Although LSRs do not shrink within the mold, they often shrink by 2.5% -3% after demolding and cooling. As for the exact amount of shrinkage, it depends to some extent on the formula of the adhesive. However, from the perspective of the mold, the shrinkage rate may be influenced by several factors, including the temperature of the mold, the temperature at which the material is demolded, as well as the pressure inside the mold cavity and the subsequent compression of the material.

The location of the injection point is also worth considering, as the shrinkage rate in the direction of the rubber material flow is usually larger than that in the direction perpendicular to the rubber material flow. The external dimensions of a product also have an impact on its shrinkage rate, and thicker products generally have a smaller shrinkage rate than thinner ones. If secondary vulcanization is required, additional shrinkage may occur.

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