Method 1: General solid silicone rubber sheet: Weight (g) = length (cm) * width (cm) * thickness (cm) * specific gravity (1.3g/cm3) For example, the length of silicone rubber sheet is 100cm, the width is 10cm, and the thickness is 1cm. Weight=100*10*1*1.3=1300g=1.3kg Method 2: Weigh out the exact weight of the silicone plate with an electronic scale.