Rubber Mold

A catalytic, RTV silicon rubber skin mold for the making of small wax skulls.

Or another medium if such were desired.  Polyester, acrylic, cements, reconstructed media, the choices are many and varied.

Withdrawing the pattern

Here the ‘master’ is being withdrawn from the rubber ‘skin. This rubber is a very strong, tear resistant, flexible substance and when designed well for such a mold as this will be capable of innumerable  reproductions before deterioration renders it unusable.

Extracted Skull

The master pattern released and the rubber ready for wax.

Mother Mold Opened

Opened up, the ‘skin’ now shown fitting inside is the rubber mold which wax is poured into at 90 c.

Depending on ambient temperature the wax may be cold in 4 hours or thereabouts and ready for removal.

Mother Mold

Looks like something ready to go in the bin?

This is the casing or ‘Mother Mold’ which supports the rubber inside. In this instance it is made with fiberglass for strength and durability. Often made with gypsum, ‘Plaster of Paris’, for convenience.

Short lived and fragile comparison to fiberglass.

    
Kiln Cast Lead Crystal Skulls