Is chemically equivalent SILASTIC® LC-40-2004 PART A&B. 40 Durometer, 2 parts, 1 to 1 mix, translucent, FDA 21 CFR 177.2600 and BfR, XV, molding and injection molding grade Liquid Silicone Rubber. Fast curing speed, long pot life (72 hours), high transparency, high tear strength, low compression set.