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Kiln-formed Glass and Heatwork

When an artist begins working with kiln-fired glass, their firing schedules typically focus on two main outcomes – firing glass to a full fuse to “melt” (or fuse) all glass pieces together and firing at a lower temperature to shape the glass. Full fuse temperatures generally range from 1450 to 1500 degrees Fahrenheit. Slumping temperatures are generally between 1100 and 1250 degrees Fahrenheit. Above 1250 degrees Fahrenheit, the glass begins to soften beyond what is needed for bending the glass to shape during a slump or drape. Temperatures greater than 1250 are high enough to sinter powders, tack fuse pieces of glass, set enamels, and fire polish glass surfaces. A variety of effects can be achieved once the glass begins to soften and before it reaches full-fuse temperatures. Glass artists sometimes talk about heatwork in relation to fused glass. Heatwork is the amount of heat a piece has been subjected to over one or multiple firings. You’ll hear people say that “heatwork is cumul

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