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That might be the problem as the material may discolour with the heat cycles/uv infra red too.
Lexan and plexiglass do have a technical support so might be worthwhile to drop them an email.
Thinking about this laterally, you can get plastic splashbacks/wall coverings in commercial kitchens, that stay smooth for cleaning and may cover the heat range that you need.
lynx
CYOA
Thanks - heat is a tricky one as it won't be under constant heat, just very hot blasts for a few hours here and there (lots of hot lights a few feet away shining at it).