PVCx or XPVC or any other number of abbreviations is expanded PVC. One name brand is Sintra. The most common use you'd see this for is in signs. Think of the big plastic ones businesses use, with flourescent lights behind them so they glow. Basically, it looks like a solid colored plexiglass.

To buy it, you'd have to get it from a distributor, or a sign shop. I was thinking about building some cages out of it, and it was going to be $60 for a 4x8 sheet for me to get ahold of it. If you're only enclosing a heat pad, you may be able to get big enough pieces from a sign shop cheap. Ask around, and see if you can get the scraps they have left over from jobs. You never know- they may have something that would work perfect, and since it's their garbage, they'd probably sell it cheap.

I've heard working with PVCx is a little difficult, but I've never done it myself. You have to be slow, and careful, because it's easy to mess up, and expensive. To cut it to seal heat pads, you could probably just cut it with a fine toothed circular or table saw.

And to use that, I'd recommend using Flexwatt, or a similar product. Any of those cheap flat heat pads that are the same as Flexwatt, except they come pre-wired would probably work.

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