cullet
waste glass
Quick Summary
Cullet is broken or refuse glass, typically of the same composition as the raw materials used in glassmaking. It is usually added to a glass batch in amounts ranging from 25 to 60 percent.12
The primary purpose of including cullet in the glassmaking process is to facilitate melting. Because cullet melts earlier than the mineral ingredients, it helps to bring those particles together, accelerating the chemical reactions needed to form glass. This addition speeds up the overall melting process in the furnace.21
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