In the United States, the US Department of Transportation's National Highway Traffic Safety Administration (NHTSA) has approved the use of PC for all non-windshield glazing applications provided that it meets all existing auto glazing specifications for laminated glass as prescribed in the Federal Motor Vehicle Safety Standard (FMVSS) No. 205. This includes < 2% delta haze in the all-important Taber 1000 abrasion test. However, uncertainty over long term weathering and compliance with the ANSI regulation has held back adoption of PC glazing in the US.
Technical data on polycarbonates
Density = 1.20 g/cm3
Use range from -100°C to +135°C
Melting point around 250°C
Refractive index equal to 1.585 ± 0.001
Light transmission index equal to 90% ± 1%
Poor weathering in an ultraviolet (UV) light environment.