CR-39

Poly(allyl diglycol carbonate) (PADC) is a thermosetting plastic commonly used in the manufacture of eyeglass lenses alongside the material PMMA (polymethyl methacrylate). The monomer is liquid allyl diglycol carbonate (ADC). The term CR-39 technically refers to the ADC monomer, but is more commonly used to refer to the finished plastic.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain

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