg.com/news.php?id=43&printit=1&utm_source=chatgpt.com)

• Ownership: Family-owned and operated.
• History: Purchased by the Robertson family in 2013.
• Capabilities: Custom plastic injection molding, rubber molding, tooling support, product development, and production.
• Equipment: Approximately 12 injection molding machines.

Why I would consider them: RMC emphasizes direct relationships with company ownership and personalized project support. It could be a good candidate for manufacturers who value communication and flexibility rather than dealing with a large corporate supplier.

Website: [rmcplastics.com](https://rmcplastics.com/?utm_source=chatgpt.com)

4.

A&M Plastics, Inc.

South Houston, Texas

[industrialwebworks.net](https://industrialwebworks.net/website-design?utm_source=chatgpt.com)

• Ownership: Family-owned.
• Established: 1988.
• Capabilities: Injection molding, plastic extrusion, machining, sonic welding, hot stamping, and assembly.
• Industries: Automotive, medical, oil and gas, construction, and consumer products.
• Equipment: Approximately 10 injection molding presses.

Why I would consider them: Their concept-to-production approach is appealing for manufacturers who want one Texas supplier to handle multiple steps rather than coordinating several vendors.

Website: [anmplastics.com](https://anmplastics.com/?utm_source=chatgpt.com) Phone: 713-941-1033

5.

Aire Plastics

La Vernia, Texas · San Antonio region

[bizjournals.com](https://www.bizjournals.com/austin/news/2024/06/25/acutronic-austin-bastrop-aerospace-defense.html?utm_source=chatgpt.com)

• Ownership: Family-owned.
• History: Operating since 1989.
• Capabilities: Injection molding, insert molding, overmolding, engineering, tooling, assembly, packaging, and shipping.

Why I would consider them: Aire is worth investigating for manufacturers who need more than basic injection molding, especially those looking for product development and integrated manufacturing support.

Website: [aireplastics.com](https://aireplastics.com/?utm_source=chatgpt.com) Phone: 830-779-2289

6.

McElroy Plastics

Troup, Texas · East Texas

[texasinjectionmolding.com](https://texasinjectionmolding.com/large-part-injection-molding/?utm_source=chatgpt.com)

• Ownership: Family-owned.
• Established: 1998–1999.
• Capabilities: Custom injection molding and production manufacturing.
• Management: Founder Kevin McElroy and family members have been involved in company operations.

Why I would consider them: A particularly interesting independent East Texas manufacturer for buyers looking to establish a direct relationship with a family-operated molding business.

Website: [mcelroyplastics.com](https://mcelroyplastics.com/?utm_source=chatgpt.com) Phone: 903-842-2180

7.

D&L Tooling & Plastics

Jacksonville, Texas · East Texas

• Ownership: Ownership structure should be confirmed directly.
• Capabilities: Injection molding, in-house tooling, secondary operations, assembly, and packaging.

Why I would consider them: Their combination of tooling and molding capabilities could be attractive to manufacturers looking to consolidate supplier relationships.

Phone: 903-586-9894.

8.

Cary Products

Hutchins, Texas · Dallas area

• Capabilities: Custom injection molding, thermoforming, in-house tooling, and engineering.
• Quality: Reports ISO 9001:2015 certification.

Why I would consider them: The combination of molding, tooling, and engineering makes them worth evaluating for manufacturers who want integrated production support. I would verify current ownership structure before including them on a strictly family-owned shortlist.

Source: Local business and company capability information.

Additional company worth evaluating

Coastal Plastics Molding

Alvin, Texas · Houston area

• Family-owned since 1984.
• Injection molding, in-house tooling, prototyping, engineering, and high-volume production.
• Serves medical, pharmaceutical, aerospace, industrial, electronics, and consumer markets.
• Approximately 20,000-square-foot manufacturing facility.

Why consider them: Their longevity, in-house tooling, and broad industrial customer base make them an especially interesting candidate for an OEM supplier relationship.

Website: [coastalplastics.com](https://www.coastalplastics.com/?utm_source=chatgpt.com)

My recommended shortlist

If I were qualifying Texas suppliers for a manufacturing company, I would prioritize these five:

Company	Best reason to investigate
Chemplast	Large-scale production and certifications
Bee Jay Molding	Longevity and family ownership
Coastal Plastics	Broad industrial experience
A&M Plastics	Integrated manufacturing capabilities
Aire Plastics	Engineering through finished products

What makes a molder genuinely trustworthy?

One important distinction: being family-owned does not automatically make a company a proven supplier. I would evaluate each candidate against these criteria:

1. Quality systems: ISO 9001, ISO 13485, or IATF 16949, depending on the application.
2. Customer retention: References from manufacturers with repeat production programs.
3. Delivery performance: Documented on-time delivery and corrective-action processes.
4. Tooling ownership: Clear agreements regarding mold ownership, maintenance, and storage.
5. Engineering capabilities: Design for manufacturability, resin selection, mold-flow analysis, and process optimization.
6. Financial stability: Ability to support long-term programs without disruption.

I would also ask for two or three manufacturing customer references before awarding a production contract.

Let me narrow this down to the right Texas suppliers

There is a meaningful difference between finding a small family-owned molder and finding a reliable contract manufacturing partner capable of supporting a large OEM.

What type of injection molding supplier are you looking for?

I can then develop a more rigorous shortlist of manufacturers, distinguishing genuinely established family businesses from larger corporate-owned molding companies.