Although Liquid Silicone Rubber do not shrink in the mold, they often shrink by 2.5%-3% after demolding and cooling. How much shrinkage depends to some extent on the formulation of the compound. However, from a mold perspective, shrinkage can be affected by several factors, including the temperature of the mold, the temperature at which the compound is released from the mold, and the pressure in the mold cavity and subsequent compression of the compound.

The location of the injection point is also worth considering, because the shrinkage in the flow direction of the compound is usually larger than the shrinkage in the direction perpendicular to the compound flow. The external dimensions of the product also affect its shrinkage rate, and the shrinkage rate of thicker products is generally smaller than that of thinner ones. Additional shrinkage may be possible if secondary vulcanization is required.