The standard CD ('Jewel' case) cracks easily and, if broken, can scratch the CD. Jewel cases are

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The standard CD ('Jewel' case) cracks easily and, if broken, can scratch the CD. Jewel cases are made of injection moulded polystyrene, chosen because it is transparent, cheap and easy to injection mould. A material is sought to make \(\mathrm{CD}\) cases that do not crack so easily. The case must still be transparent, able to be injection moulded, and able to compete with polystyrene in cost.

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