Liquid silicone rubber for gypsum molds , it will not be operated. Step three: pouring the mixture into the frame with original gypsum mold slowly . Shelf life for liquid silicone rubber 10~12months, when stored in a dry & cool place under the room temperature 25. Packing for liquid silicone rubber 1kg/ bottle , 5 kg/drum vacuumed packing, 25kgs/drum vacuumed packing, 200 kg/drum 25kg/drum 200kg/drum