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Overmolding Companies

Last updated: January 2026

This directory lists 107 overmolding companies across the United States, from dedicated multi-shot specialists to full-service contract manufacturers offering integrated assembly solutions.

Buyers in this category are typically solving problems like creating sealed enclosures for sensitive electronics, adding ergonomic and vibration-dampening grips to medical instruments, or integrating wear-resistant surfaces into industrial controls. This often involves navigating complex challenges in material adhesion, ensuring perfect shut-off areas to prevent material flash, and optimizing cycle times for multi-shot molding processes.

Suppliers in this space range significantly. You'll find highly specialized custom molders focusing purely on complex two-shot or insert molding, to larger facilities that can handle both the rigid substrate injection molding and the subsequent overmolding operation. Some even offer comprehensive post-molding assembly and testing for complete sub-assemblies, providing a turnkey solution for intricate components.

To get the most accurate quotes and ensure project success, buyers should prepare detailed 3D CAD models for both the substrate and the overmold material, specify critical bonding surfaces, provide comprehensive material datasheets, and clearly define all expected cosmetic and functional requirements. Suppliers will expect to review these details thoroughly to provide constructive design for manufacturability (DFM) feedback.

A significant trend shaping the overmolding industry is the increasing demand for sustainable overmold materials, including bio-based TPEs and recycled content resins, driven by both consumer and regulatory pressures. There's also continued advancement in liquid silicone rubber (LSR) overmolding, particularly for critical sealing, medical, and high-temperature applications due to its excellent material properties.

107 companies·67 emails·90 phones

Company Directory

107 companies nationwide

Chatsworth, CA

Based in Chatsworth, CA, A & S Mold & Die Corporation specializes in custom plastic injection molding, offering insert molding and overmolding services. The company provides full mold design, building, and repair capabilities. With 46 molding machines ranging from 22 to 1200 tons, they process diverse materials including polyester, nylon, and PEEK, adhering to ISO 9001:2015 standards.

Anaheim, CA

Based in Anaheim, CA, Action Mold & Tool, Inc. specializes in high-quality plastic injection molding services. The company provides custom plastic injection molded parts, including advanced overmolding and insert molding solutions. They also offer tooling, mold design, and engineering expertise for various industries.

Woodstock, IL

Based in Woodstock, IL, AdvanTech Plastics, LLC specializes in full-service plastic injection molding. Capabilities include insert molding and two-shot injection molding, a core overmolding process. They serve medical, industrial, electronic, and packaging industries, providing comprehensive manufacturing solutions for diverse product needs.

Based in Kulpsville, PA, Aline Components, Inc. provides custom thermoplastic injection molding, specializing in two-shot molds, a process used for overmolding. This full-service manufacturer handles projects from concept to finished product in-house. They offer rapid prototypes, tooling, and various thermoplastic materials for diverse industries.

Los Angeles, CA

Ames Rubber Manufacturing is a custom rubber product manufacturer based in Los Angeles, CA. With over 70 years of experience, they specialize in molded, extruded, die-cut, and lathe-cut rubber gaskets, seals, and components. They assist engineers with material selection and elastomer integration for diverse applications.

Houston, TX

Based in Houston, TX, American Medical Molding LLC specializes in complex overmolding for medical devices, wearables, and surgical tools. They are ISO 13485 certified and operate a Class 8 cleanroom, offering material selection, tooling oversight, automation, and secondary operations for high and low volume production.

Salt Lake City, UT

Based in Salt Lake City, UT, Biomerics is a contract manufacturer specializing in overmolding services. They produce high-quality, high-volume overmolded metal and plastic products for complex interventional components and medical devices using vertical and rotary presses. Capabilities span design to finished devices.

Houston, TX

Blackwell Plastics, LP is a custom plastic injection molding company based in Houston, TX. Specializing in overmolding, insert molding, and part design, they offer comprehensive manufacturing solutions. Services include prototyping, tooling, and value-added options like assembly and packaging for various industries.

Gardena, CA

California Custom Cables, based in Gardena, CA, provides custom cable assemblies and wire harnesses. They offer in-house overmolding services for connectors and custom strain reliefs, enhancing durability and environmental sealing. This capability supports specialized cable features and branding for B2B clients across various industries.

Irvine, CA

Based in Irvine, CA, California Sealing Solutions, Inc. specializes in custom parts and sealing components. The company provides plastic injection molding, custom molded rubber, metal stampings, and machined metal parts. They offer design engineering services, guiding projects from concept to production using diverse materials.

Based in Meadville, PA, C&J Industries offers high-precision plastic injection molding and contract manufacturing services. They specialize in two-shot molding (overmolding), alongside assembly, welding, and laser etching. Serving medical, automotive, and technology sectors, the company is ISO 13485:2016 and FDA registered.

Brea, CA

Based in Brea, CA, Contech Plastics provides custom plastic injection molding services. The company offers a complete line of services to guide client ideas from concept to production, specializing in comprehensive manufacturing solutions.

Based in Freedom, PA, Crescent Industries specializes in plastic overmolding, custom injection molding, and tooling services. The company provides comprehensive manufacturing solutions, from design to post-molding, for the medical, military, and industrial/OEM markets.

Franklin, WI

Custom Fabricate (CFS), based in Franklin, WI, provides custom rubber molding services, including silicone transfer and compression molding. They produce custom Santoprene moldings and also offer die-cut gaskets, seals, and industrial masking solutions. As an ISO 9001:2015 supplier, CFS serves finishers and OEMs.

Dapro Rubber, based in Newburyport, MA, specializes in two-shot plastic molding, a key process for overmolding, to produce a diverse range of custom plastic parts. Their capabilities include manufacturing critical components such as gaskets, seals, and various other functional plastic parts for industrial and commercial applications.

Georgetown, TX

Based in Georgetown, TX, Detail Mold & Manufacturing specializes in comprehensive molding and manufacturing services. With over 30 years of experience, the company offers expertise from tool design and mold validation through to full production runs. They partner with clients to ensure high-quality outcomes for each project.

Anaheim, CA

DPI Plastics specializes in precision plastic injection molding and overmolding services. Based in Anaheim, California, they offer complete project management from design to tool build, material selection, and high-volume production. Their overmolding process enhances products with improved grip, impact absorption, and wear properties for diverse industrial applications.

Based in Bedford, MA, EpecTec specializes in manufacturing custom overmolded cables. These engineered cables are designed for extreme durability and feature IP67/IP68 sealing. The company offers both offshore and domestic production capabilities, serving critical applications in the defense, medical, and industrial sectors.

Brownsville, TX

Based in Brownsville, TX, Exel Bobbins & Plastic Components specializes in custom molded plastics, offering two-shot injection molding services. With over 20 years of experience, the company provides turnkey tooling and product development, troubleshooting designs and optimizing mold yields. They operate a lean manufacturing environment to lower customer costs.

Mchenry, IL

Based in McHenry, IL, Fabrik Molded Plastics, Inc. provides custom plastic injection molding, specializing in insert molding and two-shot injection molding. They leverage scientific molding to produce multi-material and multi-component parts for industries including automotive, healthcare, electronics, and consumer-industrial markets.

Rancho Cucamonga, CA

Based in Rancho Cucamonga, CA, SyBridge Technologies engineers injection molding tooling and provides comprehensive manufacturing solutions, including overmolding. They support tooling needs from concept to high-volume production, partnering with OEMs and contract manufacturers across various industries with a global presence.

Bad Axe, MI

Based in Bad Axe, MI, Gemini Group manufactures engineered plastic products for top OEMs and suppliers. They specialize in two-shot injection molding, ideal for complex, multi-material, and multi-color plastic components, including overmolding. The company also offers profile extrusion and technical blow molding services, alongside essential metal tooling solutions.

Based in Woburn, MA, Greene Rubber Company designs, prototypes, and manufactures precision-molded components. Specializing in rubber molding and over-molding services, they provide solutions for sealing, vibration, and thermal management. The company serves mission-critical systems across aerospace, defense, medical, and electronics industries.

Riverside, CA

Based in Riverside, CA, Hi-Rel Plastics & Molding, Inc. provides custom plastic injection and blow molding services. With over 40 years of experience, they hold ISO 9001, AS 9100, and ISO 13485 certifications, operating an ISO 7 clean room. The company serves major industries, offering part evaluation, 3D printing, and prototyping solutions.

Hartland, WI

Based in Hartland, WI, ICOMold specializes in plastic injection molding, offering overmolding services to produce parts with both hard and soft areas. They also provide rapid tooling, CNC machining, urethane casting, and compression molding for diverse industrial applications. The company operates US facilities in Wisconsin and Arizona.

Huntsville, AL

Based in Huntsville, AL, American Precision Products is a custom injection molding firm specializing in thermoplastics, thermoplastic elastomers, and thermoset materials. They offer insert molding with highly controlled specifications for commercial, aerospace, government, military, energy, and critical OEM applications.

Oxnard, CA

JW Molding, Inc. is a Southern California-based custom injection molder specializing in high-tolerance, precision plastic parts. They offer insert molding services, employing scientific molding techniques and ISO 9001 quality systems. The company serves industries like medical, electronics, and aerospace, providing comprehensive solutions from design to assembly.

Mankato, MN

Based in Mankato, MN, Kato Cable provides specialized cable overmolding services. They enhance the strength, protection, and appearance of cable assemblies using thermoplastic materials, serving various industrial applications.

Brea, CA

Based in Brea, CA, Kingson Mold and Machine Inc. specializes in liquid silicone rubber (LSR) mold making and manufacturing solutions. They serve diverse sectors including medical, aerospace, automotive, electronic, and consumer industries. Services span part design, tooling design, prototyping, and production tooling, ensuring precision and quality for various applications.

San Jose, CA

Based in San Jose, CA, MOS Plastics Inc. specializes in high-precision plastic injection molding and contract manufacturing. Services include prototyping, assembly, and secondary operations. The company caters to demanding industries such as healthcare, medical devices, diagnostics, pharmaceuticals, electronics, and automotive, providing custom solutions.

LPMS USA provides comprehensive low pressure molding solutions from design to production, specializing in precise, waterproof encapsulation for electronics. They offer contract manufacturing services, tooling, and a wide range of molding equipment. The company also distributes overmolding materials from brands like Henkel and Bostik.

Sheridan, WY

Based in Sheridan, WY, LS Manufacturing provides professional custom overmolding services, precisely bonding soft elastomers onto rigid plastic substrates. The company also offers a range of other manufacturing solutions including CNC machining, 3D printing, sheet metal fabrication, and injection molding. They support rapid prototyping and high-volume production, ensuring ISO 9001 certified quality.

Torrance, CA

Based in Torrance, CA, Lynn Products Inc. specializes in custom molding, wire harnesses, and cable assemblies for OEM and custom applications. They produce molded cables and components for diverse industries, including gaming, medical, control, test equipment, communications, and handheld devices, offering design assistance.

Majors Plastics, Inc. provides extensive injection overmolding services for various product and engineering requirements. Specializing in injection, two-shot, and clean room molding, the company offers comprehensive manufacturing solutions. It features on-site engineering and a tool room, maintaining ISO 9001 quality assurance.

Middlefield, OH

Based in Middlefield, OH, Mercury Plastics LLC specializes in injection overmolding, profile extrusion, and custom thermoplastic fabrication. The company serves diverse markets including appliance, automotive, and medical with PFAS-free manufacturing. They also operate captive electron beam processing facilities for products and outside customers.

Dallas, TX

Based in Dallas, TX, Meridian Products Corporation is an ISO 9001:2015 certified custom injection molder. They specialize in fabricating over-molded components like bearings, connectors, and medical parts. Providing tooling, design, and assembly, they serve aerospace, automotive, medical, and electronics industries with a wide range of thermoplastic materials.

Santa Ana, CA

Santa Ana, CA-based Merit Cables Inc. specializes in custom overmolded cable assemblies. With 40 years of expertise, they provide manufacturing solutions for Medical, Commercial, Defense, and Industrial OEMs. Delivers high-quality, quick-turn production meeting ISO 13485 standards.

Arlington, TX

Metro Custom Plastics, based in Arlington, TX, specializes in conventional plastic injection molding and contract manufacturing. Operating a 14-machine, 24-hour shop, they handle prototype and large production orders. Their capabilities include 230-560 ton clamping forces, shot sizes up to 80 ounces, and a range of materials. Engineering consultation is also provided.

MJM Industries is a U.S.-based custom contract manufacturer specializing in high-quality overmolded cable and wire harness assemblies. They offer solutions for M8/M12 connectors, wire leads, and encapsulated components. Capabilities include injection/insert molding, robotic soldering, ultrasonic welding, and product design, ensuring reliable performance across diverse environments.

Bedford, OH

Molding Dynamics Inc., based in Bedford, OH, is an experienced plastics injection molder specializing in high-quality, close-tolerance components. They offer comprehensive services including overmolding, insert molding, assembly, engineering, and tooling. Serving medical, electronics, consumer goods, industrial, and automotive sectors, they provide custom plastic solutions.

Lancaster, NY

Based in Lancaster, NY, Moldtech is a North American developer and manufacturer specializing in innovative custom rubber molded products. They provide high-quality rubber overmolding and rubber injection molding services, alongside thermoset, sponge/foam, LSR/HCR silicone, compression, and micro molding capabilities. Moldtech serves various industries with vertically integrated solutions.

Lake Geneva, WI

MPM Plastics, based in Lake Geneva, WI, specializes in custom plastic injection molding services. An ISO 9001:2015 certified company with 40 years of experience, they focus on tight tolerance and precision plastic parts. An onsite tool room supports custom mold creation with over 40 machines.

San Martin, CA

Based in San Martin, CA, Newline Rubber Company custom manufactures precision molded rubber parts and components. They serve established and emerging technologies and industries, including electronics and computers. Adhering to stringent quality standards, their expertise provides comprehensive rubber molding services for various industrial applications.

Chino, CA

Based in Chino, CA, Norco Plastics, Inc. provides custom plastic injection molding services, specializing in large tonnage capacity up to 2800 tons. The company offers 24/7 production, end-to-end manufacturing, and secondary operations. Industries served include automotive, medical, and consumer products.

Irvine, CA

Based in Irvine, CA, Novalink Systems specializes in the manufacturing of custom cable assemblies and wire harnesses. They provide tailored solutions, often incorporating processes like overmolding for robust strain relief, environmental protection, and custom connector designs, serving diverse industrial and commercial needs.

Canal Winchester, OH

Olan Plastics, Inc. in Canal Winchester, OH, offers injection and insert molding for various industries. With over 40 years of experience, they utilize multiple machines from 85-ton to 610-ton capacities, processing diverse resins and rubber. Services include subassembly, consulting, and warehousing.

Mentor, OH

Based in Mentor, OH, Overmold Express is a contract manufacturer providing overmolding and encapsulation services. With 40 years of experience, they specialize in protecting delicate electronic components. They offer LPO, TSO, potting, and encapsulation from prototyping to full production.

OvermoldTooling, a US manufacturer and division of ISC Engineering, provides custom overmold solutions. They specialize in complex custom cables, PCB integrated electronics, and strain relief. Offering molded cable assemblies with rapid prototyping and quick turn production, they serve OEMs in medical, electronics, automotive, and industrial markets.

Based in Hudson, MA, Plastic Molding Manufacturing is a U.S.-based custom plastic injection molding company. They provide full-service, single-source solutions, specializing in insert molding and two-shot molding (overmolding). Capabilities include DFM support, precision tooling, and scalable production, serving diverse industries with medical/ISO 8 clean room facilities.

Delray Beach, FL

Based in Delray Beach, FL, Plastimold Products specializes in custom plastic injection molding and comprehensive overmolding services. They offer two-shot molding, material selection, and design assistance for creating seamless, multi-material components. The company serves industrial clients using materials such as TPE, TPU, and nylon.

Van Nuys, CA

Based in Van Nuys, CA, Precision Molds & Molding Co. offers full-service custom plastic injection molding. With over three decades of expertise, they manage projects from conceptualization and design through final mold development and production. The company emphasizes unmatched quality, customization, and reliable delivery for client product needs.

Polycraft Tech, now part of Innova Engineered Plastics, provides overmolding services to create custom molded urethane components. These solutions are designed to enhance durability, comfort, and functionality. They serve critical, highly regulated industries including Medical Device & Life Sciences and Aerospace & Defense, offering engineered plastic enclosures and assemblies.

Upland, CA

Based in Upland, CA, Precision Molded Plastics specializes in comprehensive plastic injection molding services. The company provides expert overmolding, insert molding, and custom tooling solutions. With ISO 9001:2015 certification, they offer full-service capabilities from engineering to assembly for various industrial applications.

Santa Fe Springs, CA

RD Rubber Technology Corp. manufactures custom precision molded rubber parts, specializing in various molding techniques including compression, transfer, and injection molding. They excel in overmolding services, specifically offering robust rubber to metal bonding and silicone to plastic bonding. The company supports industries like aerospace, defense, and medical device equipment.

Houston, TX

Based in Houston, TX, RMC Plastics specializes in custom injection molding services, producing precision plastic and rubber parts. They offer planning, design, tooling, and manufacturing for nationwide clients. RMC Plastics serves diverse sectors including Consumer Products, Oil & Gas, Medical, and Construction.

Minneapolis, MN

Robinson Rubber Products Company, Inc., an ISO 9001:2015 certified custom molding manufacturer in Minneapolis, MN, specializes in elastomeric and thermoplastic components. They provide extensive insert and overmolding capabilities, processing diverse materials from metals to engineering plastics.

Rochester, NH

Based in Rochester, NH, The Rubber Group specializes in overmolding, integrating rubber with materials like plastics and metals to create high-performance components. They engineer custom rubber compounds and tight-tolerance parts for mission-critical applications. Serving aerospace & defense, electrical T&D, and process control, they are ISO 9001:2015 and ITAR certified.

Miramar, FL

Based in Miramar, FL, Simtec Silicone Parts specializes in high-quality liquid silicone rubber (LSR) multi-shot molded components. They provide custom solutions for LSR injection molding and multi-shot overmolding, serving the medical, healthcare, mobility, consumer, and industrial industries.

Kearney, NE

Springboard Manufacturing, based in Kearney, NE, specializes in plastic injection molding services for medical devices. They offer a full range of plastic molding capabilities, explicitly including overmolding and insert molding solutions. Working with diverse thermoplastics, this ISO 13485:2016 certified company provides custom medical molding with a focus on precision and efficiency.

Macomb, MI

PTI Engineered Plastics, based in Macomb, MI, is a direct provider of overmolding and plastic injection molding services. They offer comprehensive manufacturing solutions with in-house tooling, scientific molding, and Class 8 cleanroom capabilities. Serving OEM professionals in medical, defense, and consumer device industries, PTI manages products from concept to production.

Riverside, CA

Based in Riverside, CA, Trademark Plastics, Inc. is a vertically integrated contract manufacturer specializing in high-precision injection molding. They operate 51 machines from 6-610 tons in a 100,000 sq. ft. facility with cleanrooms, providing turnkey solutions and prototypes primarily for the healthcare industry.

Foothill Ranch, CA

Based in Foothill Ranch, CA, TRS International Manufacturing, Inc. offers custom cable assembly and wire harness manufacturing. The company provides overmolded cable assemblies, discrete wire harnesses, and turnkey solutions. They serve diverse markets including aerospace, medical apparatus, and automotive electronics.

Turnersville, NJ

CDM Incorporated provides comprehensive rubber overmolding services, utilizing premium materials such as EPDM, Viton®, and Neoprene. They also offer low smoke/zero halogen options, specializing in durable and seamless cable applications for commercial and industrial clients.

Based in Malvern, PA, Saint-Gobain offers advanced silicone overmolding solutions tailored for medical devices. The company enhances product durability, ergonomics, and chemical resistance through precise material integration. They specialize in custom overmolded components, leveraging extensive expertise to meet the stringent performance requirements of the medical industry.

Santa Ana, CA

Based in Santa Ana, CA, Supreme Mold & Molding Inc. specializes in plastic injection molding, including overmolding and insert molding. They provide comprehensive services from custom tooling and prototyping to high-volume production and assembly. Serving industrial, medical, automotive, and consumer markets.

Houston, TX

Based in Houston, TX, XACT Technologies USA specializes in designing and manufacturing custom cable and product solutions. The company provides precision engineering for complex components, offering custom cable assemblies with overmolding capabilities. They serve diverse industries, including military applications.

Clinton Twp, MI

Based in Clinton Twp, MI, Xcentric Mold & Engineering offers direct overmolding services, including plastic-on-plastic, plastic-on-metal, and wire overmolding. They also provide rapid injection molding, CNC machining, and additive manufacturing. Operating from Michigan facilities, Xcentric supports projects from prototyping to production for diverse industrial clients.

Grand Rapids, MI

Based in Grand Rapids, MI, Agapé Plastics is an American, woman-owned company with over 50 years of experience in custom plastic injection molding and insert-molded products. They provide creatively engineered solutions, offering services like post-mold assembly, value-added operations, and engineering support for various industries.

Schiller Park, IL

Amerline specializes in robust, customized cable assemblies and circular connectors, leveraging extensive overmolding expertise. Serving military, automotive, medical, industrial, and commercial sectors, the company delivers high-reliability connections designed to withstand harsh environments. They apply military-grade standards to all products.

Based in Sterling, MA, BMP Medical specializes in custom medical plastics manufacturing for OEMs. The company offers injection molding, injection blow molding, and precision manufacturing and assembly services. With over 45 years of experience, they partner with clients to co-develop scalable, high-quality components.

Consolidated Electronic Wire & Cable provides custom electronic wire and cable products, specializing in molded cable assemblies. These overmolded assemblies offer enhanced strain relief and suitability for diverse environments. They also supply power cords, retractile cords, and wiring harnesses for various electronic applications.

Fallbrook, CA

Based in Fallbrook, CA, CORD Industries specializes in plastic injection molding, including insert and overmolding services. With experience since 1975, they also provide product design, prototyping, mold design, assembly, and packaging. They offer competitive pricing and dedicated customer service from prototype to production, without high minimum orders.

Carol Stream, IL

Davies Molding, based in Carol Stream, IL, provides custom injection, compression, and transfer molding for thermoplastic and thermoset parts. They specialize in insert-molded knobs and handles, including soft-touch grips, serving industrial OEMs in defense, medical, and transportation with precision component solutions.

Deforest, WI

EVCO Plastics is a custom plastic overmolding and injection molding provider. With multiple facilities across the United States, including DeForest, WI, Oshkosh, WI, and Calhoun, GA, the company collaborates with clients on projects from concept to completion.

Menands, NY

Based in Menands, NY, Extreme Molding specializes in overmolding services for plastic and silicone components. The company provides silicone injection molding, assembly, packaging, and fulfillment for high-end consumer, life science, healthcare, and pet products. They partner with businesses in the US, Canada, and Europe.

Hartland, WI

Fathom is a U.S. contract manufacturer specializing in advanced manufacturing solutions, including two-shot molding (overmolding) and bi-injection rotary tools. They provide high-precision services tailored to customer specifications, serving industries such as Aerospace & Defense, Medical, Automotive & EV, Automation & Robotics, and Semiconductor.

Forum Contract Manufacturing specializes in complex injection molding services, including overmolding, insert molding, and micro molding. With over 30 years of experience, they provide ISO Class 7 cleanroom molding, assembly, and quick-turn prototyping for the medical industry and other sectors, supporting projects from concept to production.

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 parts, including defense and electrical connectors. Utilizing scientific molding principles and extensive experience, they offer advanced injection molding solutions often encompassing overmolding applications.

Manitowoc, WI

Kaysun Corporation, Inc. provides custom injection molding services for complex applications, emphasizing engineered excellence and sustainable practices. They offer advanced manufacturing solutions for various industries from their facility in Wisconsin.

Conroe, TX

Based in Conroe, TX, Lone Star Molding offers custom injection molding and overmolding services. They specialize in over molding and bonding to metals, utilizing high-performance polymers such as PTFE and Kevlar. An in-house machine shop supports precise mold and bonding insert production.

Brea, CA

Based in Brea, CA, M.R. Mold & Engineering specializes in designing and manufacturing liquid silicone rubber (LSR) and plastic injection molds. Services include overmolding, micro molding, and insert molds, supported by their state-of-the-art Tech Center. They cater to OEMs and job shop molders.

Norwalk, CA

Petersen Molding Corporation, based in Norwalk, CA, specializes in custom plastic injection molding and overmolding services. They provide comprehensive manufacturing solutions, encompassing prototyping, tooling, production, and assembly. Serving various industries, Petersen Molding delivers high-quality molded components from their US facility.

Eagle, WI

Plastic Molded Concepts, Inc., based in Eagle, WI, is a plastic injection molding company specializing in molding engineered resins. They provide comprehensive injection molding services, including capabilities for overmolding, serving various industries with custom plastic components.

Ravenna, OH

Qualiform, LLC is a U.S. custom rubber molding company providing various services including compression, injection, and transfer molding. They specialize in rubber-to-metal and rubber-to-plastic bonding, offering critical capabilities for diverse overmolding applications. The company manufactures specialized rubber components for industrial clients.

Glendora, CA

Southwest Plastics, based in Glendora, CA, provides comprehensive plastic molding services for industrial and commercial customers. Specializing in thermoset molding, thermoplastic injection molding, transfer molding, and compression molding, the company delivers durable, high-performance components tailored for demanding applications.

Spectrum Plastics specializes in contract manufacturing for the medical device industry, offering comprehensive solutions from product ideas to final production. The company provides applications expertise in areas like extruded tubing, catheter technologies, and medical balloons, enhancing each step in the manufacturing process with capabilities that include overmolding.

Norco, CA

SR Plastics, based in Norco, CA, is a 50-year veteran in injection molding, offering customizable services. They specialize in in-house overmolding, sonic welding, and machining for precision plastic products. Using engineered materials, SR Plastics serves aerospace, medical, and industrial sectors, meeting stringent tolerance requirements.

Brownsville, TX

Based in Brownsville, TX, Standard Mold USA is a full-service supplier specializing in plastic injection molded products. The company also provides comprehensive tool manufacturing and repair services, holding ISO 9001:2015 and IATF 16949 certifications.

Fort Worth, TX

Superior Plastics provides custom plastic injection molding services, including mold building and tooling. They offer a range of capabilities from 42-ton to 400-ton presses, working with commodity, engineering, and high-temperature resins. Serving the electronics, industrial, military, and telecommunications sectors, the company is ISO 9001:2015, AS9100D, and ITAR registered.

Houston, TX

Based in Houston, TX, Texas Injection Molding provides custom plastic injection molding services for OEM manufacturing and consumer products. They offer product design assistance and engineering services, utilizing modern injection molding equipment to deliver defect-free products to customers.

Houston, TX

Based in Houston, Texas, Thermo-Mold Inc. specializes in custom plastic injection mold building and high-quality plastic injection molding services. They offer diverse molding techniques, including standard injection molding, insert molding, and overmolding. Serving various industries since 1980, Thermo-Mold provides comprehensive solutions from concept to production, encompassing assembly and packaging.

San Diego, CA

Based in San Diego, CA, ARRK North America, Inc. offers comprehensive product development services, from rapid prototyping to full production. Specializing in custom manufacturing, they possess expertise in various materials, including those for overmolding processes, supporting clients in bringing products to market.

Velosity offers custom contract manufacturing, specializing in injection molding, micro molding, precision machining, and tool building. Serving medical device and defense manufacturers, the company provides end-to-end solutions for complex, highly regulated applications, focusing on quality and precision.

Livermore, CA

Based in Livermore, CA, Westec Plastics Corporation is an ISO 13485 certified organization specializing in plastic injection molding and secondary operations. Established in 1969, they provide mold building, 3D printed tooling, and clean room manufacturing for medical, aerospace, consumer, and electronics.

Sweetwater, TX

West Texas Molding, based in Sweetwater, Texas, is a plastic injection molding business and a subsidiary of Ludlum Measurements, Inc. They serve customers from entrepreneurs to established companies, offering prompt service for small volume runs with quick turn-around, alongside experience in large-scale production projects.

Kerrville, TX

Based in Kerrville, TX, All-Plastics, LLC is a custom plastic injection molding company. They specialize in diverse molding processes including overmolding, insert molding, and two-shot molding. The company provides design assistance, tooling, and secondary operations, serving various industrial clients with comprehensive manufacturing solutions.

Jacksonville, TX

Based in Jacksonville, TX, D & L Tooling & Plastics Inc. specializes in custom plastic injection molding and precision tooling. The company offers comprehensive services including overmolding, insert molding, and value-added assembly, serving diverse industrial clients. They operate a modern 36,000 sq ft facility for manufacturing plastic components.

Brookings, SD

Falcon Plastics, based in Brookings, SD, specializes in mid-to-high volume plastic injection molding, explicitly offering overmolding services. The company delivers quality plastic parts and assemblies for diverse sectors, including medical, agricultural, and recreational industries. With multiple US facilities, Falcon Plastics combines materials for specialized applications.

ISC specializes in custom cable overmolding services, leveraging an in-house tooling group to create bespoke solutions. They also offer the option to adapt existing or standard overmolds to fit diverse needs, providing efficient and cost-effective production for various applications.

Anaheim, CA

Based in Anaheim, CA, Konark Silicone Technologies specializes in engineering silicone part design and high-quality silicone parts production. The company offers silicone injection molding, silicone compression molding, and complete project management for complex silicone rubber components, serving various industries.

Penn United Technologies Inc. offers over 35 years of expertise in reliable mold design and comprehensive injection molding solutions. They specialize in efficient, high-quality manufacturing, providing custom molding capabilities and progressive stamping dies. The company supports various industrial clients with their precise tooling and production needs.

El Paso, TX

Based in El Paso, TX, Plastic Molding Technology is a custom plastic injection molder. The company specializes in advanced manufacturing services, including overmolding, two-shot molding, and liquid silicone rubber (LSR) molding. They offer comprehensive solutions for complex plastic components, serving diverse industrial applications.

Gainesville, TX

Based in Gainesville, TX, Reliant Plastics is a custom plastic injection molder specializing in overmolding, insert molding, and assembly services. The company provides comprehensive solutions for designing and manufacturing high-quality plastic components. They also offer prototyping, tooling, and various value-added services for diverse industries.

Northbrook, IL

Rogan Corporation, based in Northbrook, IL, specializes in custom plastic injection molding, prominently offering 2-shot molding and overmolding services. They combine multiple materials or colors in a single process to deliver robust, high-quality parts. The company also provides insert molding, precision machining, and assembly.

South El Monte, CA

Based in South El Monte, CA, R&R Rubber Molding, Inc. specializes in custom molded rubber products. They provide compression, transfer, and injection molding services, crucially offering rubber to metal bonding, a direct form of overmolding. Serving automotive, aerospace, and medical industries, they handle projects from prototype to high-volume production.

Gardena, CA

Based in Gardena, CA, Techni-Mold & Engineering Inc. provides precision plastic injection molding services. Their capabilities include overmolding, insert molding, and custom tooling, alongside comprehensive engineering support. They offer manufacturing solutions from design to production for various industries.

Viant is a manufacturing partner specializing in medical device design and production. The company works with OEMs to deliver advanced interventional and inhalation device solutions, tackling complex challenges with extensive manufacturing capabilities and a global operational network.

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How to Choose a Company

  • Be wary of suppliers who dismiss the importance of a detailed Material Adhesion Test Plan or claim 'any TPE will stick to any ABS.' Proper bonding requires specific material grades, surface preparation, and precise process control, which should be explicitly discussed and validated through actual testing.
  • Verify the supplier's experience with your specific overmold material and substrate combination. For instance, if you require a liquid silicone rubber (LSR) overmold onto a PBT connector, ensure they have dedicated LSR molding capabilities and a proven track record for robust chemical adhesion with that exact pairing.
  • For medical device components, insist on ISO 13485 certification, and for automotive parts, require IATF 16949. These certifications indicate rigorous quality systems crucial for critical overmolded applications like surgical tool grips or sensor housings, ensuring traceability and process control.
  • Review their DFM (Design for Manufacturability) feedback specifically regarding shut-off areas, draft angles on the substrate for overmold ejection, and potential sink marks caused by material thickness differentials. An experienced supplier will highlight tooling complexities and potential cost drivers for multi-shot or highly precise insert molding.

Frequently Asked Questions

What are the key factors for achieving robust material adhesion in overmolding, and how can I specify them?

Achieving robust adhesion in overmolding primarily relies on material compatibility (chemical bonding), mechanical interlock (design features), and proper surface energy. You should specify material grades that are known to bond well to your substrate, design textured surfaces or undercuts for mechanical grip, and ensure the supplier has processes for surface activation if required. In your quality plan, require specific pull-test or shear-test values to validate adhesion.

When should I consider multi-shot (two-shot) molding versus a traditional insert molding process for an overmolded part?

Multi-shot (or two-shot) molding is ideal for high-volume production of complex parts where precision and aesthetic quality are paramount, as it eliminates secondary operations and improves consistency by molding both materials in one machine cycle. Insert molding, while potentially offering lower upfront tooling cost, is generally better suited for lower volumes, simpler geometries, or when the 'insert' is a non-plastic component (e.g., metal, electronics) that cannot withstand the multi-shot process temperature or environment.

What design considerations are critical for 'shut-off areas' in overmolding to prevent flash and ensure part integrity?

Shut-off areas are crucial surfaces where the overmold material needs to stop precisely, preventing material flow into unwanted regions. They require crisp, well-defined edges on the substrate, appropriate draft angles (typically 3-5 degrees) on the mold tools to allow clean separation, and sufficient land area for the mold halves to seal without crushing the substrate. Poor shut-off design often leads to flash, material bleed, or cosmetic defects, increasing scrap rates and secondary operations.

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