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

cd case

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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:
image

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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. $\endgroup$ – Karl Mar 23 '17 at 20:31
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CD jewel cases are made from injection molded polystyrene. Clam-shell alternatives use polypropylene.

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It is made of HDPE (high density polyethylene)

It does not have branches like LDPE (low density polyethylene) and therefore can form stronger inter-molecular bonds between chains. This gives it its rigidity and hardness.

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    $\begingroup$ Nonsense. HDPE is highly crystalline, white, and not brittle. What you see on the picture is polystyrene. $\endgroup$ – Karl Mar 23 '17 at 20:29

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