Quote Originally Posted by clough42 View Post
You're hearing from one now.

This is what I'm using:

http://rover.ebay.com/rover/1/711-53...mtid=824&kw=lg

I have a high-power silicone bed heater, and I was exploding ordinary window glass. It turns out I was going a little too hot (140C) due to a thermistor configuration problem, but the heater was getting there so fast that the glass couldn't take the thermal stress and it was shattering. The borosilicate glass takes it just fine. I have since fixed my thermistor issue, but I still use the borosilicate glass.

Terrific information. So even with the borosilicate you see deformation of the glass plane? Interesting.