This is a soft, natural, pliable rubber. It has the ideal characteristics for difficult molds containing undercuts, filigree and settings. Rubber is 1/8" thick and vulcanizes at 310°F- 15 minutes for 1/4" mold frame thickness.
High Strength Silicon Rubber Castaldo® Super High StrengthTM Silicone Jewelry Molding Rubber makes a smooth and shiny mold- A shiny finish on your molds means a shiny finish on your waxes. That means less polishing of your castings.