Low shrinkage and non-deformation Resistance to acid-alkali and expansion Liquid silicone rubber for gypsum operation instructions Step one: take 100g of part a and add 2g of part b then mix them evenly. Step two: vacuum pumping The time for vacuum-pumping should be 3a5 minutes , otherwise once the silicone rubber has cross-link reaction during vacuum pumping process, 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 it 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 - 1kg/ bottle , 5 kg/drum vacuumed packing, 25kgs/drum vacuumed packing, 200 kg/drum