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Automotive Plastic Parts Manufacturers

Last updated: January 2026

This directory lists 87 automotive plastic parts manufacturers across the United States, from specialized low-volume IMD/IMF component molders to large-scale, high-volume injection molding operations for exterior body panels and interior trim.

Buyers frequently seek solutions for reducing vehicle weight through plasticization, improving interior aesthetics with soft-touch materials, or developing robust exterior components resistant to UV and impact. They grapple with challenges like achieving tight tolerances for snap-fit assemblies, ensuring low VOC emissions for interior cabin air quality, and integrating multiple functions into single plastic parts, often requiring multi-shot molding capabilities.

The landscape of automotive plastic parts manufacturers includes several distinct types. Some specialize in precision custom injection molding for intricate functional components, while others focus on high-volume production of larger parts like bumpers or dashboards. There are also custom mold builders who might not mold parts themselves but design and fabricate the tooling, and integrated suppliers who offer design, prototyping, tooling, molding, and secondary operations like painting or assembly under one roof.

To streamline the sourcing process, buyers should prepare detailed CAD models, material specifications (including specific resin grades and additives), desired annual usage (EAU) forecasts, and a clear understanding of critical-to-quality (CTQ) features and dimensional tolerances. Suppliers, in turn, expect a comprehensive RFQ package to provide accurate DFM feedback, tooling cost breakdowns, and part piece price quotations, often requiring clarity on the project's development phase and required PPAP level.

A significant trend in this category is the accelerated shift towards electric vehicle (EV) platforms, which often demand lighter-weight structural components, advanced battery enclosures, and innovative thermal management solutions. This pushes manufacturers to explore new high-performance polymers, composite materials, and more complex part consolidation strategies, alongside an increased focus on sustainable and recycled content.

87 companies·57 emails·81 phones

Company Directory

87 companies nationwide

Advanced Plastiform, Inc. specializes in custom plastic manufacturing for the automotive industry. They offer injection molding, thermoforming, pressure forming, and CNC robotic trimming. The company produces high-quality plastic parts for car production, emphasizing precision, repeatability, and value-added assembly services.

ADV Imagine specializes in advanced composite manufacturing, utilizing fiberglass and carbon fiber materials. The company offers R&D, precision design, and full-scale production for components. They provide precision-engineered parts for high-performance automotive vehicles, aerospace, defense, marine, and entertainment industries, from low-volume runs.

Fremont, CA

Based in Fremont, CA, AJ Solutions Machining provides precision CNC machining for custom plastic fabrication. They offer prototype and production milling and turning services, working with a wide range of plastics including Delrin, ABS, Polycarbonate, and PEEK. The company delivers close tolerance, high-precision quality parts to industries like aerospace, automation, and defense.

Autronic Plastics, Inc. provides custom plastic injection molding services from Long Island, NY. They specialize in difficult-to-process engineering resins, metal replacement, and precision plastic components. With in-house design, tooling, and rapid prototyping, they bring products from concept to completion, manufacturing diverse plastic parts.

Hayward, CA

Bell Plastics, based in Hayward, CA, specializes in custom plastic and metal fabrication. Offering services like vacuum forming, bending, cutting, and welding, they produce parts from small components to car-sized molds. They serve various industries, including automotive, handling both one-off and high-volume production.

Santa Fe Springs, CA

Bolero Plastics, based in Santa Fe Springs, CA, specializes in custom thermoformed plastics for various industrial and commercial applications. They offer comprehensive manufacturing services, including small to very large custom thermoforming, CNC machining, fabrication, assembly, and finishing solutions for tailored plastic components.

San Clemente, CA

Based in San Clemente, CA, Composite Manufacturing Inc. specializes in advanced custom carbon fiber and composite solutions for automotive, aerospace, and industrial applications. They provide comprehensive in-house design, tooling, and manufacturing expertise, delivering strong and lightweight parts tailored to client specifications.

San Diego, CA

Based in San Diego, CA, Custom Engineering Plastics (CEP) specializes in plastic injection molding services. The company produces short to medium run production parts, serving various industries across the southwestern United States with its manufacturing capabilities.

Elgin, IL

Chemtech Plastics specializes in automotive injection molding and precision plastic part manufacturing. The company offers capabilities including toolmaking, engineering, and quality assurance. They are IATF 16949 and ISO 9001 certified, serving the automotive, medical, electronics, and optical lighting industries.

Auburn Hills, MI

CIE USA, formerly Century Plastics, manufactures high-quality automotive plastic parts. Based in Auburn Hills, MI, the company specializes in plastic technology, providing essential components and solutions for the automotive sector.

Warren, OR

Composites Universal Group, based in Warren, OR, manufactures advanced composite plastic parts for the automotive industry. With 25+ years of experience, they offer end-to-end services including prototyping, engineering, tooling, and full production. They provide creative solutions with meticulous quality control.

Opelika, AL

Based in Opelika, AL, Cumberland Plastic Solutions offers plastic injection molding, precision tooling, and automated assembly services. Operating 43 injection machines, the company manufactures high-quality plastic parts for the automotive, powersports, and renewable energy sectors, supporting projects from initial design to series production.

Clinton, IA

Custom-Pak, Inc. is a US-based industrial blow molded parts manufacturer operating six plants with over 200 blow mold machines. The company specializes in comprehensive blow molding services, including design, engineering, advanced tool building, robotic automation, and extensive finishing capabilities for diverse industrial plastic components.

Based in North Andover, MA, Custom Plastic Fabrications, LLC (CPF) manufactures custom plastic products for the industrial market. CPF offers prototypes and full production, focusing on bringing client designs to life with cost-effective, high-quality solutions. They specialize in various fabrication techniques for diverse industrial requirements.

Jackson, MI

Diversified Engineering & Plastics, based in Jackson, MI, specializes in plastic injection molding, providing a range of plastic products and comprehensive engineering services. The company supports various industries with custom plastic part manufacturing and design solutions from its US facility.

Based in Erie, PA, Executool specializes in precision plastic injection molding for the automotive, electronic, and medical industries. The company offers complete design and manufacturing of close tolerance plastic injection molds, working with engineering-grade resin polymers to produce high-quality components.

Howe, IN

Based in Howe, IN, Exo-s is a plastic functional system designer and manufacturer. With over 50 years of expertise, the company specializes in injection and blow molding processes for plastic parts manufacturing. They develop value-added solutions for specialized applications, proudly serving the automotive, medical, and industrial markets.

Mchenry, IL

Based in McHenry, IL, Fabrik Molded Plastics, Inc. provides custom plastic injection and insert molding services. They specialize in manufacturing automotive plastic parts like throttle bodies, LED tail light lenses, and sensors. Capabilities include two-shot and scientific injection molding, serving automotive, healthcare, and industrial markets.

Baraboo, WI

Flambeau is a custom manufacturer based in Baraboo, WI, specializing in injection-molded and blow-molded thermoplastic components and assemblies. With over 70 years of experience, the company provides comprehensive product and tooling solutions for a wide range of industrial applications, including contract manufacturing.

Bad Axe, MI

Gemini Group manufactures engineered plastic products and metal tooling solutions for major automotive OEMs and suppliers. They specialize in automotive interior trim, cargo management systems, and load floors. Capabilities include profile extrusion, co-extrusion, technical blow molding, and two-shot injection molding for various plastic components.

Bedford, NH

Based in Bedford, NH, Gregstrom Corporation is a custom rotational molder and heavy gauge thermoformer. They specialize in vacuum, pressure, and twin sheet forming for high-quality plastic parts. The company manufactures automotive plastic fuel tanks, manifolds, and various industrial housings, serving partners for nearly 70 years.

Elgin, IL

Based in Elgin, IL, Hansen Plastics specializes in the manufacturing of injection molded plastic parts for the automotive industry. The company produces a range of automotive plastics components, providing essential parts for various applications within the sector with dedicated manufacturing services.

Novelty Bias Binding, RI

Hope Global specializes in delivering automotive interior components as a Tier I and OEM supplier. They offer expertise in fabric, leather, vinyl, and plastic molding, providing solutions for wire carriers and seating systems. The company integrates innovative cut, sew, and assembly capabilities for high-quality vehicle components.

Blacklick, OH

Hub Plastics specializes in blow molding custom and stock plastic bottles and jars from materials like HDPE, LDPE, PP, PET, and post-consumer resins. They serve various industries, including automotive, food, pharmaceutical, and personal care. The company also designs and develops customized packaging products and molds.

Brocton, NY

Based in Brocton, NY, Jamestown Plastics is a custom plastic manufacturer with over 67 years of experience in thermoforming. The company designs and produces tailored plastic solutions, including automotive trim components and packaging, focusing on improving efficiency and reducing costs for clients.

Modesto, CA

Based in Modesto, CA, Jatco operates a plastics molding facility. They specialize in manufacturing plastic components for the automotive industry, producing parts for cars, healthcare, and solar energy products. Their capabilities also cover agriculture, household items, gadgets, toys, and diverse structural plastic applications.

Palatine, IL

JDI Plastics, based in Palatine, IL, is a custom injection molding company. They specialize in reliable, high-quality automotive plastic parts and injection molding services. The company meets precise manufacturer needs, streamlining supply chains through production management and various value-added offerings.

Grand Rapids, MI

Kendrick Plastics, headquartered in Grand Rapids, MI, designs and manufactures decorative interior trim components and assemblies for the automotive industry. They provide engineering, product development, and manufacturing services for vehicle interior applications like instrument panels and door panels.

Fenton, MO

Based in Fenton, MO, Koller Craft, LLC specializes in injection molded plastic automotive components. The company adheres to industry standards, providing quality parts for the automotive sector. They focus on exceeding expectations through their manufacturing capabilities for plastic components.

Arnold, MO

Based in Arnold, MO, LMC Industries, Inc. is a contract manufacturer specializing in complex part programs. They offer insert molding and plastic overmolding services, alongside metal stamping and tool & die support. The company provides a responsive supply chain for quality and safety-focused manufacturing programs for various industries.

San Marcos, CA

Based in San Marcos, CA, MGM Plastics is a custom plastic fabrication and machining company established in 1980. They provide tailor-made fabricated parts and products utilizing CNC routing, plastic welding, and acrylic/polycarbonate expertise. The company serves diverse commercial clients for various plastic manufacturing needs.

New Rochelle, NY

Based in New Rochelle, NY, Mission Plastics, Inc. is an ISO 13485 certified custom injection-molding manufacturer. They produce high-quality plastic products and OEM parts, offering injection, insert, and micro-molding services. Managing projects from concept to fulfillment, they serve Automotive, Medical, and Commercial industries.

Chino, CA

Norco Plastics, Inc. is a custom plastic mold injection company based in Chino, CA. Specializing in large tonnage capacity up to 2800 tons, they offer 24/7 production and end-to-end manufacturing solutions including assembly. The company manufactures plastic components for the automotive, medical, and agriculture industries.

Canton, OH

Based in Canton, OH, Paarlo Plastics Inc. specializes in custom blow molding high-quality plastic parts for the automotive sector. Leveraging 40 years of experience and an 80,000 sq ft facility, they produce precision components using various thermoplastics, ensuring consistent and reliable on-time delivery.

Huntington Beach, CA

Based in Huntington Beach, CA, PRODUCT DESIGN DEVELOPMENT, INC. specializes in custom plastic thermoforming and fabrication. They produce parts from polycarbonate and polypropylene for automotive, aerospace, and healthcare industries. Capabilities include deep draw forming, die cutting, and assembly, managing projects from prototype to production.

Pomona, CA

Performance Engineered Products, based in Pomona, CA, manufactures custom injection molded plastics. Serving industries like automotive, aerospace, defense, and medical devices, they offer mold manufacturing, reverse engineering, and complex plastic component assembly. With over 40 years of experience, the company also provides sonic welding and JIT services for comprehensive support.

Based in Fairview, PA, PHB Inc. is an IATF 16949 certified US manufacturer specializing in automotive parts. The company provides plastic molding and injection molding services, alongside aluminum and zinc die casting, CNC machining, and tool and die solutions.

Torrance, CA

Plastic and Metal Center Inc. specializes in thick-gauge thermoforming, producing large plastic parts. Their capabilities include manufacturing automotive components such as vehicle door and dash panels, utility vehicle beds, and various other industrial plastic products.

Based in Erie, PA, Plastic Parts USA is a U.S.-based manufacturer specializing in custom engineered plastic injection molding parts. They offer high quality, cost-effective solutions for various products, accommodating both high and low volume production. The company emphasizes quick response and customer service.

Santa Fe Springs, CA

Polymershapes, located in Santa Fe Springs, CA, manufactures and supplies durable, cost-effective plastic components for the automotive industry. The company specializes in producing a variety of plastic parts tailored for automotive applications, serving as a direct provider in the United States.

Chesterfield, MI

PRISM Plastics, based in Chesterfield, MI, manufactures high-precision, tight tolerance injection molded plastic components. They serve major automotive OEMs, specializing in parts for safety-critical systems, electronics, fuel systems, steering, and drivetrains. The company aims to be a global innovative solution provider in injection molding.

Fredericksburg, OH

Based in Fredericksburg, OH, Quality Plastics LLC specializes in custom injection molding. The company offers comprehensive solutions spanning engineering, prototyping, assembly, and packaging, serving diverse industries with their versatile manufacturing capabilities for plastic parts.

Benicia, CA

Based in Benicia, California, Rapid Accu-Form, Inc. specializes in thermoforming, pressure forming, and vacuum forming of plastics. They produce custom plastic parts for diverse sectors including automotive, medical, aerospace, robotics, and consumer electronics. The company offers in-house tooling and CNC mold-making capabilities.

Portland, OR

RapidMade is a Portland, Oregon-based manufacturer specializing in custom thermoformed plastic parts and products. They offer rapid tooling, prototyping, CNC trimming, and assembly services, serving diverse sectors including automotive, robotics, aerospace, and heavy industry with durable, engineered solutions for various applications and production volumes.

Birmingham, AL

Based in Birmingham, AL, R.F. Plastics, LLC specializes in custom thermoformed plastic parts for the automotive, medical device, and aerospace industries. Their capabilities include vacuum forming, drape forming, 3D printing, 5-axis CNC routing, and comprehensive assembly services, offering full-service solutions from prototyping to production runs.

Bland, MO

Based in Bland, MO, Roberson Machine Company provides precision CNC machining from prototype to production. They offer CNC milling, turning, wire EDM, and additive plastics manufacturing. Serving industries such as automotive, medical, and robotics, the company focuses on delivering quality, precision, and reliable turnaround times for critical parts.

Toledo, OH

Based in Toledo, OH, Seagate Plastics manufactures custom plastic components. They specialize in extrusions, injection molding, CNC machining, fabrication, and assembly. Serving automotive and OEM clients, they operate manufacturing facilities across Ohio and Michigan, providing quality plastic solutions.

Based in Hanover, MA, SRC Plastics manufactures injection molded plastic parts and components. The company serves the automotive industry and transportation sector, providing quality custom solutions for various vehicle applications.

Shelby Township, MI

Based in Shelby Township, MI, Elite Mold & Engineering Inc. provides plastic injection molding services for the automotive industry. They offer prototype and production automotive molding, utilizing technologies like 3D tool printing. The company handles low-to-high volume manufacturing for diverse sectors including consumer, aerospace, and medical.

Upland, CA

Based in Upland, CA, Trademark Plastics specializes in high-volume, precision injection molding of plastic parts. Their 100,000 sq. ft. facility houses 51 injection molding machines (6-610 tons) and cleanrooms, providing full turnkey solutions from concept to prototypes. They are ISO 9001 and 13485 certified.

Westminster, CA

Tru-Form Plastics, based in Westminster, CA, specializes in custom heavy and thin gauge thermoforming of plastic parts. They offer comprehensive manufacturing services from prototyping to finishing. With AS9100 and ISO 9001:2015 certifications, they are a dependable supplier for automotive, aerospace, medical, and defense industries.

Valencia, CA

Based in Valencia, CA, Valencia Plastics Inc. provides high-volume, custom plastic injection and blow molded parts. With over two decades of experience, they specialize in manufacturing custom components and offer mold making services. The company utilizes various materials, including HDPE, post-consumer resin, and food-grade options.

Riverside, CA

Western Case, Inc. is a custom blow molding manufacturer based in Riverside, CA. With over 45 years of experience, they produce plastic carrying cases and custom blow molded products for automotive, construction, consumer goods, food, and medical industries. They offer turnkey service and just-in-time delivery.

Addison, IL

Based in Addison, IL, Woodland Plastics Corporation specializes in custom thermoset plastic injection molding. Serving the automotive, appliance, and electrical industries, they offer prototype to high-volume manufacturing. The company holds ISO 9001:2015 certification and aligns with AIAG and IATF 16949 quality systems, providing durable and heat-resistant plastic parts.

West Henrietta, NY

forteq Group specializes in precision injection molding, manufacturing highly precise plastic components for the automotive industry. Based in West Henrietta, NY, the company is dedicated to producing high-quality plastic parts that meet the stringent demands of modern automotive applications.

Stevensville, MI

Based in Stevensville, MI, Nova Stevensville manufactures high-quality plastic molded components for automotive and non-automotive industries. Utilizing numerous injection molding machines, the company provides comprehensive services from engineering design to final product delivery, emphasizing custom solutions and value-added manufacturing.

Lake Forest, CA

Based in Lake Forest, CA, RJC Mold specializes in plastic injection molding and mold manufacturing. They produce automotive exterior parts, including mudguards, grilles, and sensor holders. Services include overmolding, insert molding, and two-shot molding for diverse industries.

Grand Rapids, MI

Agape Plastics, based in Grand Rapids, MI, is an American-made, woman-owned company specializing in custom plastic injection molding and insert molding. They provide engineering, post-mold assembly, and value-added operations to develop cost-effective, custom plastic solutions. Serving North America for over 50 years.

Allegheny Performance Plastics specializes in manufacturing technically advanced, functional parts from high-performance, high-temperature polymers. They produce custom plastic components for demanding industrial applications, including those within the automotive sector. Based in Meadville, PA, the company provides comprehensive plastic machining and fabrication services.

Winfield, KS

Based in Winfield, KS, Hi-Rel Plastics & Molding, Inc. is a turn-key manufacturer. The company specializes in custom blow molding and plastic injection molding processes. They produce a wide variety of custom plastic components, suitable for automotive applications and diverse industrial requirements.

Century Mold designs, engineers, and manufactures precision plastic components for automotive OEMs and Tier 1s. With over 40 years of experience, the company supplies complex, high-volume plastic parts found in over 80% of U.S. vehicles. It also serves defense, industrial, and consumer markets.

Santa Paula, CA

Located in Santa Paula, CA, Composite Plastic Products Company (CPPC) manufactures composite parts and custom fabrications, including molds and plugs. Serving diverse sectors like automotive, transit, military, marine, and recreational, they offer consultation for new product development, operating solely in the United States.

Mahwah, NJ

Based in Mahwah, NJ, eMachineShop specializes in custom manufacturing of plastic parts through CNC machining, injection molding, and 3D printing. They provide rapid prototyping and full production runs for diverse industries, backed by over 25 years of experience.

Cedar Grove, NJ

Emco Industrial Plastics offers custom fabrication, machining, and injection molding of plastic and rubber components. Based in Cedar Grove, NJ, they provide high-precision CNC prototyping and production parts, including milling, turning, and laser cutting. The company serves diverse sectors, prominently including the automotive industry, along with aerospace and medical.

Howell Plastics specializes in custom thermoforming, manufacturing high-quality plastic packaging and products. They serve a diverse range of industries, including medical, industrial, and automotive sectors. As a division of F. M. Howell & Company, a Women's Business Enterprise, they leverage extensive experience to provide engineered plastic solutions.

Nashville, TN

Based in Nashville, TN, Global Thermoforming specializes in automotive plastic thermoforming, offering thick and thin gauge capabilities. They custom build tooling, machines, and extrude their own material, ensuring tight tolerances. Services include design, post-production machining, finishing, and assembly for diverse industries beyond automotive, like aerospace and medical.

Irvine, CA

Based in Irvine, CA, Plainfield Precision is a leading provider of injection molded plastics products and comprehensive manufacturing solutions. The company leverages precision engineering and advanced production capabilities to deliver high-quality plastic components, serving diverse industrial sectors with their manufacturing expertise.

Costa Mesa, CA

Based in Costa Mesa, CA, JG Plastics Group LLC is a precision injection molding company. They specialize in constructing tooling and molding demanding, close tolerance plastic parts using scientific molding principles and extensive mold making expertise. JG Plastics serves industrial clients, including defense and electrical connector manufacturers.

Township, MI

JVIS USA, LLC is a global manufacturer with expertise in automotive plastic parts. They offer innovative design, engineering, and vertically integrated processes to produce components for vehicles. Capabilities include interior and exterior systems, decorative molding, and functional plastics, supporting the automotive industry from concept to full product development.

Manitowoc, WI

Based in Manitowoc, WI, Kaysun Corporation, Inc. specializes in custom injection molding for complex applications. The company applies extensive materials science and injection molding expertise to produce high-performance plastic components for automotive OEMs, focusing on engineered excellence and sustainability.

Kelco Industries is a US-based manufacturing group, including Advanced Molding Technologies, specializing in custom plastic injection molding and over-molded plastics. They produce high-precision, mission-critical components, utilizing in-house engineering and rapid prototyping. Kelco offers scalable production systems for various industrial applications.

Santa Ana, CA

Based in Santa Ana, CA, Plastics Plus Technology is a woman-owned, USA contract manufacturer. The company specializes in custom injection molding and offers comprehensive value-added services for plastic parts manufacturing. They serve various industrial clients, providing tailored solutions from design to production.

Plainwell, MI

Based in Plainwell, MI, Preferred Plastics, Inc. specializes in manufacturing high-quality custom thermoplastic parts. The company utilizes innovative plastic extrusion and 3D printing processes, working with an extensive inventory of plastic materials like polypropylene. They are committed to efficient, on-budget delivery for industrial applications.

Richmond, IN

Based in Richmond, IN, Primex specializes in providing custom plastic automotive solutions. The company offers prefabricating and laminating plastic shapes and textures to meet client production needs. Primex focuses on sustainable plastic solutions, designing products that create value and address future requirements.

Orange, CA

R & B Plastics, based in Orange, CA, provides high-quality, close-tolerance machined plastic parts tailored for the automotive industry. The company manufactures components for both the new vehicle market and the aftermarket, meeting specific design requirements.

Roseville, MI

Based in Roseville, MI, RCO Engineering specializes in automotive plastic parts manufacturing, offering plastic injection molding, compression molding, and additive manufacturing. They provide low-volume production for interior and exterior components, leveraging extensive seating and interiors design expertise. RCO Engineering is IATF 16949:2016 certified, serving automotive clients.

Hartland, WI

Based in Hartland, WI, Retlaw Industries provides thermoplastic injection molding services, including custom tooling, design, and assembly. With over 40 years of experience and 19 injection molding machines, they manufacture specialized automobile plastics and components for diverse industries nationwide.

Brainerd, MN

Based in Brainerd, MN, Revolv Manufacturing provides custom plastic rotational molding and thermoforming services. The company offers expertise in the plastic industry, delivering high-quality products with efficiency and innovation. Capabilities include custom molding for diverse parts, sizes, and geometries, along with assembly services.

Glendora, CA

Based in Glendora, CA, Southwest Plastics manufactures custom plastic parts in the USA. They offer precision plastic injection molding, thermoset and thermoplastic molding, transfer molding, and compression molding services. The company provides durable, high-performance components suitable for demanding applications, ensuring reliable performance.

Shelbyville, IN

Based in Shelbyville, IN, Thunderbird Molding specializes in high-precision custom plastic injection molding and contract manufacturing services. They offer comprehensive mold design, prototyping, engineering, production, and assembly, helping clients realize cost improvements and faster market entry with their plastic components.

Goshen, IN

Based in Goshen, IN, Triangle Rubber & Plastics manufactures superior rubber and plastic components. The company provides crafted solutions for automotive interiors, focusing on enhancing comfort and aesthetics. They leverage expert craftsmanship to deliver high-quality parts for the automotive industry.

Based in Holyoke, MA, Universal Plastics is a custom blow molding supplier. The company specializes in extrusion blow molding, manufacturing plastic parts for various industries. These include medical, waste management, safety equipment, lawn and garden, and the automotive sector.

San Diego, CA

Based in San Diego, CA, ARRK provides comprehensive product development services, from rapid prototyping to production. They offer custom manufacturing solutions for plastic parts, utilizing advanced processes including urethane casting, 3D printing, CNC machining, tooling, and injection molding. ARRK supports clients in accelerating product launch with their extensive manufacturing knowledge and capabilities.

Newton Falls, OH

Venture Plastics Inc., an IATF 16949 certified injection molder, specializes in high-quality automotive components, including interior trim. Operating from facilities in Ohio and Texas, they offer comprehensive services from efficient part design and global tool production to value-added finishing and assembly, providing complete injection molding solutions for diverse markets.

Ammex Plastics is an automotive plastic parts manufacturer specializing in tight tolerance injection molded components. They offer expertise in engineering design, injection molding, and various materials to produce automotive connectors, fasteners, and suspension parts, meeting IATF 16949:2016 standards.

City Of Industry, CA

Based in City of Industry, CA, KS Group's KS Plastic division specializes in plastic injection molding and tooling. They manufacture precision plastic components for the automotive, electrical, medical, and consumer industries. Operating from a large US facility, KS Plastic provides comprehensive solutions for custom plastic part manufacturing.

Phoenix, AZ

Based in Phoenix, AZ, Summit Polymers specializes in manufacturing interior kinetic and decorative systems for the automotive industry. The company utilizes advanced processes to produce precision plastic components and assemblies, focusing on quality and excellence in every aspect of its operations.

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How to Choose a Company

  • Verify IATF 16949 Certification: For any serious automotive project, ensure the supplier possesses active IATF 16949 certification, not just ISO 9001. Request their certificate and audit scope, as this demonstrates a systemic commitment to automotive-specific quality management processes like APQP, FMEA, and PPAP.
  • Assess PPAP Documentation Capability: Beyond basic quality, inquire about their proficiency in preparing a full Production Part Approval Process (PPAP) submission. Ask for examples of past Control Plans, Measurement System Analysis (MSA) studies, and Initial Process Capability (CpK) reports they've produced for similar parts.
  • Evaluate Tooling Ownership & Maintenance: Clarify who owns the molds (typically the buyer) and the supplier's protocol for preventative maintenance, repair, and end-of-life planning for high-cavitation or multi-shot tooling. Inadequate planning here can lead to costly downtime or premature tool wear.
  • Match Technical Capabilities to Part Complexity: If your component requires complex features like tight tolerance snap fits, internal threads, or optical clarity, verify the supplier's specific experience with appropriate technologies like two-shot molding, hot runner systems, or specialized tooling finishes for textured surfaces.
  • Scrutinize Design for Manufacturability (DFM) Engagement: A key red flag is a supplier that provides a quote without offering proactive DFM feedback. A strong partner will challenge your design, suggest material alternatives for cost or performance, and identify potential molding issues (e.g., sink marks, warp, knit lines) before tooling begins.
  • Review Experience with Specific Resins and Additives: For demanding applications like exterior trim needing UV stability or interior components requiring low VOCs, confirm their track record with engineering resins such as PA66, PBT, PC/ABS blends, or TPOs, along with their expertise in managing various colorants and performance-enhancing additives.

Supplier Types at a Glance

TypeBest ForTypical MOQ
Custom Injection Molder (General)Functional components, interior structural parts, medium volumes, where cost-effectiveness and material versatility are key. Good for early-stage startups.5,000 - 50,000+ units
Automotive Tier 1/2 MolderHigh-volume OEM programs, safety-critical components, exterior panels, complex assemblies requiring IATF 16949, full PPAP, and specialized processes like multi-shot molding or IMD/IMF. Suited for established enterprises.50,000 - 500,000+ units
Proto & Low-Volume SpecialistProof-of-concept parts, pre-production runs, low EAU aftermarket components, or highly specialized luxury vehicle parts. Emphasizes quick turns and design iteration.100 - 5,000 units
Integrated Solutions ProviderProjects requiring design support, tooling build, molding, and comprehensive secondary operations (painting, assembly, testing) under one roof, reducing supply chain complexity.10,000 - 250,000+ units

Frequently Asked Questions

What's the difference between IATF 16949 and ISO 9001 for automotive plastic parts manufacturing?

While ISO 9001 is a foundational quality management system, IATF 16949 is specifically tailored for the automotive industry, building upon ISO 9001 with additional requirements for risk management, customer-specific requirements, defect prevention, and reduction of variation and waste in the supply chain. For any OEM-facing or Tier 1 automotive plastic part, IATF 16949 certification is almost always a mandatory requirement, ensuring a much higher standard of process control and quality documentation, including detailed APQP and PPAP procedures.

How does material selection impact VOC emissions in interior automotive plastic components?

Material selection is paramount for managing Volatile Organic Compounds (VOCs) in interior automotive parts, which are critical for cabin air quality and meeting regulatory standards (e.g., VDA 278, GMW 3059). Certain plastics, additives, and colorants can off-gas more than others, especially in higher temperatures. Suppliers must have expertise in selecting low-VOC resins (like specific grades of polypropylene or ABS), avoiding problematic plasticizers, and utilizing appropriate processing conditions to minimize post-molding emissions. Always request material data sheets and VOC test reports.

What key documentation should I expect during the PPAP submission for an automotive plastic part?

A robust PPAP (Production Part Approval Process) submission for an automotive plastic part should include, at minimum, a Design Record (drawings), Engineering Change Documents, Customer Engineering Approval, Design FMEA (DFMEA), Process Flow Diagram, Process FMEA (PFMEA), Control Plan, Measurement System Analysis (MSA) studies, Dimensional Results, Material Performance Test Results, Initial Process Studies (CpK), Qualified Laboratory Documentation, Appearance Approval Report (AAR) for aesthetic parts, Sample Product, Master Sample, Checking Aids, and a Part Submission Warrant (PSW). The level of submission (1-5) dictates which elements are required by the customer.

When should I consider multi-shot molding over overmolding for complex automotive plastic assemblies?

Multi-shot molding (or two-shot molding) is generally preferred for high-volume, complex automotive plastic parts where two or more materials need to be bonded without assembly, such as rigid enclosures with integrated soft-touch grips or components with integral seals. It offers superior part integrity, reduced cycle times, and lower assembly costs compared to overmolding, where a pre-molded part is placed into a second tool. However, multi-shot requires specialized tooling and molding machines, making it a larger initial investment best suited for projects with high EAU and critical performance requirements like leak resistance or ergonomic feel.

How do automotive plastic manufacturers manage tooling maintenance and ownership for high-volume production?

Tooling ownership for high-volume automotive plastic parts almost always resides with the buyer, even if the manufacturer sources or builds the tool. The manufacturer is typically responsible for preventative maintenance, repairs, and ensuring the tool's ongoing capability to produce specification-compliant parts throughout its lifecycle. This often involves a detailed maintenance schedule, documented repair logs, and a clear agreement on who covers the cost of consumables vs. major repairs. Before awarding, clarify their tooling strategy, including their in-house tool room capabilities and spare part policies for hot runner systems and critical components.

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