Features of tyre molding silicone rubber : 620# tyre molding silicone rubber is used in pouring ( wrapping ) way to make molds, and is with the hardness of about 20 shore a. Thus it is with advantage of low viscosity, good fluidity, good operability , easy to release bubbles, excellent tensile and tear strength, easy for pouring, and what¡¡¥s more, it is in blue, thus it is very easy to distinct Besides, we could provide you the best suitable silicone according to the features of your products and the way of making molds. 25kg/drum and 200kg/drum