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Supplier Quality Assurance Manual

Silicone Injection

Liquid silicone rubber uses a high-purity, platinum-cured silicone with low compression set resistance, high stability and good extreme temperature resistance. Liquid silicone is ideally suited for production of parts where high quality is a must. Owing to the thermosetting nature of the material liquid, silicone injection molding requires special care: a customized mixing process as well as maintaining the material at sub-ambient temperatures before it is injected into the molding cavity formed by die halves that are held in place by high pressure.

Silicone rubber belongs to the thermoset elastomer family that has alternating silicone and oxygen atoms and methyl or vinyl side groups. Over a wide range of temperatures, Silicone rubbers can withstand a wide range of temperatures while maintaining their mechanical properties. Additionally, the methyl side group in silicone rubbers makes these materials extremely water repellent.

Typical applications for liquid silicone rubber are products that require high precision (seals, sealing membranes, electric connectors, multi-pin connectors) or smooth surfaces (infant products like bottle nipples, medical applications and kitchen goods such as baking pans or spatulas). Silicone rubber is often over-molded onto parts made of various plastics.