Assertion: astronaut's helmet | /r/MadeOf | polycarbonate
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Source sentences:
text: The helmet is made from polycarbonate, the same material found in bulletproof glass, to provide protection from tiny fragments of rock known as micrometeorites and other debris that would smash normal glass.
text: The helmet is made from polycarbonate, the same material found in bulletproof glass, to provide protection from tiny fragments of rock known as micrometeorites and other debris that would smash normal glass.