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 starboard, these sheets and bars won’t degrade when exposed to salt water, humidity, and UV light.

Composed of high-density polyethylene fibers, this durable material is tear and water resistant and keeps its high strength in both wet and dry environments.