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Re: Clear Hatch Lenses
"but, don't want to fry if it gets really hot."
You might want to speak to the 3M division that makes Crystaline, a car window tint material. The lightest shade is practically clear, but the material blocks out osmething like 99% of all IR and UV light, so literally NO heat passes through the glazing.
Crystaline is applied inside the "window", can be removed with ammonia and steam or hot water if need be. Easiest to apply to the glazing before you install it in the hatch frame, of course.
The blocking of IR must mean it gets bounced back into the glazing, which apparently is no problem with auto glass, but I'd want to ask 3M if they've had any issues with that and plexi or lexan. Or, just get a piece and apply it to your existing hatch lens and see how that works.
But it most definitely will give you 99% heat blocking and 99% full visible light, unless you order a "tinted" version as well.
There are other products from a couple of other premium companies, fwiw. I have no idea if any of the plastics come in "UV and IR" blocking flavors but that's also something to explore, since that might be made and sold for structural glazing.