My splash shield started to craze some time ago, whether because of exposure to coolant or some other solvent I can't be sure. I thought that strange for polycarbonate. Then I dropped it and broke a 4" chunk off the corner, I thought that REALLY strange for polycarbonate. I took it down to a local plastics place and they confirmed that it is in fact acrylic. I replaced it with polycarbonate which I think is a better choice, and got them to cut me a piece 16" tall which will spare me some of the bombardment I occasionally get. The polycarbonate was about 30% more expensive than acrylic.

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