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5014L
Bellwether Crucible Lids (501xL) are glazed all over except for rim. Bellwether crucibles are fired at 1205°C (2201°F) and tested as follows: Porcelain is oven-heated to 1100°C (2012°F), Cooled to 400°C (752°F) in oven, and Removed from oven and further cooled to 20°C (68°F). Note: Cycle must be repeated at least three times to pass.
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