ECONOSIL-25 A/B Tin Base (Condensation Cure), two-component, room temperature cure (RTV) rubber designed as a low cost mold material with good physical properties primarily for making short-run production molds. Use molds to cast polyester, urethane, epoxy, low melt metal (350F), thermoplastics (Polyvinyl), wax, soap, plaster, and any material where a release free casting is required.