Clay Molds for Warm Glass
There are many fine books on those parts of the process, so I'll skip them here. So you end up with a rubber master, and an outside frame I made from wood:. Permanent Molds I've been interested in warm glass processes since my wife and I first visited Bullseye Glass's store and gallery in Portland in So you end up with a rubber master, and an outside frame I made from wood: Note the tight corners on the rubber master. Try to form the negative of THAT using clay.
Placing the rubber master inside of the mold box, I mix up my borosilicate castable, we'll call Borocast here, and fill the mold: The next day the castable has set and I can remove the outer mold box and the inner rubber mold. I fire the mold to C for 20 minutes.
After it's fired, it rings like a bell. Cover the bowl with cloth so that it will release from the clay, Press the clay it against the bowl so that the clay assumes the exact shape of the bowl. Let the mold try a little and lift it off the bowl.
It should be dry enough that it retains its shape when separated from the bowl. Use a needle tool to poke small holes in the bottom of the clay mold. Create four holes near the bottom. This is important as it will let the trapped air out of the bowl as the glass slumps into it during the firing.
Fusing Supplies | Glass Molds, Bottle Slumps, Casting Molds, More
Create a flat, steady foot on the mold so that it will stand straight in the kiln, even with glass loaded on top. Use a damp sponge to create a smooth surface on the inside.
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Use it to remove sharp edges and fingermarks as well. Focus on the inside of the mold, as this is where the glass will drop and from a bowl.
Let the clay dry and bisque-fire it in a kiln. This will burn out any impurities and harden the clay for handling.
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It would make sense to make several molds at once to fill the kiln. Historians have found traces of both methods dating back to the second millennium BC in Mesopotamia. Glass mosaics, valued in Greek and Romans civilizations, were considered equal to silver and gold as precious materials. By the third century AD warm glass fell out of favor, eclipsed by a new blown glass technique.
It was not until the emergence of the European Arts and Crafts movement, in the late nineteenth century, that warm glass was revalued as a decorative art form.
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Today, contemporary artisans have rediscovered these ancient techniques. Basic Instructions for Contemporary Glass: The composition of contemporary designs can be easily made by the random arrangement of chosen elements.
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The following project involves experimentation with 1. Tack fusing produces a relief-like surface accomplished by firing at a higher temperature. For full fusing and slumping methods, follow these steps. Slumping will require a second hour firing.