Custom Silicone Rubber Molds for Epoxy Resin Embedding

A two-component silicone rubber kit makes possible the fabrication of custom embedding molds for use with epoxy resins. The kit contains a base material and a curing agent, which are combined by weight, degassed under vacuum (if necessary), and poured into the reservoir of a cast. The silicone rubber mixture cures within 24 hours at room temperature, producing a strong mold that is both flexible and tear-resistant. A three-piece aluminum cast, especially designed for mold-making, consists of a frame surrounding the template that rests on the wings of a platform and forms a reservoir to hold the silicone