How do you know when you can use a glazed bowl for glass slumping? I am also a potter and have used bisque bowls, but I think a glazed surface would leave a smoother finish. I know my bowls are fired to over 2,000 degrees, much hotter than needed for glass.
Glass once it begins to flow fully at 1450 & above will just about stick to anything so a ‘release agent’ of some sort is required. Kiln wash, firing paper, boron spray etc. So its not so much the temperature the mold can withstand its the sticky glass! Even stainless steel molds need release agent & its melting point is 2750.
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