What is the material of which the transparent part of CD cases are made of? It is nicely rigid and really lightweight.
2 Answers
These are called slimline jewel cases.
From the Wikipedia article on Optical Disc Packaging:
The bulk of slimline cases are made with translucent or transparent polystyrene, and are available in multiple colors. A stronger alternative is made from semi-opaque, semi-flexible polypropylene which is strong enough to protect the disc, but flexible enough not to break easily.
Here is an image of a polystyrene case to compare to yours:
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$\begingroup$ The back part of the case in this picture is HIPS, PS-PB copolymer, as the description on wikipedia says, the transparent front cover plain PS. The case in the OPs picture is likely all standard PS. $\endgroup$– KarlMar 23, 2017 at 20:31
CD jewel cases are made from injection molded polystyrene. Clam-shell alternatives use polypropylene.