How To Shrink a Casting using NOVOCS Silicone Solvent

The plastic cup is removed from around the mold. The rubber mold is carefully peeled away from the model. Rubber is very weak at this point and has low tear strength.

The mold is allowed to shrink for up to 10 days. Mold is ready for casting and will yield castings that at least 20% in size vs. the original. In the gallery below is a comparison of original sized model measuring 3” (7.6 cm), a casting out of a mold reduced in size to yield a casting that is 2 3/8” (6 cm) and a casting out of a mold reduced to yield a casting that is 1.9” ( 4.8 cm).