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Rubber Molding Companies

Last updated: January 2026

This directory lists 85 rubber molding companies across the United States, from job shops to vertically integrated manufacturers.

Buyers navigating the rubber molding landscape are typically solving critical problems related to sealing, vibration isolation, fluid transfer, or ergonomic interfacing. They need parts that can withstand extreme temperatures, specific chemical exposures, or repeated cycles without degradation. Technical challenges often revolve around achieving precise durometer values for tactile feedback, minimizing flash without damaging critical sealing surfaces, or ensuring consistent material flow in intricate molds, especially when dealing with overmolding or Liquid Silicone Rubber (LSR).

The ecosystem of rubber molding suppliers ranges from small, highly specialized shops focusing on niche materials or rapid prototyping, to large, vertically integrated enterprises serving high-volume, regulated industries. Some excel in compression molding for robust, simple geometries, while others specialize in injection molding for complex, high-precision parts or offer dedicated LSR capabilities. Distinctions also lie in their in-house tooling capabilities, secondary operations like deflashing or bonding, and engineering support for design for manufacturability (DFM) reviews.

Successful engagement with a rubber molding company hinges on robust upfront preparation. Buyers should arrive with detailed 2D and 3D CAD files, material specifications (including polymer type, shore hardness, and any specific additives), target volumes, and clear performance requirements for the application. Suppliers expect to see critical dimensions, tolerance callouts, and information on the operating environment to accurately quote and suggest optimal molding processes and tooling strategies.

A significant trend reshaping the rubber molding industry is the increasing demand for advanced engineering elastomers and multi-material solutions. As product designs become more sophisticated, there's a growing need for parts that combine rubber with plastics or metals (overmolding), driven by miniaturization and enhanced functional integration. Furthermore, sustainability initiatives are prompting greater interest in recycled elastomers and processes that minimize scrap and energy consumption, pushing molders to innovate their material science and manufacturing footprints.

85 companies·60 emails·74 phones

Company Directory

85 companies nationwide

Kennedale, TX

Ace Rubber Products, Inc. is a custom manufacturer based in Kennedale, TX, specializing in rubber molded parts and rubber-to-metal bonding. They provide stock and custom rubber products, including vacuum cups, retaining rings, and custom gaskets, meeting various industrial specifications and MIL-I-45208 quality standards.

Tinley Park, IL

Based in Tinley Park, IL, Aero Rubber specializes in developing custom molded rubber parts. With 50 years of experience, the company focuses on delivering high-quality products and superior customer experience. They are committed to meeting deadlines and providing cost-effective solutions for various rubber molding needs.

Portland, CT

Based in Portland, CT, Airex Rubber Products Corp. specializes in custom rubber molding, high-performance elastomer products, rubber-to-metal bonding, and precision molding. They provide design expertise for the aerospace, defense, medical, oil exploration, and commercial industries. The company is AS9100 and ISO9001 certified.

Chesterfield, IN

Based in Chesterfield, IN, American Rubber Corp manufactures custom and standard rubber components. The company provides customized rubber extrusions, O-rings, and molded components, including diaphragms and gaskets. They offer precision manufacturing from die design to mass production.

Cherry Hill, NJ

Based in Cherry Hill, NJ, American Rubber Products manufactures engineered elastomers, including advanced silicone sponge technology and rubber coated fabrics. They provide state-of-the-art manufacturing capabilities for molded parts and extrusions. The company serves various critical applications in industries like aerospace and automotive.

Los Angeles, CA

Based in Los Angeles, CA, Ames Rubber Manufacturing offers custom rubber product manufacturing with over 70 years of experience. Services include molding, extrusion, die cutting, and lathe cutting for rubber gaskets, seals, and components. They also assist engineers with material selection and component geometry for elastomeric needs.

Plano, TX

Based in Plano, TX, Astro-Tex Company, Inc. manufactures custom rubber products and components. They offer expertise in molded parts and custom extrusions, supporting prototype tooling and large production runs. Astro-Tex serves various sectors including Medical, Agriculture, Oil & Gas, Mining, and Construction.

Long Beach, CA

Based in Long Beach, CA, Rubbercraft Corporation of California manufactures custom rubber products. They specialize in rubber-to-metal bonding, employing injection, transfer, and compression molding techniques. The company supplies vibration control mounts, isolators, gaskets, and seals for aerospace, defense, medical, and industrial applications.

Long Beach, CA

Bryant Rubber Corporation, established in 1971 and headquartered in Long Beach, CA, provides high-quality, tight-tolerance precision molded components. The company leverages extensive engineering expertise to develop custom rubber solutions, focusing on complex, precision-engineered parts for various industries.

Ivanhoe, VA

Based in Ivanhoe, VA, CMD Inc produces molded rubber parts using materials such as silicone, neoprene, and EPDM. The company focuses on precision and consistency, leveraging over 25 years of industry experience to deliver custom solutions.

Bakersfield, CA

Based in Bakersfield, CA, Century Rubber Company, Inc. manufactures custom molded and die-cut elastomer products, specializing in rubber-to-metal vulcanized components. They utilize compression, transfer, and injection molding processes for various materials. This ISO 9001:2008 and ITAR compliant company serves aerospace, defense, medical, electronic, consumer, and automotive industries.

Diamond Bar, CA

Based in Diamond Bar, CA, Coi Rubber Products, Inc. is a rubber molding manufacturer specializing in custom rubber and plastic products. They utilize techniques such as molding, extrusion, and rubber-to-metal bonding, serving industries including Automotive, Industrial, and Food Processing.

Core Molding Technologies specializes in molding large surface and structural components using advanced techniques. They are experts in working with both thermoplastic and thermoset materials, providing comprehensive manufacturing services for diverse industrial applications.

Kyle, TX

Based in Kyle, TX, CPI Rubber Molding specializes in custom design, compression, transfer, and injection molding services. They work with materials like Silicone, Viton, EPDM, and Nitrile. Serving industries including Oil & Gas, Military, and Construction, they offer in-house tooling and custom rubber mixing.

Cleveland, OH

Based in Cleveland, OH, Custom Rubber Corporation specializes in the design and molding of custom rubber products. The company provides injection molding and compression molding services for quality molded rubber components. They are committed to a responsive customer experience from design to on-time delivery.

Addison, IL

Based in Addison, IL, Custom Rubber Molders, Inc. manufactures high-quality molded rubber and silicone products. The company specializes in precision bonding of rubber to metal, holding close tolerances on complex parts. They offer prototype capabilities and handle various production runs with dependable service.

Broken Arrow, OK

Based in Broken Arrow, OK, Da/Pro Rubber, Inc. specializes in custom molded precision rubber parts. With over 40 years of experience, the company provides components to international markets. They offer comprehensive services, including material selection, design, and prototyping, from their multiple US facilities in Oklahoma and Massachusetts.

New Berlin, WI

Dynatect, through its Ro-Lab division, specializes in custom rubber molding services. The company utilizes over 75 presses, ranging from 40-2500 tons with platen sizes up to 20x50 feet. Capabilities include in-house Banbury mixing for custom compounds and expertise in rubber compression molding for small to large-scale parts.

Van, TX

Based in Van, TX, East Texas Seals, LLC specializes in custom molding elastomeric and rubber parts for prototyping and production. They offer compound development, specialty coatings, and material testing services. The company provides packers for diverse downhole environments, assisting with engineering and design for custom rubber products.

Corona, CA

Based in Corona, CA, Elastomer Technologies, Inc. offers rubber molding and die cutting services for various applications. The company specializes in converting uncured rubber compounds into finished products using processes like compression molding, often in FDA-compliant clean room environments. They serve both local and global clients.

Orange, CA

Based in Orange, CA, West American Rubber Company, LLC manufactures and supplies a comprehensive range of extruded, sheet, and molded rubber products. They offer seals, gaskets, profiles, tubing, cords, and custom rubber components from over 4,000 compounds including EPDM, silicone, and natural rubber for various industries.

Rancho Cucamonga, CA

Based in Rancho Cucamonga, CA, Goodyear Rubber delivers custom rubber molding, extrusion, mixing, and calendaring services. They provide tailored rubber solutions for industries like aerospace, automotive, defense, and food and beverage, enhancing performance and reliability.

Kansas City, MO

Based in Kansas City, MO, Hanna Rubber Company manufactures and distributes a comprehensive line of industrial rubber products. They provide molded rubber parts, molded hoses, extrusions, sheet rubber, and gasket materials. The company serves industrial, construction, automotive, military, and government customers.

Lodi, CA

Based in Lodi, CA, Holz Rubber provides custom molded rubber products and services with over 80 years of experience. They offer engineering and business solutions, utilizing manufacturing capabilities like injection, compression, and transfer molding. The company works with various polymers including NBR, FKM, EPDM, and SBR.

Cicero, IN

Based in Cicero, IN, Iris Rubber Company, Inc. specializes in custom rubber molding, leveraging over five decades of experience. They employ compression and transfer molding for medical, agricultural, aerospace, and military applications. Capabilities include fabricating rubber products with metal or non-metal inserts, cryogenic de-flashing, and rubber to metal bonding.

Valencia, CA

Based in Valencia, CA, LMP manufactures high-quality, precision molded rubber products and parts. They specialize in compression and transfer molding of high-performance elastomers like Silicone, Vitons, and Nitrile. Services include high precision mold making and rubber to metal bonding, serving aerospace, automotive, and biomedical industries.

Brownwood, TX

Based in Brownwood, TX, Lone Star Rubber provides custom-designed and manufactured rubber and plastic parts. They specialize in precision custom rubber molding, offering tool design, production design, and testing services. The company develops engineered rubber products, with extensive experience in the oilfield rubber and plastic molding industry.

Fort Worth, TX

Based in Fort Worth, TX, Maloney Technical Products provides custom rubber manufacturing, including compression, transfer, and injection molding services. They produce parts ranging from prototypes to high-volume production, from a few grams to over 500 pounds, primarily for the oil and gas industry.

Trevose, PA

Based in Trevose, PA, Mason Rubber Company, Inc. specializes in custom molded precision rubber parts. With over 30 years of experience, the company combines state-of-the-art technology and expertise to manufacture a wide range of custom rubber molding solutions for various industries.

Princeton, IN

Based in Princeton, IN, Mid-States Rubber Products, Inc. offers custom rubber and plastic solutions since 1944. Capabilities include precision rubber injection, compression, and thermoplastic molding, along with extrusion, custom mixing, and finishing. They also provide compound research, development, and engineering assistance for diverse industrial applications, serving Fortune 500 companies.

Lancaster, NY

Based in Lancaster, NY, Moldtech manufactures custom rubber molded products. The company offers thermoset rubber injection molding, sponge/foam molding, and LSR/HCR silicone molding. They provide services for products such as boots, bellows, diaphragms, dampers, isolators, hose, tubes, seals, gaskets, rollers, and wheels.

Based in San Bruno, CA, Morgan Polymer Seals specializes in high-volume precision rubber molding. The company provides advanced transfer molding services, manufacturing custom rubber components for various industrial applications.

Fort Worth, TX

Based in Fort Worth, TX, Mosites Rubber Co., Inc. fabricates diverse rubber products for industrial applications. They specialize in silicone and fluoroelastomer roll goods, including thick section molded pads. Offerings encompass premium silicone compounds, Viton®/FKM sheets, and hydroform rubber wear pads for sealing and impact reduction needs.

Deckerville, MI

Based in Deckerville, MI, Midwest Rubber Company specializes in rubber and plastics engineering and manufacturing since 1946. They provide dip, slush, roto-cast, foam, and thermoset rubber molding processes. Serving medical, heavy truck, automotive, and consumer goods industries, they engineer solutions for sealing, vibration, and durability challenges.

Canonsburg, PA

Based in Canonsburg, PA, National Rubber Corporation specializes in custom rubber components, sealing solutions, and engineered elastomer products. They provide custom molding, mixing, die cutting, and secondary fabrication services. The company also offers expertise in extruded rubber products, handling both standard and custom shapes.

Bakersfield, CA

Based in Bakersfield, CA, Newby Rubber Inc. is an 80,000 square foot custom rubber molding facility. Established in 1958, they specialize in custom molded rubber parts using materials like Silicone, Nitrile, and Neoprene. They serve industries including agriculture, food processing, and oilfield sectors.

Hayward, CA

Based in Hayward, CA, Pacific States Felt & Mfg. Co, Inc. specializes in creating standard and custom molded rubber components from various compounds. They apply commercial and military specifications to designs, producing items like O-rings, bumpers, and gaskets. The company also provides rubber extrusion, die cutting, and laminating services.

Yorba Linda, CA

Based in Yorba Linda, CA, Pacifictech Mold specializes in precision-engineered custom rubber and plastic molding solutions. They deliver durable, high-performance components tailored for unique requirements across various industries. The company also provides CNC machining, die casting, and sheet metal fabrication support.

Athens, TX

Based in Athens, TX, Peak Rubber Company engineers custom molded rubber and silicone products. They provide rubber manufacturing solutions, focusing on flexibility, quality, and speed for a wide range of industries. The company is ITAR registered and proudly Made in the USA.

Trenton, NJ

Based in Trenton, NJ, Pierce-Roberts Rubber Company specializes in manufacturing custom rubber products and components. They offer custom rubber compound formulation, rubber-to-metal bonding, and utilize compression, transfer, and injection molding technology for both prototype and high-volume production runs.

Minneapolis, MN

Based in Minneapolis, Precision Associates, Inc. manufactures custom rubber seals and other molded rubber products. Their offerings include O-rings, X-rings, U-cups, tri-clamp gaskets, rod wipers, and rubber balls. The company provides these custom rubber solutions for a variety of markets.

Santa Fe Springs, CA

Based in Santa Fe Springs, CA, RD Rubber Technology Corporation manufactures custom precision molded rubber parts. They offer comprehensive capabilities including compression, transfer, injection, and cleanroom molding, plus rubber-to-metal and silicone-to-plastic bonding. Providing engineering, product development, and prototyping, they serve critical applications in industries like aerospace, defense, and medical devices.

Carson City, NV

Based in Carson City, NV, REDCO manufactures and supplies commercial rubber products. The company specializes in custom rubber molding, rubber to metal bonding, die cutting, and rubber rollers. They deliver quality custom rubber parts for various industries and have been serving clients since 1948.

Houston, TX

Based in Houston, TX, RMC Plastics manufactures precision plastic and rubber molded parts for Texas and nationwide clients. With over 50 years in operation, they provide custom injection molding services, assisting with material selection, tooling, and process settings. They serve diverse industries including oil & gas, medical, and consumer products.

Minneapolis, MN

Based in Minneapolis, MN, Robinson Rubber Products Company, Inc. is an ISO 9001:2015 certified custom molding manufacturer. They specialize in elastomeric and thermoplastic components, offering custom rubber molding, liquid silicone rubber, and insert & over molding. Services include design assistance, material formulation, assembly, and packaging.

Rochester, NH

Based in Rochester, NH, The Rubber Group specializes in precision rubber molding, engineering custom compounds and tight-tolerance components for mission-critical applications. They serve industries like Aerospace & Defense, Electrical Transmission & Distribution, and Fluid and Process Control, providing high-performance rubber solutions.

Fort Worth, TX

Based in Fort Worth, TX, Rubber Xperts Inc manufactures and designs custom rubber products. They provide high-quality solutions for engineering challenges, specializing in O-rings, seals, pipes, extrusions, gaskets, and mounts. The company offers low-cost, pressure-resistant components suitable for widespread applications.

Henrietta, NY

Based in Henrietta, NY, Sealing Devices is an ISO 9001 registered manufacturer of custom-molded rubber parts and shapes. They utilize in-house tooling capabilities, offering products in various compounds and elastomers. The company provides compression, transfer, and injection molding processes for components such as seals, gaskets, and custom parts.

Elk Grove Village, IL

Based in Elk Grove Village, IL, Shida Rubber produces custom rubber parts through processes like mixing, extruding, and molding. Certified IATF 16949:2016, the company specializes in EPDM sealing solutions, providing tooling, laboratory, and secondary operations for diverse markets.

Miramar, FL

Based in Miramar, FL, SIMTEC Silicone Parts specializes in custom liquid silicone rubber (LSR) and LSR multi-shot molded components. They provide turnkey solutions from concept through high-volume production using advanced injection molding technologies. The company serves medical, mobility, consumer, and industrial industries.

Birmingham, AL

Based in Birmingham, AL, Spec Rubber provides custom rubber molding services for demanding industries. They offer heavy-duty compression molding for large parts, transfer molding for tight tolerances, and advanced injection molding for high-volume output. Capabilities include precision waterjet cutting and rubber product marking.

Staples, MN

Based in Staples, MN, Stern Rubber Company is an ISO 9001:2015 certified custom manufacturer of rubber molded goods. They offer injection, compression, and transfer molding, plus rubber to substrate bonding. The company supports low to high demand volumes, serving diverse industries like waterworks, powersports, and industrial applications.

Linden, CA

Based in Linden, CA, Stockton Rubber Manufacturing Co. Inc. manufactures custom and proprietary rubber products. They specialize in compression and transfer molding, offering handbuilt, mandrel built, and prototype solutions. With over 30 years of experience, the company serves various industrial sectors from its facilities in California and Arizona.

Trenton, TX

Based in Trenton, TX, Trenton Plastics specializes in plastic and rubber molding, offering injection, transfer, and compression processes. They work with a wide range of industry standard and engineered resins. The company supplies custom plastic and rubber parts to aerospace, oil & gas, medical, and electronics industries.

Cheektowaga, NY

Based in Cheektowaga, NY, USA Industrials specializes in advanced molding capabilities for custom designed products. The company molds components across a wide spectrum of plastic, rubber, and sponge/foam materials to meet diverse industrial needs.

Danbury, CT

Based in Danbury, CT, Vanguard Products Corporation specializes in manufacturing custom molded rubber parts and products. Their rubber molding experts utilize a variety of quality materials to produce precision components. The company offers tailored solutions to meet specific customer requirements for diverse applications.

La Habra, CA

Based in La Habra, CA, Vip Rubber and Plastic manufactures custom rubber and plastic products. Capabilities include molded rubber products, rubber extrusions, plastic extrusions, plastic pipe and tubing, and rubber sheet products. The company has been manufacturing high-quality parts in the USA since 1961.

Conroe, TX

Based in Conroe, TX, Western Rubber & Mfg. manufactures conventional-style drilling swivels, downhole sealing equipment, and various rubber components for the oil and gas industry. Capabilities include compression molding for products like rubber pipe wipers. They also provide well packers and mud pump parts.

San Antonio, TX

Based in San Antonio, Texas Dip Molding & Coating specializes in custom dip molding solutions. The company produces components using materials like medical-grade silicone, latex, and thermoplastic elastomers. They offer comprehensive services including design, prototyping, material sourcing, fabrication, finishing, and assembly for diverse industries.

Worcester, MA

Based in Worcester, MA, Jefferson Rubber Works, Inc. has manufactured custom molded rubber parts since 1975. They specialize in high-quality, precision-engineered rubber molding for OEMs across diverse industries, utilizing advanced mold-making techniques and offering a wide range of materials.

Three Rivers, MI

Based in Three Rivers, MI, Southern Michigan Rubber, Inc. specializes in precision rubber molding, offering short-run and high-volume production. They utilize compression and transfer molding to produce durable, high-quality rubber components for industries like automotive, aerospace & defense, medical, industrial, and electronics, customizing parts to meet demanding specifications.

San Jose, CA

Based in San Jose, CA, Ace Seal is a global supplier specializing in a variety of custom molded rubber components. Their offerings include O-Rings, gaskets, and seals, catering to numerous industries that require specialized rubber solutions for diverse applications.

Grand Prairie, TX

Based in Grand Prairie, TX, Advanced Rubber Molding Inc. was founded in 1979 to meet custom rubber molded needs. The company demonstrates a commitment to quality, service, and expertise, utilizing industry science and technology to produce high-quality products for a diverse customer base.

Lima, OH

Based in Lima, Ohio, BRP Manufacturing, Inc. produces sheet and extruded rubber products. The company utilizes a wide range of synthetic polymers for products from 1/64″ up to 3″ thick, serving military, automotive, transportation, aerospace, and general industrial customers. BRP also offers flame and smoke retardant rubber.

Irvine, CA

Based in Irvine, CA, California Sealing Solutions designs, develops, and manufactures custom rubber parts, components, and extruded profiles. They specialize in complex molded rubber products, including rubber bonded to metal, utilizing injection and compression molding processes. Services cater to equipment manufacturers and industrial companies nationwide.

Franklin, WI

Custom Fabricating & Supplies (CFS), based in Franklin, WI, specializes in custom rubber molding services. They offer injection and compression molding for prototypes and production parts, including seals and gaskets. CFS serves industries like automotive, medical, and aerospace with precisely engineered components.

Houston, TX

Based in Houston, TX, Eutsler Technical Products, Inc. manufactures custom precision rubber products for industrial OEMs. Specializing in compounding and fabricating materials like fluorocarbon and nitriles, they create gaskets, o-rings, seals, and bladders. The company provides on-site elastomer compounding and rubber-to-metal bonding.

Erie, PA

Based in Erie, PA, Lake Erie Rubber manufactures custom rubber parts. Specializing in injection, transfer, and compression molding, the company serves industries like rail, construction, oil and gas, and pet toys. They offer engineering, design support, and chemistry consulting to meet product specifications.

Burlington, WI

Based in Burlington, WI, Lavelle Industries is a USMCA-compliant OEM manufacturer specializing in custom rubber and plastic molding for over a century. They produce high-performance components for various sectors, including industrial equipment, hardware, electronics, healthcare, and plumbing, with U.S.-based engineering and manufacturing.

Bloomfield, NJ

Based in Bloomfield, NJ, Minor Rubber Company provides custom rubber molding services, including compression, transfer, injection, and latex dip molding. With over 100 years of experience, they manufacture high-quality molded rubber parts like bellows and boots for diverse industrial applications.

Minneapolis, MN

Based in Minneapolis, MN, Minnesota Rubber & Plastics specializes in developing and manufacturing custom molded rubber and custom molded thermoplastic products. The company also integrates these components into complex assemblies, leveraging expertise in rubber molding and plastics manufacturing.

Joshua, TX

Based in Joshua, TX, Petro Rubber Products, Inc. specializes in custom rubber molding. They employ injection, compression, and transfer molding techniques using compounds like Nitrile, Neoprene, and Viton. The company manufactures oilfield products such as swab cups, seals, packer kits, and O-rings.

Waxahachie, TX

Based in Waxahachie, TX, Precision Replacement Parts manufactures extruded and molded EPDM rubber, PVC, and HDPE based plastics. The company also produces various stamped and extruded metal products, primarily serving the classic and late model automotive industries since 1986.

Wadsworth, OH

Based in Wadsworth, Ohio, Qualiform, LLC provides custom rubber molding services, including injection, compression, and transfer molding. They also offer rubber extrusions, rubber-to-metal bonding, custom grommets, and gaskets. The company works with diverse materials like EPDM, Neoprene, Nitrile, and Viton for various industrial applications.

Des Plaines, IL

Based in Des Plaines, IL, Rahco Rubber offers custom rubber molding services, utilizing compression, transfer, and injection processes. They provide custom compounding, insert and over molding, and bonding rubber to plastics and metals. Rahco handles projects from rapid prototyping to high-volume production, focusing on precision and waste reduction.

Shakopee, MN

Based in Shakopee, MN, Rubber Industries, Inc. offers custom molded rubber, silicone, and LSR parts. Services include transfer, compression, and injection molding, tooling, overmolding, and rubber-to-metal bonding. They are ISO 9001:2015 certified, ITAR registered, and proudly manufacture in the USA.

Plano, TX

Based in Plano, TX, Service Rubber Group specializes in custom rubber injection molding for detailed rubber components. Their team of designers and engineers supports clients from concept to production, focusing on precision and efficiency. They provide efficient, cost-effective custom rubber molding solutions for various manufacturing processes.

Sealy, TX

Based in Sealy, TX, Stigall Industrial Products, LLC is a custom rubber manufacturer. The company specializes in custom rubber molding, producing components tailored to client specifications. They also provide on-site fabrication services, serving various industrial applications with their expertise in custom rubber solutions.

Livonia, MI

Based in Livonia, MI, Millennium Molding specializes in the production of durable recycled rubber and composite products. The company provides turnkey engineering, rapid prototyping, and sustainable manufacturing services. They offer comprehensive solutions for clients seeking custom rubber and composite parts.

Webster, TX

Based in Webster, TX, Mustang Seal Solutions specializes in providing custom rubber molding solutions. The company collaborates with clients to create cost-effective and high-performance products tailored to specific application requirements.

Ontario, CA

Based in Ontario, CA, Precision MFG. & Rubber specializes in elastomer molding. The company is dedicated to producing high-quality molded rubber products, focusing on excellence and superior craftsmanship in its manufacturing processes. They provide specialized molding services for various industries requiring precision elastomer components.

Poly-Tek offers custom rubber molding services, specializing in producing parts for high-volume applications and several moderate-volume projects. They handle identical materials across various production scales, providing tailored solutions for industrial and manufacturing needs.

R&R Rubber Molding Inc. manufactures custom rubber, precision-molded elastomer, and composite components. With nearly 50 years of experience, the company provides manufacturing services for a range of engineered parts. All components are proudly made in the USA.

Fullerton, CA

Based in Fullerton, CA, S&H Rubber is a contract manufacturer specializing in custom rubber parts. The company provides molding, extrusion, and stamping services for various applications. They have been serving clients since 1967, offering made-to-order rubber components.

Anaheim, CA

Based in Anaheim, CA, WARCO is a custom rubber manufacturer providing molded parts. The company offers compression, transfer, and injection molding capabilities, along with rubber extrusion and compounding services. They specialize in custom formulations for demanding applications, delivering solutions for both long and short production runs.

Found what you're looking for? Unlock 60 emails and 74 phones.

How to Choose a Company

  • Evaluate their material expertise beyond basic EPDM or NBR: Inquire about their experience with specialized elastomers like fluorosilicone, HNBR, or even custom blends for specific chemical resistance, temperature ranges, or low-compression set requirements.
  • Scrutinize their tooling strategy and ownership policies: Clarify who owns the mold tooling, the expected lifespan, maintenance schedule, and replacement clauses. A common gotcha is not having clear documentation or ownership of costly, application-specific tooling.
  • Assess their quality control protocols for critical features: Specifically ask how they measure and control durometer, critical dimensions, flash levels, and ensure consistent cure cycles. For medical applications, demand evidence of USP Class VI or ISO 13485 (if they do sub-assembly) adherence.
  • Confirm their proficiency in your specific molding process: If you need high-precision seals, verify their expertise in injection molding or Liquid Silicone Rubber (LSR) processing. For simpler, larger parts, ensure they have adequate compression or transfer molding capacity.
  • Request examples of their capability with complex geometries or bonding: If your part involves thin walls, intricate internal features, or overmolding rubber onto metal inserts, ask for case studies or sample parts demonstrating their success in similar challenges.
  • Understand their deflashing and secondary operation capabilities: Inquire about their methods for removing flash (e.g., cryogenic deflashing, hand trimming) and any post-cure requirements, as these significantly impact part cost, quality, and lead time.
  • For regulated industries, verify relevant certifications: For automotive components, IATF 16949 certification is often non-negotiable. For aerospace, AS9100 is crucial, and for food-contact or medical parts, strict FDA compliance or USP Class VI biocompatibility testing is paramount.

Frequently Asked Questions

How do I accurately specify the durometer for my custom rubber part?

Specifying durometer involves more than just a number; it requires understanding the Shore hardness scale (e.g., Shore A, Shore D) and the application's performance. You should define the target durometer range (e.g., 60 +/- 5 Shore A) and communicate the function (sealing, dampening, tactile) to your molder. They can then recommend the appropriate elastomer formulation and molding process to achieve consistent results within your tolerance.

What's the typical lead time and cost implication for new rubber mold tooling?

New rubber mold tooling, especially for injection or transfer molding, can range from 6 to 16 weeks or more depending on complexity, cavitation, and material (e.g., hardened steel vs. aluminum). Costs can vary widely, from a few thousand dollars for simple compression molds to tens of thousands, or even hundreds of thousands, for multi-cavity, hot-runner injection molds. Clarifying tooling ownership and expected lifespan upfront is crucial to manage expectations and total cost of ownership.

How can I minimize flash on my rubber molded parts?

Minimizing flash, the excess material squeezed out during molding, starts with superior tooling design and maintenance. Key factors include precise mold alignment, tight shut-off areas, appropriate gate design, and proper clamping pressure. Working with a molder skilled in DFM (Design for Manufacturability) during the design phase can significantly reduce flash, as can specifying suitable material viscosity and cure profiles. For critical applications, secondary processes like cryogenic deflashing may be necessary.

When should I choose Liquid Silicone Rubber (LSR) molding versus traditional gum rubber (HCR) molding?

LSR molding is ideal for high-precision, intricate parts with tight tolerances, especially in medical, infant care, and electronics industries due to its purity, biocompatibility, and temperature resistance. HCR (High Consistency Rubber) molding, often done via compression or transfer methods, is more suitable for larger, less complex parts, or when specific physical properties (e.g., high tear strength, specific chemical resistance) not easily achieved with LSR are required. The choice depends on part geometry, volume, required properties, and overall cost targets.

Can rubber parts be bonded to metal or plastic inserts during molding (overmolding)?

Yes, overmolding is a specialized capability where rubber is molded directly onto a rigid substrate, such as metal or plastic. This process creates a single, integrated component, often enhancing sealing, grip, or vibration dampening. Success depends on proper substrate preparation (cleaning, priming), compatible material selection, and precise control of molding parameters like temperature and pressure to ensure strong adhesion without damaging the insert. It requires molders with specific expertise and equipment.

What questions should I ask about material traceability and compliance for my rubber components?

For critical applications, inquire about their material supplier qualification process, incoming material inspection protocols, and lot-specific traceability from raw material to finished part. Ask for Certificates of Conformance (CoCs) and material data sheets. For highly regulated industries, verify their ability to provide documentation for compliance standards like REACH, RoHS, FDA, or USP Class VI, demonstrating that the materials used meet the necessary health, safety, and environmental requirements.

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