I've carried this nugget of possibly-bogus information for neary 40 years.
I made a replacement windshield for my race car out of Lexan and tried to
bend it as I had the original Plexi one. However, I got a diffusion of tiny
bubbles throughout the plastic in the area I heated.
At the time, the glass guy who'd given me the Lexan told me that it was
because that was UV-stabilized Lexan. He said the UV stabilizer was just
water and when heated it turned to steam, making the bubbles.
Truth or BS ???
Karl
> During my years in aerospace R&D I used a lot of plexi and lexan for
> prototypes, and used a heat gun (hair dryer couldn't get hot enough) to
> make
> all sorts of smooth shapes.
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