Standard datasheet of manual moulding silicon rubber: Model:418 Appearance:white Viscosity (cs):12000~15000 Hardness (ao):25~30 Tear strength (kgf/cm): 5 Shrinkage (%): .3 Elongation (%):200 Mixing ratio(%): 2~3 Operating time(h):2~3. 25kg/drum, 200kg/drum.