Practically nonabsorbent, HDPE won't swell when exposed to moisture. It is denser and more rigid than LDPE, plus it's more chemical resistant.

Also known as pipe-grade HDPE, these sheets are about four times more impact resistant than standard HDPE and hold up outdoors, and in wet environments.

Packs include one 2” square of ABS, Delrin® acetal, LDPE, HDPE, UHMW, nylon, cast nylon, polyester, polystyrene, Rexolite polystyrene, and Noryl PPO.