E flowing liquid with general hardness of 22-50aafter curing with features ------ s than 10 minutes. Note: the time for vacuum-pumping should be less than 3a5 minutes , otherwise, once the silicone rubber has cross-link reaction during vacuum pumping process, it will not be operated. Step three: brushing cast & perfusion molding operation Shelf life for silicon rubber for mold making 10~12months, when stored in a dry & cool place under the room temperature 25. Faq silicone rubber for mold making: Why is the silicone mold oily? The molding silicone rubber itself doesn't contain any oil, so it won't be oily. If the mold is oily, it may because you add compound silicone oil which is the compound of silicone oil and white oil. But the white oil is not silicone oil but a kind of petrochemicals. Packing for silicon rubber for mold making 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