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Last updated: January 2026
This directory lists 39 transfer molding companies across the United States, from specialists in micro-encapsulation for MEMS and medical devices to high-volume industrial molders producing robust electrical components and automotive sensors.
Buyers engage these specialized manufacturers to solve specific engineering challenges, such as achieving superior environmental protection for sensitive components, ensuring high dielectric strength in electrical insulators, or providing critical vibration damping. This often involves intricate designs requiring tight tolerance control, precise gate locations to minimize shear stress on delicate inserts, and advanced degassing techniques to eliminate trapped air and achieve a void-free finish in thermoset resins.
The supplier types in this niche vary significantly. Some focus almost exclusively on epoxy or silicone encapsulation for electronics, often featuring cleanroom environments and highly automated lines. Others specialize in molding high-performance phenolics or other engineering thermosets for structural or high-temperature applications. You'll also find facilities with extensive in-house tooling capabilities versus those that partner with external tool shops, impacting lead times and design iteration cycles.
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39 companies nationwide
ADDMAN Group specializes in transfer molding for complex electronic assemblies, supporting low to medium volume production. Based in Statesville, NC, they integrate additive manufacturing, CNC machining, and injection molding. Serving critical sectors like defense, aerospace, medical, and energy, ADDMAN simplifies supply chains.
CORE Molding Technologies is a US-based manufacturer specializing in fiberglass reinforced plastics and sheet molding compound (SMC). They provide diverse molding capabilities, including Resin Transfer Molding (RTM), Compression Molding, and Direct Long Fiber Thermoplastic (D-LFT). They produce large, complex components for various industrial markets.
Based in Dayton, OH, CTC Plastics specializes in custom molding services, utilizing inexpensive tooling at low pressures for simple and complex parts, ideal for flatter products. They also manufacture plastic pallets and help companies achieve sustainability goals through a closed-loop recycling process, upcycling plastic waste into new products.
Based in Newburyport, MA, Dapro Rubber specializes in custom molding components to client specifications. They work with a broad spectrum of materials, including buna rubber, butyl rubber, fluorosilicone, natural rubber, synthetic rubbers, silicones, plastics, and TPE, providing tailored solutions for diverse industrial applications.
Based in Ramsey, MN, Dynamic Group specializes in precision medical molds and advanced molding services. The company is a trusted manufacturer of medical devices, offering comprehensive solutions from innovative design to accelerated delivery. They serve the medical industry with their specialized tooling and molding capabilities.
Based in Corona, CA, Elastomer Technologies, Inc. specializes in customer-tailored elastomer molding and die-cutting. They provide comprehensive manufacturing capabilities, including compression, prototype, injection, and direct transfer molding services. Since 1975, ETI has delivered high-quality engineered parts and cost-effective solutions.
Based in Gainesville, TX, K&D Custom Molding is a manufacturing company specializing in custom plastic molding services. The facility is equipped with 200-600 ton machines and offers comprehensive capabilities including assembly and various second operations for industrial clients.
King Epoxy Emblem Co. Ltd, based in Pomona, CA, specializes in diverse custom manufacturing for industrial clients. They offer plastic injection molding, silicone rubber keypads, nameplates, emblems, graphic overlays, and membrane switches. Additional services include metal stamping, in-mold decoration, and value-added assembly solutions.
Mar-Bal, based in Painesville, OH, is a custom molder of thermoset composite components. With over 50 years of experience, they provide vertically integrated services including material formulation, design, and manufacturing. Mar-Bal offers cost-effective molding solutions and expert materials engineering from its in-house R&D facility.
Based in Manitowoc, WI, MCM Composites, LLC specializes in thermoset plastic injection, compression, and transfer molding services. They manufacture high-quality, complex parts for various industries, including aerospace, electronics, appliance, food and beverage, furniture, and medical applications.
Based in Fort Worth, TX, Micro Mold Plastics USA Inc. provides precision plastic molding services. Holding ISO 9001:2015 and AS9100D certifications, plus DDTC registration, they cater to demanding industries like aerospace and defense. The company emphasizes 'Quality Before Quantity' in its manufacturing operations.
Osborne Industries, based in Osborne, KS, specializes in custom resin transfer molding. The company provides innovative answers for a variety of plastics challenges, offering dedicated manufacturing services to meet specific client needs in diverse industrial applications.
Based in Smithfield, NC, Penn Compression Moulding, Inc. specializes in injection, compression, and transfer molding of high-performance thermoset composites. The company offers custom molding services for industries including appliance safety devices, electrical/electronic, oil & gas, defense/aerospace, and medical applications.
Based in Rockland, MA, Polymer Corporation specializes in providing liquid resin casting services for low-volume applications. Their manufacturing process offers a fast, flexible, and attractive alternative to injection molding, ideal for clients requiring specialized polymer component solutions.
Based in Carson City, NV, REDCO is a 100% USA-owned manufacturer specializing in custom transfer molded rubber products. They provide custom rubber molding, rubber-to-metal bonding, die cutting, and rubber rollers. Serving diverse industries since 1948, REDCO delivers high-quality rubber parts manufactured to precise client specifications.
Based in Minneapolis, MN, Robinson Rubber Products Company, Inc. is an ISO 9001:2015 certified custom molding manufacturer of elastomeric and thermoplastic components and assemblies. They offer extensive capabilities including custom rubber molding, insert and overmolding, and liquid silicone rubber (LSR) solutions, providing design assistance and value-added services like assembly and packaging.
Based in Bruce Township, MI, Romeo RIM specializes in custom Resin Transfer Molding (RTM) and Reaction Injection Molding (RIM) solutions. The company provides composite manufacturing for diverse industries, including agricultural, heavy truck, medical, construction, marine, and industrial equipment, offering complete program management from design to production.
Based in South Gate, CA, L.W. Reinhold Plastics provides custom Thermoset and Thermoplastic molding services. Capabilities include Injection Molding and Compression Transfer Molding up to 300 tons. They also offer product development, engineering, prototyping, and low production. The company is ISO 9001:2015 certified and ITAR registered.
Based in Rogers, MN, Solidify MFG specializes in high-volume plastic part molding. They provide transfer, compression, and injection thermoset molding services, adept with materials including SMC, BMC, TMC, and granular compounds. The company uses precision molding and advanced automation to manage supply chains for diverse industrial partners.
Stockwell Elastomerics, based in Philadelphia, PA, specializes in custom gaskets and high-performance silicone rubber solutions. The company provides custom rubber compression molding services for the demanding technology equipment sector, offering expertise in material selection, prototyping, and engineering support for sealing and cushioning applications.
Based in Trenton, TX, Trenton Plastics provides customized plastic and rubber molding solutions, specializing in injection, transfer, and compression molding. The company serves diverse industries including aerospace, defense, oil & gas, medical, and electronics, offering both standard and engineered resins for custom parts.
Hi-Tech Mold & Engineering, Inc. based in Rochester Hills, MI, specializes in engineering and mold making. They are a full-service provider of plastic injection molded components, offering diverse molding capabilities such as injection-compression, gas assist, and low-pressure molding. They serve automotive, defense, medical, and aerospace industries.
Based in Worcester, MA, Jefferson Rubber Works, Inc. is a USA manufacturer specializing in custom molded rubber parts, including transfer molding, since 1975. They utilize advanced mold-making techniques and a wide range of materials to provide precision-machined, high-quality rubber products for diverse industrial applications and client needs.
Based in Montoursville, PA, Ralph S. Alberts Co. Inc. is a full-service custom molder. They offer flexible tooling and diverse molding techniques for custom parts, specializing in cast epoxy, silicone, and urethane materials. The company provides cost-effective, accurate solutions and fast delivery, collaborating on product design and manufacturing.
Silicon Gasket provides advanced molding services for Liquid Silicone Rubber (LSR), handling materials from 0 to 80 shore A. The company specializes in creating custom LSR components, including overmolding plastic and metal inserts. They leverage specialized molding technology to deliver high-precision solutions for industrial clients.
Based in Hopkins, MN, TPM provides precision molding solutions, specializing in injection, 2-shot, insert, and thermoset molding. The company also offers automated assembly and decorative finishing services. TPM serves diverse markets including automotive, medical, industrial, consumer, and packaging.
Davies Molding is a U.S. plastic molder specializing in custom injection, compression, and transfer molding for thermoplastic and thermoset parts. Serving industrial OEMs since 1933, this ISO 9001 certified, women-owned company delivers precision components for sectors like Defense, Medical, and Transportation.
Based in Menands, NY, Extreme Molding provides customized compression and transfer molding services for plastics and silicone, with a focus on high-performance silicones. The company manufactures products for consumer, life science, healthcare, and pet supply markets. They offer a full-service model, including molding, assembly, packaging, and fulfillment.
Based in Hartland, WI, Fathom provides contract manufacturing services with decades of experience in insert injection molding applications. They specialize in high-precision solutions for complex geometries and critical components, serving industries like Aerospace & Defense, Medical, Automation & Robotics, Semiconductor, and Automotive & EV.
Based in Costa Mesa, CA, JG Plastics Group LLC offers both thermoset and thermoplastic molding processes. They apply scientific molding principles and extensive experience to construct tooling for demanding, close tolerance parts. Specializing in mold making and injection molding, they provide comprehensive manufacturing solutions.
Lone Star Molding specializes in custom compression molding and plastic injection molding, providing high-quality parts. They utilize advanced materials like PTFE, HNBR, and Kevlar® for exceptional wear and temperature characteristics. The company also features an in-house machine shop for mold making and machining inserts.
Based in Bloomfield, NJ, Minor Rubber Company manufactures precision-engineered molded and extruded rubber parts. They offer transfer molding services, ensuring consistent, high-quality components, especially those with inserts. Trusted by OEMs, Minor Rubber supplies durable rubber components for demanding industrial applications across various sectors.
Petersen Molding Corporation is a manufacturing company based in Norwalk, CA, specializing in various molding processes. They provide custom molded components for industrial and commercial clients, offering expertise in different molding technologies, including transfer molding, to meet specific customer requirements.
PPD Polymer Process Development, LLC specializes in engineering and manufacturing polymer solutions, primarily for automotive applications. They offer comprehensive services including advanced glass encapsulation, injection molding, and assembly. PPD also provides prototyping, 3D printing, and finishing services to deliver high-quality products faster, leveraging experienced engineering.
Southwest Plastics, based in Glendora, CA, offers precision transfer molding services, supporting both short-run and high-volume production with custom tooling. They specialize in durable, high-performance thermoset components for demanding applications. The company also provides compression molding and thermoplastic injection molding capabilities.
Sur-Seal manufactures custom engineered components, specializing in injection, compression, and transfer molding services. Capabilities also include precision die-cutting, extruding, and water jet cutting. Certified AS9100 and ISO9001, the company provides high-quality manufacturing solutions for diverse industrial needs.
Based in Houston, TX, Thermo-Mold Inc. specializes in custom mold making, tooling, and design for the plastics and rubber industries. They fabricate various mold types, including transfer molds, and provide comprehensive services from engineering to prototype and low-volume production.
Based in Anaheim, CA, Konark Silicones specializes in engineering and producing high-quality molded silicone rubber parts. Their expertise includes compression molding silicone and liquid silicone injection molding (LIM), alongside comprehensive project management from part design to production.
Based in Fremont, CA, Viant is a global medical device contract manufacturer providing design, development, and manufacturing capabilities. The company specializes in interventional and inhalation devices, offering comprehensive solutions for complex challenges within the MedTech industry through advanced plastic manufacturing processes.
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Achieving void-free parts and consistent density in transfer molding relies heavily on optimized mold design, precise material preparation, and rigorous process control. Key factors include effective degassing of the resin, appropriate gate and runner design to ensure uniform material flow and minimize turbulence, controlled mold temperatures, and precise injection pressure and ram speed profiles. Some advanced molders utilize vacuum assist during the molding cycle to actively pull air out of the cavity, further enhancing part integrity.
Lead times for transfer molding tooling can range from 8-16 weeks, depending on complexity, number of cavities, and required precision. While similar to injection molding tooling for intricate parts, transfer molding tools often have distinct requirements for heating (platen heaters), material delivery (transfer pot and ram), and venting strategies specific to thermosets. Factors like the need for flashless tooling designs and specialized steel selection for abrasive filled resins can also influence the lead time and cost, generally making highly precise, multi-cavity transfer tools a significant investment.
Flashless transfer molding, often achieved with precisely matched mold halves and specialized tooling, is critical for applications where minimizing post-mold cleanup, maintaining tight dimensional tolerances, and protecting delicate inserts (like lead frames or sensitive electronics) are paramount. Traditional gating, while potentially simpler for basic parts, often results in flash that requires secondary deflashing operations, adding cost and potentially compromising part integrity or cosmetic appearance. For high-volume production of complex or sensitive components, the upfront investment in flashless tooling is usually justified by reduced per-part cost and superior quality.