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Casting & Annealing Fundamentals

A brief explanation of the principles for Casting and Annealing Glass, as well as a description of important terms. 1. Annealing Glass: controlled cooling from working temperature to room in a manner that removes strain and stress from the glass body. 2. Annealing Point: the temperature ABOVE which glass begins to move. 3. Anneal Soak: holding the glass at a point between the Annealing Pt and Strain Pt. for long enough to equalize the temperature throughout the material. 4. Strain Point: the temperature BELOW which we cannot permanently add or remove stress. 5. Annealing Range: the temperature range (between the Annealing Pt and Strain Pt) where stress can be removed from glass. 6. Quartz Inversion: the sudden change in size/shape of silica particles at roughly 1160ºF. 7. Devitrification Range: the temperature range where glass begins to turn back into it's crystalline form. This often appears as a wrinkled or frosty surface and can be so bad the glass begins to self-destruct. 8. Process Temperature: the working temperature of the glass—whether blowing, casting, slumping, fusing, etc. 9. Anti-Shrink Zone: the temperature range where slow cooling can prevent "suckers" in the surface of the casting.