Originally Posted by
OakLeaf
Plastic DOES degrade at high temperature, or when it's exposed to organic solvents like body acids and oils and cosmetic products we put on our faces and hair. EPS is especially fragile because of the way the beads are bonded together. It's meant to be fragile. That's the point of it and how it absorbs impact. As I said to Tom way back when, all you have to do is pick up an EPS cup that's been outside for a few months and crumble it in your hands. The beads don't degrade appreciably, I don't suppose, but the bonds between them do, and those are the parts of a helmet that count.
.