Rubber Compression, Transfer, and Injection Molding at Pierce-Roberts

Pierce-Roberts Rubber Company offers custom rubber compression, transfer, and injection molding services to produce high quality molded rubber parts and components. By utilizing these methods, our rubber products span several ranges in size, material, color, and construction. As a leading rubber product manufacturer, Pierce-Roberts Rubber Company provides customers from diverse markets with the custom molded rubber parts or components they want at the tight tolerances they need.

Rubber Compression Molding
Recognized as the simplest form of thermal set molding, compression molding produces rubber molds that vary in size and complexity. Uncured rubber is shaped to the correct size and specification and is then placed on one of the many mold cavities before closure. Pierce-Roberts custom rubber compression molding features lower tooling and set-up costs for manufacturers in search of short runs or prototypes. Other advantages include larger cavity density and reduced rubber product waste.

Rubber Transfer Molding
Unlike compression molding, transfer molding does not place uncured rubber directly in the mold. Instead, it is kept in a transfer pot, which is positioned above the cavity area. When ready, the mold is transferred into the cavity by a piston through a runner, sprue, and gate system. By utilizing heat and pressure, the rubber becomes vulcanized or cured. Many rubber product manufacturers consider custom rubber transfer molding more accurate than compression molding. Its accuracy reduces reject rates on small to medium runs of precision custom rubber parts or components. Additional advantages include shorter cure times and reduced mold making labor.

Rubber Injection Molding
Similar to custom rubber transfer molding, injection molding inserts rubber materials into the cavity after the mold is closed. Rubber materials are heated and forced into the mold through a screw or ram injector. Pierce-Roberts custom rubber injection molding produces a virtual flash-free finish, which eliminates the need for additional trim work and is utilized when high quality must match high volume.