What polymer is used to make CDs, safety goggles and riot shields?

The story behind the answer

Polycarbonate is a clear, tough thermoplastic that can be precisely injection-molded—perfect for CDs, which need optical clarity and dimensional stability so lasers can read data. The same material’s exceptional impact resistance and shatterproof nature make it ideal for safety goggles and riot shields, providing strong, lightweight protection compared to glass.

Context tip: Polycarbonate is sold under