PE (polyethylene) and polycarbonate transmission spectrum


1. Is there some open Web resource where I could find transmission
spectrum of polyethylene and polycarbonate films?

2. Is there a commonly recommended resource for optical properties of
various materials, especially plastics? I have found several links to
Polymers FAQ on this list, but the message is dated 1997 and all pages
"cannot be found" now.

TIA! Happy lunar New Year!