12″ x 1/4″ Dia. Red General Silicone Layer Discs - Set of 4

Silicone rubbers are generally used when casting zinc-aluminum alloys because of their higher heat resistance. Some mold makers also use them when casting tin and lead alloys because it is easier to form the mold around their designs. The silicone merely pushes into place. However, silicone rubbers are not recommended for long runs of thick, complicated, undercut models because their tear resistance is somewhat less than our black rubber molds. Silicone sets of discs consist of four 1/4” discs, two with holes and two without.

The most popular silicone rubber, Red Silicast, is good for thin-walled zinc/aluminum alloys, as well as for general purpose casting molds.

Vulcanizes at 315°F.