Polly Plastics Silicone Molding Putty - 1/2 Lb - for Moldable Plastic | Wax | Clay | Urethane and Epoxy Resins | Plaster Non-toxic and odor free. Heat tolerant up to 450 F. 4 minutes of working time De-mold in 30 minutes. Self-releasing  no mold release agent required for most applications. Long shelf life, no shrinkage. Not intended for food contact applications. Made in USA.