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???????????? uth

There are quite a few forms of Lexan some are definitely overkill for what you need, Your UTH should give off significantly lower temperatures then the Flame rating of any form of Lexan, when we did some heavy bending on a sheet for a painting enclosure a year or 2 ago we used an Acetylene torch on low (still bloody hot!) to soften it for the forming and we cut it with a metal grade cutting zip-blade on an angle grinder so its pretty strong stuff. You might want to look at LEXAN® MR10 though as it is more resistant to scratching then the general purpose 9k series stuff we used. We cursed a few times on the job when something little in the task put scratches on the finished product, it would depend on how much traffic you'd expect to have around it I guess though and how big a deal it is, you can buy stuff to buff out the scratches too.

Hope that helps some. I'm planning to use some myself, but on a custom top enclosure I am designing for a vivarium, not a bottom, that will be made of an old 45 long aquarium I have.

Good luck and would love to see the design/finished product if you do go with the it.
 
I got your answer for sure. I've had two small UTHs on a 3/16" lexan plate under my hot side for 2.5 years and they work just fine. The temp through the plastic into the Reptibark keeps it at 82F-83F easy, and can make it to 85-86 if I want, but she don't like that. There is no damage to the lexan, and the surface of the lexan is not too hot for the snake. I was worried, too, so I set it up first and tested it.
 
Uh, sorry, measured my lexan, it's 1/4" thick. The stuff I have is very strong, but can be scratched. I have taken a 1" wide strip, bent it completely in half 3 times crunching it flat it a vise each time, on the third bend it cracked but did not break.
I have made a large 2 piece door for a JCB backhoe out of it with NO edging material. As far as I know it is still being used and the last time I saw it there was haziness and scratches near the door handle, but the rest was still clear.
 
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