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Posted By: Joann

Clear polycarb naturally blocks substantial amounts of UV without any off-clear toning or additives needed. To the extent that fading is strictly related to UV exposure, use of PC for slabs would at least help, and maybe all but resolve, many fading issues.

Polycarb has some pretty distinct properties in addition to blocking UV. One, you can't kill it. That's why they make safety glasses out of it. However, PC also scratches like nobody's business. It's one of the big drawbacks and would definitely be a negative for slabs. You can add a hardcoat for some scratch protection, but that would probably add to cost.

The other thing is that I don't know how well, if at all, PC can be sonic-welded. I'm pretty sure that's how at least PSA is sealing their slabs. I've never tried to sonic-weld anything PC, but if it is difficult that has to be a consideration too.

Joann