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Custom Plastic Molding Companies

Last updated: January 2026

This directory lists 123 custom plastic molding companies across the United States, from job shops to vertically integrated manufacturers.

Buyers are typically seeking custom plastic molding solutions when they've moved beyond conceptual design and need to realize a physical product, are scaling production volume, or are encountering issues with existing suppliers related to quality, cost, or capacity. The core challenges often revolve around achieving stringent dimensional tolerances, selecting the optimal polymer – be it an engineering thermoplastic or a thermoset – for specific environmental or mechanical demands, and ensuring robust part ejection and consistent aesthetics without warpage or sink marks. Effective material flow analysis (FEA) and strategic gate locations become critical in addressing these.

The supplier landscape ranges from agile, smaller molders specializing in rapid prototyping and lower volume runs with particular material expertise, to large-scale operations with extensive fleets of high-tonnage presses capable of executing complex multi-shot or overmolding projects for high-volume markets. Some focus exclusively on specific industries like medical (requiring cleanroom molding) or automotive (demanding IATF 16949 certification), while others offer broader capabilities including secondary operations like assembly, ultrasonic welding, or intricate finishing services. Understanding a supplier's core competency and operational scale is crucial for alignment.

The typical buying process for custom plastic molding begins with a comprehensive RFQ package. Buyers should come prepared with fully developed 3D CAD models (preferably STEP or IGES), detailed 2D drawings outlining critical dimensions and tolerances, precise material specifications, estimated annual volumes, and any specific aesthetic or functional requirements. Suppliers expect a willingness to engage in Design for Manufacturability (DFM) discussions to optimize part design for cost-effective and reliable molding, and clarity on expectations around tooling ownership, maintenance, and project timelines.

123 companies·83 emails·108 phones

Company Directory

123 companies nationwide

Temecula, CA

Based in Temecula, CA, GRIZZLE Industries provides expert custom injection molding and manufacturing services. They utilize presses ranging from 55 to 500-tons for short and long production runs, working with engineered resins. Services encompass design fusion, tooling, automation, and a dedicated quality assurance team for comprehensive project support.

Anaheim, CA

Based in Anaheim, CA, Action Mold offers custom plastic molding services with over 30 years of expertise in mold-making and plastic processing. They specialize in precision-driven injection molding, demonstrating mastery of the toughest resins to achieve high-performance results. The company provides comprehensive manufacturing solutions.

North Carolina, SC

Advanced Plastiform, Inc. provides custom plastic molding and fabrication services, specializing in thermoforming to produce affordable custom plastic parts. Established in 1988, the company serves diverse industries and businesses across North Carolina, South Carolina, Maryland, Georgia, and Pennsylvania, offering cost-effective solutions.

National City, CA

Based in National City, CA, Advance Plastics is a custom plastic injection molder established in 1978. The company provides custom plastic injection molding parts and tooling, with a production floor operating 24 hours daily. They offer individualized customer service, utilizing molds built by their trusted supplier, IMS.

La Vernia, TX

Based in La Vernia, TX, Aire Plastics, Inc. provides plastics manufacturing solutions. Specializing in injection molding, they offer services from initial concept and design engineering to assembly and packaging. The company supports projects from concept to distribution, ensuring efficient production of custom plastic components.

Rochester, NY

Alliance Precision Plastics specializes in custom plastic molding, offering plastic injection molding, in-house tooling, design, and engineering solutions. The company provides value-add assembly and quality assurance services. Serving industries including energy & utility, industrial manufacturing, medical & life science, and specialty markets, Alliance delivers engineered component parts.

Long Island, NY

Autronic Plastics, Inc. is a custom plastic injection molding company providing services from concept to completion. With in-house designers and engineers, they specialize in difficult-to-process engineering resins, metal replacement, and precision plastic components. API offers a full-service mold shop, on-site tool room, and rapid prototyping capabilities.

Minneapolis, MN

Aprios Custom Manufacturing, based in Minneapolis, MN, provides innovative solutions for custom plastic molding. They specialize in design for manufacturing, prototype and production tooling, and diverse injection molding techniques, including overmolding, insert molding, and micro-molding. The company operates presses ranging from 15 to 610 tons.

Cincinnati, OH

Based in Cincinnati, OH, ASPEC Plastics is a custom thermoplastic manufacturer. They specialize in plastic injection molding and insert molding, offering comprehensive in-house capabilities from design and mold-making to production and secondary operations. ASPEC serves industrial and commercial product manufacturers, providing a single source for custom plastic parts.

Ada, OH

Based in Ada, OH, Associated Plastics Corporation is a custom plastic injection molding company. They offer engineering and design assistance, utilizing a wide variety of generic to engineered resins. With 2000-ton machining capabilities, APC provides turnkey operations for industries like automotive, electronic, food processing, sports, toy, and horticulture.

Aurora, OH

Based in Aurora, OH, Automation Plastics Corporation is an ISO 9001:2015 certified custom molder of thermoplastic injection molded parts. Since 1980, they have specialized in high-volume production of precision plastics, including tight tolerance functional components and heavy wall parts for specialty fittings. They also offer precision plastic machining and engineering support.

Fremont, CA

Based in Fremont, CA, Bayview Plastic Solutions, Inc. specializes in plastic fabrication and custom manufacturing. They offer in-house mold making, vacuum forming, and custom plastic product solutions for prototyping and production. Their capabilities support diverse industries, including medical devices, transportation, contract manufacturing, technology, government, and retail & store displays.

Mesquite, TX

Bentley Injection Molding, based in Mesquite, TX, specializes in custom plastic injection molding solutions. The company provides services for diverse sectors, including the oil industry for drilling rig components, medical devices, and schools for exterior warning lights. They also produce automotive plastic parts and offer injection molding tooling.

Shiner, TX

Based in Shiner, TX, Boedeker Plastics specializes in custom plastic injection molded and CNC machined parts. They also provide a substantial inventory of plastic sheet, rod, and tube materials, offering cut-to-size services and same-day shipping for industrial applications requiring engineered plastic components.

Hutchins, TX

Cary Products, based in Hutchins, TX, is a custom plastic manufacturer. The company specializes in injection molding and thermoforming services, offering full-service manufacturing and tooling solutions. With over 75 years of expertise, it serves industries including automotive, energy, agriculture, construction, and commercial markets.

Benicia, CA

Based in Benicia, CA, Crown Plastics Usa offers custom plastic injection molding and assembly. Services range from rapid prototyping to low-volume and mass production. Capabilities include tooling design, material choices, and mold construction, utilizing presses from 28 to 400 tons within a 30,000 sq ft facility.

Tracy, CA

Based in Tracy, CA, Central Plastics is a custom plastic manufacturer specializing in injection molding, thermoforming, and injection stretch blow molding. They offer tooling and value-added services for diverse markets such as healthcare, aerospace, packaging, defense, and electronics. The company is ISO 13485:2016 and AS 9100 Rev D certified.

Meadville, PA

Based in Meadville, PA, C&J Industries specializes in high-precision custom plastic injection molding and contract manufacturing. They offer two-shot molding, assembly, and advanced finishing. Serving medical, pharmaceutical, technology, and automotive industries, C&J Industries is ISO 13485:2016, ISO 9001:2015, and FDA registered, operating Class 7 & 8 Cleanrooms.

Alhambra, CA

Based in Alhambra, California, Quality Plastics offers custom injection molding services. They provide plastic injection molds, molded parts, and complete plastic products. The company emphasizes precision, consistency, and quality to meet various industries' custom plastic component and production needs.

Whiting, IN

Based in Whiting, IN, Cooper Plastics is a custom plastic manufacturer, established in 2023 as a division of PolyJohn Enterprises. They specialize in transforming thermoplastic materials into dependable plastic parts. Capabilities include sheet extrusion, thermoforming, rotational molding, injection molding, structural foam injection molding, and blow molding.

Freedom, PA

Crescent Industries, located in Freedom, PA, provides custom injection molding, tooling, and post-molding services. With over 75 years of experience, the company delivers solutions based on design for manufacturing principles. They serve diverse sectors including medical, pharmaceutical, defense, military, and industrial product markets, offering precision manufacturing.

Auburn, NY

Currier Plastics provides custom injection molding and custom blow molding services, along with tooling and design engineering expertise. They specialize in building high-quality plastic components for industries such as healthcare and packaging, emphasizing superior value and efficient velocity in their US-based operations.

Austin, TX

Based in Austin, Texas, Cypress Industries provides ISO 9001:2000 UL Certified custom plastic injection molding and mold manufacturing. They specialize in plastics design, mold making, and tooling. With manufacturing facilities in the US and China, the company offers quick-turn or low-cost custom tooling solutions for injection molding projects.

El Cajon, CA

Based in El Cajon, CA, Damar Plastics specializes in plastic injection and blow molding manufacturing for customers in Southern California. The company offers a roadmap from vision to reality, including services like design, mold manufacturing, injection and blow molding, and various value-added solutions.

Erie, PA

Based in Erie, PA, Executool specializes in complete design and manufacturing of close tolerance plastic injection molds. They provide precision injection molding services for tight tolerance engineering-grade resin polymers. Executool serves the automotive, electronic, and medical industries, also offering mold repair and production improvement.

Houston, TX

Based in Houston, TX, Houston Plastic Products specializes in plastic injection molding, producing quality custom components. The company serves a diverse range of industries including energy, medical, automation, and consumer sectors, providing tailored solutions for various application needs.

Houston, TX

Based in Houston, TX, Integrated Molding Solutions (IMS) specializes in custom plastic manufacturing and injection molding services. The company leverages technology to provide advanced solutions in plastic molding, catering to diverse industry needs.

Vandalia, OH

Innovative Plastic Molders, based in Vandalia, OH, specializes in custom plastic injection molding. They operate over 30 electric presses, ranging from 75 to 1,700 tons, in a 120,000 sq ft facility. The company processes engineer-grade polymers and offers value-added services such as decorating, assembly, and specialized packaging.

Berea, OH

Based in Berea, OH, JACO Manufacturing specializes in custom molded, close tolerance plastic parts. They provide comprehensive in-house capabilities, from engineering design and custom tooling to injection molding production and quality assurance. JACO transforms ideas into finished, high-quality plastic components from its United States-based operations.

Modesto, CA

Based in Modesto, CA, JATCO provides plastic molding production, assembly, packaging, storage, and distribution services. Leveraging over forty years of experience, the company serves a wide variety of industries, offering comprehensive custom plastic molding solutions from manufacturing to final delivery.

Palatine, IL

Based in Palatine, IL, JDI Plastics is a custom injection molding company that specializes in providing high-quality plastic products. They simplify customer supply chains through production management and value-added services, tailoring solutions to individual client needs.

Brookville, OH

Based in Brookville, OH, K&B Molded Products is an ISO 9001:2015 Certified provider specializing in plastic injection molding, custom molds, and tooling. They offer turnkey solutions and a proven 6-stage process designed to streamline product development and manufacturing. Capabilities include sonic welding, over-molding, and hot stamping for diverse applications.

Mcallen, TX

Based in McAllen, TX, King's ECO Plastics is an ISO/TS 16949:2009 & UL certified company specializing in custom precision injection molding. With over 30 years of experience, they offer services including part design, prototyping, material selection, pad printing, general assembly, and customized post-molding operations.

San Jose, CA

Based in San Jose, CA, KS Plastic operates a 55,000-square-foot manufacturing facility. The company specializes in precision injection molding, providing custom plastic molding solutions. They are specially equipped to serve industries requiring high-precision components, including medical devices and diagnostic applications.

Pflugerville, TX

Medway Plastics Corporation provides custom plastic injection molding since 1974, with facilities in Long Beach, CA, and Round Rock, TX. They manufacture a wide range of plastic products, handling diverse part sizes. The company prioritizes sustainable processes, utilizing an electric co-generation system for energy and recycling plastic scrap.

Dallas, TX

Based in Dallas, TX, Meridian Products Corp. offers custom injection molding, tooling, and assembly services. They work with materials like ABS, nylon, and polycarbonate for industries including aerospace, automotive, medical, electronics, and consumer. Capabilities encompass prototyping, design, and post-molding decorating, providing comprehensive manufacturing solutions.

Metro Custom Plastics specializes in conventional plastic injection molding, with over 50 years of experience. Their 14-machine, 24-hour shop processes diverse materials, accommodating clamping forces from 230 to 560 tons and shot sizes up to 80 ounces. They support both prototype and large production orders.

New Berlin, WI

Midland Plastics, Inc. offers custom plastic manufacturing and forming technology from its New Berlin, WI location. Services include machining, thermoforming, and custom fabrication, alongside custom extrusions. The company also distributes a variety of plastic materials, specializing in high-performance plastics, with operations dating back to 1945.

Roseville, MI

Based in Roseville, MI, Midwest Mold Services specializes in plastic part development and manufacturing. They build production and pre-production plastic injection tooling, offering comprehensive services including low volume, 2-shot, and conventional plastic injection molding for custom parts. The company aims to optimize efficiency in plastic component development.

New Rochelle, NY

Mission Plastics, Inc. provides full-spectrum custom injection molding services, including insert and micro-molding. This ISO 13485 certified manufacturer operates 24/7, offering mold making, prototyping, and fulfillment solutions. With three decades of experience, they serve high-volume OEM customers in the Medical, Automotive, and Commercial industries.

Molding Dynamics, Inc. specializes in custom plastic injection molding, adept at meeting tight tolerances and working with engineering grade and commodity resins. Their capabilities include overmolding, executed with precision and high standards of quality from engineering through delivery for exceptional results.

Lake Geneva, WI

Based in Lake Geneva, WI, Midwest Precision Molding provides custom plastic injection molding services. The company specializes in producing custom plastic gears, inserts, and bobbins, focusing on tight tolerance and precision. With over 40 machines, including new Sodick presses, and an onsite tool room, they offer comprehensive molding solutions.

Dayton, OH

Based in Dayton, OH, MTM Molded Products Co. provides custom plastic molding services for durable, American-made plastic boxes and cases. They specialize in protection and organization solutions, offering over 100 styles of living-hinged boxes made from prime-grade plastic. Options include various colors, foam inserts, and custom branding.

Jacksonville, TX

Myco Plastics, Inc. provides custom injection molding services and precision plastic parts. Operating since 1982, the company serves government and industry markets. Based in Jacksonville, TX, it recently acquired property for expansion, aiming to increase warehousing and production space to meet growing demand.

Norck specializes in custom plastic molding, offering end-to-end support from prototyping to mass production. Services include injection molding, design for manufacturability, material selection, and moldflow simulation. They manufacture custom plastic parts for diverse industries, including medical (orthosis and prosthesis devices) and industrial applications.

Chino, CA

Based in Chino, CA, Norco Plastics, Inc. specializes in custom plastic injection molding services. They utilize large tonnage equipment up to 2800 tons, offering 24/7 production capabilities and end-to-end manufacturing solutions. Services include assembly and secondary operations for industries such as automotive, construction, medical, agricultural, and consumer products.

Pomona, CA

Based in Pomona, CA, Performance Engineered Products manufactures custom, injection molded plastics. They offer mold manufacturing, reverse engineering, and complex plastic component assembly, including sonic welding. The company serves highly technical industries such as Aerospace, Defense, Automotive, Life Sciences, and Medical Devices.

Dixon, KY

Pioneer Plastics, based in Dixon, KY, specializes in American-made custom plastic injection molding for Original Equipment Manufacturers (OEMs). The company offers services from design consultation to production, focusing on delivering high-quality, on-time, and on-budget custom plastic parts. They emphasize ensuring optimal fit and function for all components.

This company specializes in the design and creation of custom molds. They utilize these molds to produce high-quality plastic parts precisely according to client specifications. Their services cater to various clients requiring custom plastic components and products, ensuring precision and quality in manufacturing.

Hudson, MA

Based in Hudson, MA, Plastic Molding Manufacturing is a U.S.-based custom plastic injection molding company. They provide full-service solutions, including design-for-manufacturing support, precision tooling, insert, and two-shot molding. They offer scalable production for diverse industries, notably medical, with ISO 8 cleanroom capabilities and manage tool transfers.

Delray Beach, FL

Based in Delray Beach, Florida, Plastimold Products is a plastic injection molding company with over 22 years of experience. They provide services including engineering, tooling, injection molding, and assembly for custom plastic components.

Thousand Oaks, CA

Based in Thousand Oaks, CA, Polymation provides injection-molded plastics. The company designs, builds, and mass produces plastic components, offering comprehensive plastic injection molding services. They serve various industries, including medical, dental, and commercial, producing parts and components for client equipment needs.

Santa Fe Springs, CA

Based in Santa Fe Springs, CA, Polymershapes provides custom plastic fabrication and molding services. Capabilities include CNC and laser processing, thermoforming, and plastic molding. The company also distributes plastic sheets, rods, tubes, and film, offering material conversion for custom plastic product manufacturing needs.

Upland, CA

Precision Molded Plastics, Inc. is a plastic injection molding company that builds custom molds, tooling, and manufactures parts. It provides value-added services for clients in medical, aerospace, food and beverage, construction, and agriculture industries, committed to environmental preservation and recycling.

Marion, SC

PSI Molded Plastics is a custom injection molder providing small to large molded parts. They specialize in structural foam molding and gas assist molding, offering capabilities like post-mold finishing, value-add assembly, and custom color matching. With manufacturing locations in South Carolina, Indiana, and New Hampshire, they support both low and high volume requirements for diverse customer needs.

Fredericksburg, OH

Based in Fredericksburg, OH, Quality Plastics LLC specializes in custom injection molding. They offer versatile solutions encompassing engineering, prototyping, assembly, and packaging, utilizing their capabilities to provide comprehensive services for custom plastic products.

Quantum Plastics is a global supplier specializing in custom injection molding, blow molding, and assembly services. They handle projects requiring tight tolerances and complex geometries, delivering quality solutions. The company serves various sectors, including the Automotive and Appliance industries.

Seattle, WA

Based in Seattle, WA, Quickparts provides custom plastic injection molding services. Their extensive capabilities also include CNC machining, stereolithography (SLA), selective laser sintering (SLS), cast urethane, direct metal printing (DMP), sheet metal, die casting, and rapid prototyping, offering diverse manufacturing solutions.

Rage Plastics provides comprehensive custom plastic manufacturing solutions, including injection molding and injection stretch blow-molding. They offer extensive engineering services, from product design and material selection to mold building and production planning, ensuring high-quality, high-precision product manufacturing and exceeding customer expectations.

Houston, TX

Based in Houston, TX, RMC Plastics specializes in custom injection molding services, manufacturing precision plastic and rubber molded parts. The company assists clients with design, tooling, and material selection. Serving diverse sectors including consumer products, oil & gas, medical, and electric utility, RMC Plastics produces high-quality, made-in-the-USA products.

Toledo, OH

Based in Toledo, OH, SeaGate Plastics specializes in providing custom plastic solutions, including custom and standard extrusions, injection molded components, CNC machining, fabrication, and assembly. Founded in 1987, the company serves industrial, packaging, construction, and OEM customers with in-house tooling and engineering support.

Kearney, NE

Springboard Manufacturing specializes in custom plastic injection molding for medical devices. Based in Kearney, NE, the company offers a full range of plastic molding capabilities, including overmolding and insert molding. They efficiently mass-produce parts using diverse thermoplastic materials, operating as an ISO 13485:2016 certified provider.

Manvel, TX

Southwest Quality Molding, based in Manvel, TX, provides custom tight tolerance injection molding services. The company manufactures quality thermoplastics, producing custom plastic parts for short and long runs. They serve diverse government and commercial clients across industries including oil, energy, automotive, and packaging.

Shelby Township, MI

Summit Plastic Molding provides full-service custom injection molding from 85 to 1000 ton. Based in Shelby Township, MI, they specialize in prototyping and production for the automotive, medical, and defense sectors. Their capabilities encompass engineering, tooling, and manufacturing, supported by facilities in Michigan, Texas, and China.

Yakima, WA

Tamarack Industries, based in Yakima, WA, provides custom plastic injection molding services for businesses across California and the West Coast. They offer fast turnaround, full-service production, and no minimums, producing durable, consistent plastic parts. The company also specializes in custom thermoforming.

Kenton, OH

Based in Kenton, OH, Pleasant Precision, Inc. provides contract manufacturing services for the plastic industry. The company offers injection molding, mold making, and extrusion capabilities, supporting clients from product design to finished molded products. They aim to deliver high-quality parts.

Macomb, MI

PTI Engineered Plastics, based in Macomb, MI, specializes in custom plastic injection molding for low to medium volume production. They serve the medical, defense, electronic, and consumer device industries. The company provides in-house tooling, scientific molding processes, a Class 8 cleanroom, and engineering support from concept to production.

Houston, TX

Based in Houston, TX, TechStar Molding specializes in custom plastic injection molding services. Their capabilities encompass design support, prototyping, precision tooling, high-quality molding, and value-added services like assembly, packaging, and logistics. They serve businesses of all sizes, offering solutions for new tooling development or running existing molds.

Baraboo, WI

Teel Plastics provides custom plastic products, offering extrusion for tubing, piping, and profiles, alongside injection molding services. Based in Baraboo, WI, capabilities include new product design and custom compounding for various resins. They serve diverse industries such as medical devices, cosmetics, industrial pipe, and water treatment.

Corona, CA

Based in Corona, CA, TNT Plastic Molding is a manufacturer of custom plastic molded parts. The company specializes in injection mold tooling, custom injection molding, and insert molding. They offer engineering expertise and contract manufacturing, including fully-staffed assembly and finishing operations, dedicated to mission-critical applications.

Trenton, TX

Based in Trenton, TX, Trenton Plastics specializes in custom injection, transfer, and compression molding for plastic and rubber products. They process various materials, from standard to engineered resins. The company provides molding solutions to diverse industries, including aerospace, defense, oil & gas, telecom, electronics, medical, and food & drug sectors.

Valley View, TX

Based in Valley View, TX, T&R Tooling provides end-to-end plastic injection molding and custom tooling services. They offer design, DFM optimization, prototyping, and production. Capabilities include mold building, repair, transfer, post-molding services, assembly, and inventory stocking for complete plastic part manufacturing.

Texas Injection Molding specializes in supplying engineering grade plastic parts. They provide custom plastic molding solutions for manufacturers and end-use product companies, delivering precise components tailored to specific industry needs and supporting diverse production requirements.

Cleveland, OH

Based in Cleveland, OH, USA Injection Molding is a full-service plastic injection molding facility. They provide prototype design, manufacturing, and fulfillment services. The company designs, manufactures, and distributes plastic components within the USA, offering competitive prices for custom projects.

Valencia, CA

Based in Valencia, CA, Valencia Plastics Inc. manufactures custom plastic injection and blow molded products. They specialize in high-volume production of parts and containers, including HDPE wide-mouth canisters. The company utilizes up to 100% post-consumer resin and food-grade materials like Eco Prime / Envision for their manufacturing processes.

Sunnyvale, CA

Based in Sunnyvale, CA, WeCutFoam offers custom mold making services to reproduce objects in large quantities. They utilize molds, sometimes made from plastics, for fabricating products from polyurethane, silicone rubber, concrete, plaster, and foam. Services support diverse applications, from prototypes to consumer goods.

Russells Point, OH

World Class Plastics Inc., based in Russells Point, OH, specializes in precision injection molding. They offer engineering, design, and in-house tool and mold building, utilizing highly automated processes. Value-added services include assembly, pad printing, ultrasonic staking, and insert molding for diverse industrial applications.

Homestead, FL

YIJIN Solution offers comprehensive rapid prototyping and manufacturing services, specializing in custom plastic injection molding. Capabilities range from tooling to mass production for diverse industries. Additional services include CNC machining, 3D printing, sheet metal fabrication, and vacuum casting to meet various project requirements.

Houston, TX

Based in Houston, TX, Blackwell Plastics specializes in custom injection molding and plastic extrusion for OEM manufacturers. They provide engineering grade thermoplastic resins, supporting projects from design to fulfillment with in-house tooling, assembly, and finishing. Industries served include Life Sciences, Industrial, Electronics, Energy, and Aerospace.

Imlay City, MI

Based in Imlay City, MI, MSI provides plastic injection molding and CNC machining services. They manufacture custom plastic and metal parts, with all tooling and production handled in-house in the USA. MSI is ITAR and ISO 9001 certified, offering a reliable single source for custom part manufacturing.

PCBWay provides online injection molding services, specializing in rapid molds and production tooling. They offer custom molded prototypes and production parts, emphasizing fast lead times for various project needs.

RYD Tooling specializes in custom plastic injection molding services. They provide comprehensive solutions, encompassing parts design, prototyping for injection molding, and precision injection mold making. The company manufactures plastic injection molded products, offering robust capabilities for diverse client needs.

Hopkins, MN

TPM specializes in precision injection molding, providing custom solutions for components with tight tolerance and complex geometry. The company offers injection, 2-shot, insert, and thermoset molding services, along with automated assembly and testing. They serve diverse markets including automotive, consumer, industrial, small engine, packaging, and medical sectors.

Holiday City, OH

20/20 Custom Molded Plastics provides custom plastic molding solutions, specializing in high and low pressure injection molding. Their capabilities include structural foam, structural web/gas assist, engineering, tooling, and quality assurance. They focus on product development for cost reduction and superior part performance, operating from facilities in Ohio, Indiana, and Georgia.

Kerrville, TX

Based in Kerrville, TX, All-Plastics provides comprehensive plastic injection molding and assembly solutions to customers. Their technical team focuses on delivering quality and on-time delivery for various demands. The company offers precision plastics solutions and utilizes scientific molding techniques in its manufacturing facility.

Boerne, TX

Based in Boerne, TX, Bee Jay Molding Inc. is a family-owned company that specializes in custom-injected plastic components. They provide comprehensive post-production services including ultrasonic welding, assembly, and packaging for various plastic products.

Paterson, NJ

Based in Paterson, NJ, Bennett Plastics specializes in custom plastic injection molding. With over 40 years of experience, the company provides high-quality, U.S.-made plastic parts. They offer comprehensive molding services for custom components, leveraging their extensive manufacturing expertise.

Cadrex is a contract manufacturer that provides custom plastic injection molding solutions. The company specializes in serving OEM's, offering expertise in various stages of the manufacturing process and delivering tailored plastic components designed for industrial applications.

Ontario, CA

Based in Ontario, CA, California Quality Plastics offers custom plastic manufacturing and fabrication. Its Bel-Air Cases division specializes in durable, custom ABS plastic shipping and carrying cases with extensive customization options. Anything Plastic provides custom plastic items for entertainment, OEM, and military applications, alongside general fabrication services.

Irvine, CA

Based in Irvine, CA, California Sealing Solutions provides custom plastic injection molding services, including gas assist, insert, and overmolding. They also offer plastic extrusion and secondary operations such as ultrasonic welding, milling, and painting to deliver greater value for various plastic parts.

Houston, TX

Based in Houston, TX, Coastal Plastics Molding, Inc. is a family-owned company offering custom plastic injection molding and thermoplastic parts since 1984. They provide in-house design engineering, tooling, quality inspection, and assembly services. The company utilizes a modern 180-ton JSW all-electric molding machine for precise production.

Custom Molded Products LLC provides turnkey injection molding services, handling projects from prototype to high-volume production. They specialize in two-shot molding, PVC molding, and overmolding, operating 34 molding machines. The company also offers assembly, pad printing, packaging, and inventory services, solving complex injection molding challenges for various industries.

Red Lion, PA

Based in Red Lion, PA, Custom Molds and Plastics has operated since 1984 as a plastic injection molding company. They provide comprehensive services for plastic injection molding needs, emphasizing consistent customer satisfaction and clear communication with clients. The company focuses on quality and customer service.

Salisbury, NC

Based in Salisbury, NC, Custom Plastic Forming specializes in both heavy- and thin-gauge custom thermoforming services. The company offers turnkey plastic forming solutions, including design, engineering, 3D printing, toolmaking, CNC routing, and fabrication. They work with various materials like Kydex, PETG, HIPS, and ABS, serving applications such as medical packaging and assembly trays.

Cedar Grove, NJ

Emco Industrial Plastics, Inc. offers custom injection molding services for various applications. Additionally, they provide extensive custom plastics fabrication, including CNC machining, laser cutting, plastic welding, and thermoforming of plastic and rubber components. Serving industries such as aerospace, automotive, medical, and OEM, they deliver custom solutions nationwide.

Akron, OH

Based in Akron, Ohio, Ferriot Inc. is a full-service contract manufacturer providing custom injection molding services. The company offers structural foam molding, engineering, supply chain management, decorating, and final assembly. They manufacture a variety of custom plastic molded parts that American consumers interact with daily.

Rittman, OH

Based in Rittman, OH, J&O Plastics offers custom injection molding, specializing in clear plastic products. They work with materials like PET, acrylic, polypropylene, SAN, and PVC for consumer, medical, industrial, and agricultural clients. Comprehensive services include assembly, labeling, packaging, inventory management, and direct shipping to major retailers.

Costa Mesa, CA

Based in Costa Mesa, CA, JG Plastics Group LLC provides custom plastic injection molding, tooling, and assembly services. Operating since 1975, their facility includes Class 10,000 cleanrooms. They hold ISO 13485, ISO 9001, AS 9100, ITAR, and FDA compliance for regulated industries.

Barberton, OH

Based in Barberton, OH, Ohio Precision Molding, Inc. specializes in custom plastic injection molding. Services include product design, engineering, prototyping, rapid tooling, 3D printing, and full production. They offer material selection, short run manufacturing, assembly, and molded parts decorating for diverse industries.

Plastics Plus Technology provides close-tolerance custom plastic injection molding and value-added services, including secondary operations, packaging, and mold making. This woman-owned, USA contract manufacturer serves medical, automotive, dental, and electronic component industries. They are ISO 9001:2015, ISO 13485:2016 certified, and FDA registered.

Eagle, WI

Based in Eagle, WI, Plastic Molded Concepts, Inc. specializes in custom plastic injection molding. The company is recognized for its expertise in molding engineered resins, providing specialized solutions for various industrial applications. They offer comprehensive services, focusing on precision and quality in their manufacturing processes.

Rapid Molding provides on-demand manufacturing for custom plastic injection molded parts, from prototypes to high-volume production. They offer prototype, bridge, and rapid production molding, integrating features like sharp corners with EDM, undercuts, threaded holes, insert, and over molding for high-quality, timely component delivery.

Hatfield, PA

Based in Hatfield, PA, The Rodon Group specializes in high-volume custom plastic injection molding. The company provides high-quality, low-cost manufacturing solutions, delivering efficient and precise production of custom plastic components through advanced injection molding processes for various applications.

Glendora, CA

Based in Glendora, CA, Southwest Plastics specializes in custom plastic molding services. The company offers precision thermoplastic injection molding, thermoset molding, transfer molding, and compression molding. They manufacture durable, high-performance components and precise, resilient parts for demanding applications, utilizing a range of plastic molding capabilities.

Spectrum Plastics Group specializes in custom plastic injection molding solutions for complex, tight-tolerance projects. They produce premium, high-quality components and fully assembled medical devices using highly engineered performance medical plastics. The company serves various medical applications, including orthopedic, dental, and gastrointestinal.

Norco, CA

Based in Norco, CA, SR Plastics provides custom injection molding services, utilizing engineered plastic and thermoplastic rubber materials. They offer in-house secondary operations, including sonic welding, over molding, hot stamping, and assemblies. They serve Aerospace, Medical, and Fuel Management Systems industries, adhering to AS9100 and ISO:9100 quality standards.

Fort Worth, TX

Based in Fort Worth, TX, Superior Plastics specializes in custom plastic injection molding and mold building services. With over 34 years of experience, they provide precision manufacturing, drop shipping, and private labeling for industries such as electronics, industrial, military, oil field, and telecommunications. The company holds ISO 9001:2015, AS9100D, and ITAR certifications.

Houston, TX

Based in Houston, TX, Texas Injection Molding provides custom plastic injection molding services, offering product design assistance and engineering. They serve OEM manufacturing and consumer product markets across diverse sectors like electronics, food & beverage, medical, energy, and industrial safety, focusing on defect-free product delivery.

Avon Lake, OH

Based in Avon Lake, Ohio, Thogus is an established custom plastic injection molder and contract manufacturer founded in 1950. The company specializes in manufacturing plastic parts, guiding clients through material selection, part design, and tooling solutions. They offer insert molding, overmolding, and two-shot molding for medium-to-high volume production programs.

Shelbyville, IN

Based in Shelbyville, IN, Thunderbird Molding specializes in high-precision custom plastic injection molding and contract manufacturing. They offer comprehensive services including mold design, prototyping, engineering, production, and assembly. The company focuses on realizing cost improvements and accelerating market entry for clients.

Holyoke, MA

Universal Plastics, based in Holyoke, MA, specializes in custom plastic molding, offering injection molding (gas assist, structural foam), thermoforming, and blow molding services. They serve medical, aerospace, transportation, and general industrial markets. The company provides in-house painting, secondary operations, and assembly, utilizing a range of tonnage presses for diverse project needs.

Newton Falls, OH

Based in Newton Falls, OH, Venture Plastics, Inc. provides injection molding solutions from two modern facilities in Ohio and Texas. They serve diverse markets including industrial/consumer, major appliance, automotive, and communications. Services extend to part design, program management, global tool sourcing, quality control, and value-added finishing and assembly.

Livermore, CA

Westec Plastics is an ISO 13485:2016 certified plastic injection molding organization located in Livermore, CA. They specialize in custom injection molding, mold building, 3D printed tooling, and clean room services. The company serves industries including medical, aerospace, consumer products, and electronics.

Beacon MedTech Solutions manufactures precision plastic injection molding components. The company serves leaders in the Medical, Bio-Pharma, Aerospace, Defense, and Electronics industries, providing custom solutions for specialized applications.

California Plastics supplies a comprehensive range of engineering, specialty, and commodity thermoplastics, including additives and color concentrates. The company also offers custom plastic solutions, serving various industries with its diverse material portfolio and supporting specialized manufacturing requirements.

Fresno, CA

Based in Fresno, CA, Country Plastics specializes in custom injection molding services. The company provides expertise in injection mold design, injection molding, and CNC machining. They also offer solutions for biodegradable molds, catering to various manufacturing needs.

Madison, SD

Falcon Plastics specializes in mid-to-high volume plastic injection molding, delivering quality custom plastic parts. Serving industries such as medical, agricultural, and recreational, the company provides precision manufacturing solutions. They focus on producing components tailored to specific client specifications for various demanding applications.

Methuen, MA

Based in Methuen, MA, New England Plastics Corp. provides custom plastic manufacturing and fabrication services. Established in 1946, the company focuses on producing custom plastic components and assemblies, leveraging extensive experience to meet a variety of client specifications and project requirements.

Plastic Molding Technology provides custom plastic molding services, specializing in complex plastic insert molding. The company utilizes custom automation cells, advanced robotics, vertical injection molding, and rotary table molding techniques to deliver its plastic solutions.

Precision Plastic Products Inc. provides custom plastic injection molding, delivering precision molds and parts for critical sectors. Serving industries like medical, military, aerospace, and lighting, they specialize in tough-to-mold engineered materials such as PEEK and AMODEL. An in-house toolroom supports production with CNC machining and 3D design.

Reliant Plastics specializes in injection molded plastics, offering expertise in metal to plastic conversions. The company addresses client challenges throughout the entire plastics life cycle, providing comprehensive solutions for various custom molding requirements.

Structural Foam Molding specializes in custom plastic molding, primarily utilizing low-pressure injection molding techniques. The company operates multiple production facilities across Ohio, Indiana, and Georgia, providing comprehensive manufacturing solutions for diverse client needs.

Welch Plastics operates as a plastic manufacturer, providing custom plastic fabrication solutions. The company specializes in manufacturing various plastic components, offering tailored solutions for diverse industrial applications. Their focus is on delivering high-quality production and fabrication processes for specific client requirements.

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How to Choose a Company

  • Verify their press tonnage aligns with your part's projected size and material requirements, and inquire about their capabilities for specialized processes like gas-assist molding, insert molding, or in-mold labeling if your design dictates.
  • Assess their engineering team's experience with Design for Manufacturability (DFM) and their ability to provide critical feedback on gate location, wall thickness uniformity, and potential for sink marks or warpage before tool build begins.
  • For highly regulated industries, insist on specific certifications such as ISO 13485 for medical devices or IATF 16949 for automotive components, and confirm their adherence to any necessary material traceability or lot control protocols.
  • Clarify upfront the terms of tooling ownership, who is responsible for mold maintenance, repair, and storage, and whether they have in-house tool making capabilities or rely solely on external mold builders.
  • Beware of suppliers who quote an exceptionally low piece price without thoroughly reviewing your 3D models or engaging in DFM discussions, as this often indicates a lack of understanding of your part's complexities or a hidden agenda for future change orders during the tool build phase.
  • Evaluate their specific experience with the engineering resins or commodity thermoplastics you're considering. A molder's proficiency with specialty materials like PEEK, Ultem, or highly filled compounds can drastically impact part quality and yield.

Frequently Asked Questions

Should I own my injection mold tooling, or should the molder?

This is a critical decision. Owning the tooling provides flexibility to move production to another molder if necessary, but you bear the upfront cost and responsibility for major repairs. If the molder owns it, the cost is often amortized into piece price, potentially locking you in but shifting maintenance burden. Always secure a detailed tooling quote, even if the molder owns it, to understand its true cost and value.

What is Design for Manufacturability (DFM) in custom plastic molding, and why is it important?

DFM in custom plastic molding is the process of optimizing a part's design to make it easier, more cost-effective, and more reliable to manufacture via injection molding. It involves critical considerations like wall thickness, draft angles, rib placement, and gate location to prevent defects, reduce cycle times, and minimize tooling costs. Engaging in DFM early with your molder prevents costly redesigns and tool modifications down the line.

What are common challenges when switching custom plastic molding suppliers, and how can they be mitigated?

Switching suppliers can be complex, especially if the original tooling is involved. Challenges include qualifying existing tooling on a new press, matching color and finish specifications, and ensuring consistent part quality. Mitigate these by thoroughly documenting the current process, conducting a First Article Inspection (FAI) with the new molder, and considering a 'soft launch' or parallel production if feasible. A robust mold transfer protocol is essential.

How do I ensure material quality and traceability for my molded parts?

Insist on material Certificates of Conformance (CoCs) for every lot of resin used, verifying it meets your specified grade and properties. For critical applications, discuss lot traceability and resin batch retention policies with your molder. This ensures that in the event of a quality issue, the material source can be pinpointed and isolated.

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