Ok, about three years ago I ordered a 12" x 12" x 3/8" sheet of Ultra-High Molecular Weight Polyethylene to use as a mousing surface. Trade name - TIVAR 1000 (there are other variations and trade names from various manufacturers). This stuff is much cheaper than Teflon, but has very close to the same ridiculously low coefficient of friction. It has a bunch of other miraculous physical properties... read more on wikipedia...
When I got this sheet, it had a glossy and slightly uneven surface (due to the manufacturing process i assume), so attacked it with a random orbit sander with some fine grit sandpaper. Anyway, after three years of use there is virtually no visible wear. Due to the way I sanded it, it has a *silky* smooth feel to it. It has a very slight amount of texture but it's soft, not bumpy. It's hard to describe, but it has a "nice" feel to it.
My question is: is this polymer being used for key caps at all? It seems like a fantastic use case for UHMWPE. It can be made with a variety of different colors as well.