Join Date: Dec 2001
Location: Belleville, Illinois
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Re: ==Thick cutting board sheeting as skidplate
Could be any of the plastics you mentioned, but my guess would be polypropylene. It's the stuff milk jugs, and probably cutting boards, are often made of. It's slippery, fairly tough, and very cheap. Some downsides are that it's relatively soft, and can't be glued for shucks.
PVC would probably work if properly supported, but it will crack if bent too much, especially if it's cold. Teflon and Delrin are both pretty expensive, and probably too soft. Nylon would be a good choice, but pricey. UHMW Polyethelyene is probably the most tear and abarasion-resistant material you can find.
Any of the plastics, except possibly Nylon, would need full structural backup. I wouldn't expect them to span more than about four to six times their thickness. Fastening them is a challenge. Because they're all relatively soft, Teflon especially, it would take large flatwashers and flathead machine screws. If a pointed rock dug in, it could tear the sheet loose.
If I were going to do it I'd use UHMW. But then, after building a smooth, flat skid plate I don't know if a plastic cover would add much.
Here are some prices from a catalog that just came in, for 1/4" material per square foot:
Low-density polyethelyene $3.00
High-density polyethelyene $2.35