To temper glass they heat regular glass (Float glass) red hot and then cool it with 500 HP fans on each side to cool it down quick. Just like heat treating steel.
The reason they have a minimum size is that most of the small pieces don't survive the tempering process. (They explode)
I don't know about AB but here in BC there are only three places that temper glass and none that do bent temp.
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150 Gal system 3'x3' 400W M/H, Bekett skimmer, Dart return,1/4 HP Chiller
180 Gal Drop tank, LED lights, Bubble master 250 skimmer,Hammerhead on a closed loop, Speed wave return.
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