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? Toughness and impact strength: PC ＞ PMMA, PMMA is a brittle material
? Temperature resistance: PC ＞ PMMA, TG of PC is 120 °, PMMA is 85 °
? Light transmittance: PMMA ＞ PC, the light transmittance of PC is 86% - 89%, and the light transmittance of PMMA is 88% - 91%
? Hardness: PMMA ＞ PC, the surface hardness of PMMA is generally 3H-5H, there is no hardness index on the surface of ordinary PC, and the hardness of hardened PC is HB
? Weather resistance, aging resistance and corrosion resistance: PMMA ＞ PC, PMMA has very good weather resistance and aging resistance, is commonly used in outdoor products, and has strong corrosion resistance to acid, alkali and salt; PC is not alkali resistant and needs to be coated with UV, and UV resistant additives and antioxidants are usually needed for outdoor products

? PET, with good fatigue resistance, abrasion resistance and dimensional stability, low wear and high hardness, has the largest toughness in thermoplastic
? The outstanding properties of PET compared with PC are friction resistance, high rigidity and hardness. The common PET materials used in mineral water bottles, as well as some nickel logo
? PET common material thickness (unit: mm) :0.05/0.075/0.1/0.125/0.178
? Purpose difference: PET is mainly used for fiber, and a small amount is used for film and engineering plastics; PC material is mainly used to produce industrial products, to replace metal and other alloys, and to make impact resistant and high-strength parts in the mechanical industry.