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Glass molds are made from ceramic so they can go right in the kiln with your glass pieces. They can be used again and again. The same molds can also be used for clay.
Important:You need to use Glass Separator on your molds so the glass does not stick to them. Kiln wash is a possible alternative, if that is all you have on hand. However kiln wash is less finely ground, so it tends to stick to the glass and can be hard to scrape off.