Smooth-Sil 940 Food Grade Mold Making Silicone Rubber - Trial Unit Suitable for Food Grade applications (See Technical Bulletin) - Great for making baking molds and trays, ice trays, casting butter, chocolate, fondant and other applications used to produce foods. Shore 40A Hardness Mix Ratio: 100A:10B by weight (requires digital gram scale) Pot Life: 30 minutes - Cure Time: 24 hours Also can be used for general mold making. Materials such as plasters, concrete, wax, low-melt metal alloys or resins (urethane, epoxy or polyester) can be poured into it.