Quote Originally Posted by dacb View Post
This is almost certainly why borosilicate glass is preferred for the application. I'd be curious to hear from someone who has used it.
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.