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When fired, warm glass expands. For glass projects to be successful, you must use glass that expands at the same rate. By using glass with the same Co-efficient of Expansion (COE), you ensure that your warm glass projects will fire evenly and turn into functional glass art, great for jewelry and home decor. All the products on this page are COE 90 and compatible with each other. Also see our page for COE 96 glass!