You can easily replace the screen material. I would recommend lexan instead of plexiglass for the inserts. Costs a little more, but much more scratch resistant.
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Lexan = polycarbonate
plexiglas = acrylic
just an FYI.... you may have the properties of polycarbonate vs acrylic confused with each other
Lexan and Plexiglass are trade names.
the polycarbonate, has a much higher impact resistance, but a
much lower scratch resistance than acrylic...
the acrylic is more scratch resistant, but is more prone to cracking as it ages, as the impact resistance lowers with uv exposure...
BOTH types can be purchased with scratch resistant coatings, or coatings for higher UV resistance, and/or a bit of a reflective coating.... all of these coating are relatively tough but can be worn off if care is not taken...
replacing the screen in a screen door with plexiglas would be the best choice, for longevity... the window will need to be wiped/washed, but really takes no hard impact, so the lexan, which should have a scratch resistant coating (if you want it to remain crystal clear) would be overkill and twice as expensive...
polycarbonate is commonly used for making bullet-proof glass... acrylic is commonly used as a replacement for actual window glass...
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JimB helped us procure tinted Lexan already cut to fit for the top, bottom and slider. Unfortunately our measurements were off about 1/8”, and in the process of trying to make it fit, we cracked the top pice of Lexan. So we have it on the bottom and slider only, leaving the top part as screen only. This way we get some breeze through the door and protect the bottom screen from cat claws. The tint also cuts the heat somewhat.
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if it cracked, it wasnt really lexan.... lexan is strong and tough can be folded in half without breaking.... the extremely tough bubble packaging material that some items are sold in, is polycarbonate... the same as lexan