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Molded Rubber

A reliable source for Molded Rubber information and leading Molded Rubber Companies & Suppliers.

Molded rubber is the result of the rubber molding process. Rubber molding is the process of transferring, compressing, or injecting raw rubber material into a metal mold cavity to turn uncured rubber or an elastomer into a useful product. Molded rubber items are produced using three basic techniques: injection molding, transfer molding, and compression molding. Read More…

Molded Rubber Molded rubber is the end product of the rubber molding process. Rubber molding is the process by which raw rubber is melted and formed in a mold. There are three main processes used for to produce molded rubber products, these are injection molding, transfer molding and compression molding.
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Leading Manufacturers

Santa Fe Springs, CA  |  562-941-4800

RD Rubber Technology Corp is an ISO 9001:2015 / AS9100:2016 certified and ITAR registered company. We offer compression, transfer, injection and Liquid Injection molding, rubber to metal bonding, engineering support, tooling design, machining and more. Our customers rely on us to give them the best possible production solutions for rubber molding. From aerospace to medical, food processing to military applications we build trust by being responsive to your needs.

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RD Rubber Technology Corporation $$$

Stuart, FL  |  772-286-9278

If you have a need custom rubber molding for products with a fast turnaround, Britech Industries is the company you need to call. We do molded, extruded and die cut rubber – of various products and in the colors and compounds you need.

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Britech Industries $$$

Trenton, NJ  |  609-394-5245

With more than a century of manufacturing experience, Pierce-Roberts Rubber Co. is your source for custom molded rubber products.

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Pierce-Roberts Rubber Co. $$$

Chicago, IL  |  800-782-7776

Rubber molding is what we do best. We believe in offering our very best to all customers no matter how large or small. For over 65 years we have pushed the boundaries of what we do and continue to improve our products and customer service every day.

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Accurate Products, Inc. $$$

Carson City, NV  |  800-733-2648

REDCO Rubber Engineering & Development is your complete source for rubber molding products, including rubber rollers, die-cut gaskets, and custom rubber products to suit your application.

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REDCO Rubber Engineering & Development Company $$$

Canonsburg, PA  |  866-672-8100

National Rubber was founded in 1997 with the values of variety, consistency, quality, open communication, and timely delivery at its core.

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National Rubber Corp. $$$

Trevose, PA  |  215-355-3440

Mason Rubber is a full-service organization assisting in the designing or reverse engineering of custom product to fulfill your production requirements.

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Mason Rubber Co., Inc. $$$

Minneapolis, MN  |  1-800-927-1422

Minnesota Rubber and Plastics (MRP) is a leader in material compound development and the manufacturing of custom elastomeric and thermoplastic components. With facilities across North America, Europe, and Asia, MRP collaborates with original equipment manufacturers to solve difficult sealing and component challenges across multiple markets. Capabilities include materials science and formulation, fully functional product prototyping, and operational excellence and supply chain consolidation.

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Minnesota Rubber & Plastics $$$

Akron, OH  |  877-771-6766

With over 30 years of experience in the rubber molding industry, we remain committed to offering the best of our time and energy to all customers no matter how large or small.

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Premier Seals Manufacturing $$$

Grand Rapids, MI  |  616-538-4970

Kent Rubber Supply leverages our experience, innovation and continuous development to ensure our customers get the best products. We specialize in small to large batch production runs of molded rubber parts, allowing us to offer ultimate customization when it comes to a wide variety of specs. Our products vary in shapes, sizes and wall thicknesses in materials such as PVC and urethane. Both domestic and offshore services are available.

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Kent Rubber Supply Co. $$$

Tinley Park, IL  |  800-662-1009

Aero Rubber is an ISO 9001:2015-registered, world-class manufacturer of molded rubber products, custom molded rubber and molded rubber goods.

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Aero Rubber Company, Inc. $$$

Rootstown, OH  |  330-325-1821

Jet Rubber Company, employee-owned, offers custom molded rubber and rubber to metal components. They offer rubber molding in a wide array of standard rubber products as well as custom options for those more complex and difficult jobs.

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Jet Rubber Company $$$

Southborough, MA  |  508-229-2000

Spring-Fast Grommets with fusion bonded nylon & a polymer cushion prevent wire chafe & give you best in class performance, 49% install savings & a 9.5x efficiency improvement. The nylon clad metal substrate snaps on with finger pressure & self locks - eliminating adhesives & the old slow & costly gluing process. It is used widely used in across the OEM & contract manufacture sectors. ISO 9001:2015 & AS 9100-D. Collaborative product customization available. Request free samples on site.

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Device Technologies, Inc. $$$
placeholder image RD Rubber Technology Corporation Britech Industries Pierce-Roberts Rubber Co. Accurate Products, Inc. REDCO Rubber Engineering & Development Company National Rubber Corp. Mason Rubber Co., Inc. Minnesota Rubber & Plastics Premier Seals Manufacturing Kent Rubber Supply Co. Aero Rubber Company, Inc. Jet Rubber Company Device Technologies, Inc.

custom rubber parts

Types of Rubber Molding Processes

The different types of rubber molding processes include:

Compression Molding

A rubber compound or mixture of raw materials is used in the compression molding process to produce "pre-forms" that roughly resemble the final product. Pre-forms offer an abundance of material that can be used to completely fill the void. Once the pre-form is in position, the mold is subsequently sealed, providing pressure and heat to the pre-form to help it fill the cavity. Excess pre-form material overflows into overflow grooves as the cavity is filled. After this, the rubber is often demolded by hand, leaving us with the final product made of molded rubber.

the first part of compression molding

In applications requiring extremely expensive materials or low volume production, compression molding is frequently utilized for medium hardness compounds. The quantity of overflow, or flash, produced during the rubber molding process is reduced thanks to this procedure. Pre-forms for compression molded rubber products can be challenging to insert into more intricate mold designs. Furthermore, the material flow requirements of tougher rubber compounds do not suit the compression molding process effectively.

the demolding process of compression molding

Rubber Injection Molding

By heating the rubber and applying much higher pressure per square inch of cavity surface during molding, rubber injection molding successfully modifies the plastics manufacturing process. In contrast, the materials are cooled under less pressure during the plastic injection molding process.

custom rubber parts

In many instances, injection molding has evolved into one of the most effective ways to make molded rubber products. The preparation of the material effectively is the first step in the injection and injection-transfer molding processes. The material is first mixed in bulk, and then it is promptly peeled into continuous strips that are approximately 1.25" wide and .375" thick. These strips are then fed through a screw, which fills a barrel with the right amount of rubber material according to a predetermined amount.

injection molding

Transfer Molding

Transfer molding involves secondary raw material preparation into pre-forms, just like compression molding. However, it varies in that these pre-forms are put into a "pot" that is situated between the top plate and a plunger. The mold is shut after the pre-forms have been put inside it, and the material is crushed by the plunger and transmitted through sprues into the cavity below.

Types of Rubber for Molding

The different types of rubber used in molding include:

  • Natural Rubber: The latex that the rubber tree produces is where natural rubber is derived. It is the perfect material for vibration dampers, seals, o-rings, mountings, diaphragms, and bumpers due to its high-tensile strength, abrasion resistance, and surface friction qualities. Natural rubber can be used as a covering since it adheres to metal well.
  • EPDM: Ethylene, propylene, and a diene comonomer that enables crosslinking are combined to create EPDM. Because of its structure, EPDM can withstand temperatures of up to 150 °C and is resistant to heat, light, and ozone. Given the right conditions, EPDM has a long shelf life. It is employed in braking systems, vehicle and truck panels, and steam systems.
  • Silicone: Silicone mixed with carbon, hydrogen, and oxygen results in silicone rubber, a substance that resembles rubber. The word, "silicone rubber," refers to a variety of silicone rubbers, which can be distinguished by their chemical composition and organic grouping. Methyl, methyl phenyl, methyl vinyl, methyl phenyl vinyl, and fluoro vinyl methyl are among its several forms. Due to its flexibility, tolerance to high temperature changes, and weather resistance, silicone rubber is frequently utilized.
  • Neoprene: Chloroprene is emulsion polymerized with a potassium catalyst to create neoprene rubber, commonly known as polychloroprene or chloroprene. It is a versatile material with qualities that make it resistant to abrasion, fire, heat, and the elements. Neoprene is used for coating, hoses, and gaskets because it resists degradation.
  • Urethane: After being combined with a catalyst, polyol and a diisocyanate or polymeric isocyanate are reacted to create urethane or polyurethane. Since there are numerous varieties of polyols and diisocyanates, there are numerous varieties of urethane rubber materials that can be produced from the various ways in which the compounds can be combined. Rubber made of urethane is utilized in situations where good tensile strength and abrasion resistance are required.

Molded Rubber Informational Video

 

Rubber Molding Power Pages

Compression Molding

Compression Molding

Molding is a manufacturing process that uses a mold - the latter being a solid container used to give shape to a piece of material. It is a forming process. The form is transferred from the mold to the material by...

Rubber Injection Molding

Rubber Injection Molding

Rubber injection molding is when uncured rubber is transformed into a usable product by injecting raw rubber material into a mold cavity made of metal. The applied pressure produces a chemical reaction like...

Rubber Molding

Rubber Molding

Rubber molding is a process of transforming uncured rubber or an elastomer into a usable product by transferring, compressing, or injecting raw rubber material into a metal mold cavity...

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