Rubber Molders and Moldings

The process of rubber molding involves shaping raw rubber materials into functional products. While some products can be made by other rubber shaping processes such as cell casting and extrusion, the molding process has its own features that set it apart. Products that are made through rubber molding are enclosed in a mold cavity instead of a die, and can thus be made into complex and irregular shapes.

Rubber molding is a operation in which raw melted rubber takes form inside a mold. Many kinds of complex rubber products, such as rubber diaphragms and rubber seals, are made this way, due to the ability of the rubber molding process to precisely design a product so it fits perfectly into a piece of equipment without the risk of any kind of leakage. Products that are made to protect equipment, such as rubber washers and rubber grommets, must also be designed with precision, and are thus manufactured by rubber molding. These products can also be produced through rubber extrusion. However, extruding machines have much more limited capabilities. An extruder only has control over the X and Y axes, and are thus much more suited for the production of simpler rubber products such as rubber baseboards or rubber sheets. Rubber molding allows from design control over three axes due to the process involving a molding cavity instead of a die.

To one extent or another, molded rubber products span every industry. Since many manufacturing machines contain moving parts that can vibrate excessively, rubber washers and rubber bushings are installed to secure these moving parts and absorb vibration in an effort to protect the people operating them. Another component that can be used to absorb vibration is a rubber sheet. A rubber sheet is a large, thick sheet that reduces vibration and noise in a machine when placed underneath it. The reduction of vibration and noise can greatly improve overall safety and working conditions. Rubber grommets are another useful component that is used extensively for industrial, consumer, and commercial purposes. Rubber grommets are made to fit around a hole in a surface, protecting wires or other hardware that must pass through it. Grommets can also protect the hole itself from wear or damage. Rubber grommets can be found protecting wires from becoming disconnected, or aligning the holes in desks which allow safe passage for computer wires.

Some Leading Manufacturers

RD Rubber Technology Corporation

Santa Fe Springs, CA | 592-941-4800

RD Rubber Technology Corp is an ISO 9001:2008 certified company. We offer injection, LIM and transfer molding, rubber to metal bonding, engineering support, tooling design and more. Our customers rely on us to give them the best possible production solutions for rubber molding. From aerospace to medical, consumer products to military applications we build trust by being responsive to your needs.

Pierce-Roberts Rubber Co.

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. We offer a variety of custom rubber molding services, including rubber mixing and formulating, rapid prototyping, molded rubber product design and research, and more. At Pierce-Roberts, customers get a product that matches specifications and service that exceeds expectations. That is our guarantee.

Britech Industries

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. We can manufacture domestically or off shore. If you do not see what you need for your application, let us know, so we can find a solution for you!

Mid-States Rubber Products, Inc.

Princeton, IN | 812-385-3473

Mid-States Rubber Products has been manufacturing and designing all kinds of rubber products since 1944. With more than 70 years of experience, we offer you the very best rubber molding services and molded rubber products. Custom rubber molding is our specialty, and our experts can provide you with design assistance to ensure you receive the perfect product for your requirements. We can also mold a huge range of rubber materials, so we know we have a solution for any of your rubber molding needs!

Premier Seals Manufacturing

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. We believe in providing our customers with the tools they need to succeed. Learn more about what we can do for you on our website today!

Soucy Baron, Inc.

Saint-Jérôme, QC | 450-436-2433

Soucy Baron is an experienced, innovative rubber molding and polymer engineering company. We manufacture all kinds of molded rubber products, providing you access to a full team of engineering experts that will design your molded rubber component to your exact specifications. We also offer polymer engineering, overmolding, bonding, and noise, vibration, and harshness control products, so we know we can find a solution for you!

Jet Rubber Company

Rootstown, OH | 330-325-1821

Jet Rubber Company is a leading manufacturer of custom molded rubber components. We can mold all kinds of rubber, including natural rubber, silicone, EPDM, Nitrile, Viton, and much more. We can even mold rubber-to-metal components. Our experienced staff will work with you to fully understand your specifications and applications, and we will create the perfect product for you! Get in touch with us for your expertly molded rubber products!


The various types of rubber that can be molded include natural rubber, as well as synthetic rubber such as neoprene, foam rubber, EPDM, silicone rubber, and liquid silicone rubber. Natural rubber is the most widely known and has been used the longest. The first suspected use of rubber dates back to Mayan civilizations around 1600 BCE, but it has been used industrially since the 19th century. During the 20th century, natural rubber was scarce, thus leading to the development and flourishing of synthetic rubber. Today, less than half of all rubber materials manufactured worldwide are made from natural rubber. The first synthetic rubber to be produced on an industrial scale is neoprene. While neoprene and other synthetic rubbers have the same positive qualities as natural rubber, they are not without their drawbacks. Synthetic rubbers such as EPDM, neoprene, and silicone can be made corrosion-resistant, heat-resistant, ozone resistant, inert with certain chemicals, and made with varying degrees of properties such as rigidity, flexibility, durability, and strength. Because of the existence and capabilities such as synthetic rubber, industries such as health care can make use of numerous applications while reducing the health risk. For instance, alternative materials are available for people with latex allergies, and intravenous fluids can pass safely through silicone tubing without causing allergic reactions.

The types of rubber molding include injection molding, liquid injection molding, compression molding, and transfer molding. All four methods have their similarities; however, injection molding is used more widely than any other method. The first step in the injection molding process involves collecting raw rubber material, known as stock. The stock is then placed into a hopper that is suspended over a conveyance channel. The stock is then released, and processed through a channel that features a large turning screw. By the time the stock reaches the end of the channel, it is completely melted as a result of a combination of the heating elements within the channel, and the friction caused by the screw’s motion. At the end of the channel is a mold cavity into which the molten rubber is injected. The elements of heat and pressure work together to ensure that the molten rubber fills the cavity entirely, down to the very contours of the mold, and is uniformly distributed. The molten rubber is allowed to cool and harden within the mold, and can be safely removed from the mold cavity once it reaches a solid state. Once removed, the mold could have certain imperfections such as seams. If this is the case, the rubber product may have to undergo further processing if necessary. It is possible to add a variety of finishes and textures to the final product to add an aesthetic touch. For industries such as medical, aerospace, and electronics that require an injection molded product to be of a certain design, custom molding is also available. Although custom rubber injection molding is more costly, the cost is much lower in comparison than other methods of rubber manufacturing.

RD Rubber Technology Corporation

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