Compression Molding

Specialty Manufacturing, Inc. (SMI) specializes in low and medium volume silicone rubber compression molding runs to create a variety of parts, including gaskets, seals, and intricate medical components. The increased production rate, shortened lead times and less expensive tooling make this compression molding process more economical for prototypes, short runs, flat sheets and start-up production.

Compression molding is one of the most common silicone molding techniques, and it is a time-tested and effective SMI molding process. Parts constructed using a compression molding process tend to be free of residual stress and highly detailed.

What is silicone compression molding?

Compression molding is the process of placing un-vulcanized LSR material into the cavity of each half of the mold. The mold is then assembled, placed into a heated compression molding press, and cycled. Silicone is vulcanized through this compression molding process and a part is formed. While this silicone molding process itself is somewhat slower than injection molding, it does yield quick turns on prototype or R&D phase parts as well as less costly tooling upfront. SMI uses silicone molding processes, like compression molding, to precision and quality.

Micromolding Medical Components
for Small Volume Parts

Taking advantage of compression molding processes and advanced silicone molding techniques, SMI specializes in producing micromolded medical components for small volume parts with complex details that require tight tolerances.


Silicone Compression Molding for LED Lighting

For low volume LED lighting applications, our optically clear silicone replaces glass as the ideal material due to increased transparency and flexibility. This silicone molding process enables engineers to develop innovative designs and small-run manufacturing methods which were previously out of reach.

Low Volume Silicone Manufacturing Process

One of the advantages of working with SMI for your compression molding needs is that we specialize in low and medium volume runs of your part. This unique capability offers a lower average cost due to fewer materials used and a less expensive tooling.


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Find out how SIM’s silicone molding techniques and compression molding processes, can create
high-quality silicone parts for medical, industrial, and research applications.

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