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What causes cracking & crazing in Acrylic & plastics

The majority of times you see cracking and crazing in plastics such as Acrylic, Perspex, Plexiglas (PMMA), Polycarbonate (PC) and Ultem (PEI) is due to lack of the correct heat treatment.  These such plastics need careful normalising and annealing steps throughout the machining, bonding and polishing process.