art b and mix the silicone rubber and curing agent evenly. Step two: vacuum pumping Without exception, this step takes less than 10 minutes. Note: the time for vacuum-pumping should be less than 3¡a5 minutes , otherwise, once the silicone rubber has cross-link reaction during vacuum pumping process, it will not be operated. Step three: pouring the vacuumed silicone mixture into the frame with original concrete mold . Shelf life for silicon rubber concrete molds 10~12months, when stored in a dry & cool place under the room temperature 25. Packing for silicon rubber for concrete molds 25kg/drum 200kg/drum
