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Polycarbonate
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Polycarbonates are a group of thermoplastic polymers containing carbonate groups in their chemical structures. Polycarbonates used in engineering are strong, tough materials, and some grades are optically transparent. They are easily worked,... Wikipedia
Life expectancy: 10 to 20 years
Abbe number (V): 34.0
Abrasive resistance ASTM D1044: 10–15 mg/1000 cycles
Acids—concentrated: Poor
Acids—dilute: Good
Alkalis: Good-Poor
Coefficient of friction (μ): 0.31