What is the material of which the transparent part of CD cases are made of? It is nicely rigid and really lightweight.

cd case


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:

  • $\begingroup$ 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. $\endgroup$
    – Karl
    Mar 23 '17 at 20:31

CD jewel cases are made from injection molded polystyrene. Clam-shell alternatives use polypropylene.


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