Poly 74-44 is a 2A:1B mix, A~45-48 hardness, polyurethane liquid rubber that cures in 16-24 hours and is designed for making high-performance rubber molds for casting materials such as plaster (millwork, home décor, etc.), wax (candles & lost wax varieties), concrete, GFRC, GRG and resins (polyurethane, polyester, epoxy - with proper release agents). Poly 74-44 liquid rubber is an excellent multi-purpose, economical mold material that will provide long mold life, durability and consistent performance under repeated casting. Poly 74-45 is known for its outstanding tear strength and high elongation.
Technical Bulletin 74 Series Part A MSDS 74-44 Part B MSDS