Fused quartz glass has an extremely low expansion coefficient. I think I once read on the internet that it can go from 1500°C into water without cracking from thermal shock. Sometimes people drip what's left over into water to put it somewhere but that type of glass probably wouldn't crack. Also, it can get heated to a really high temperature before it starts softening to a noticeable amount. I think it might also be stronger than soda lime glass. It's probably also extremely insoluble in water unlike soda lime glass. It can also be put in an annealer so that it will cool very slowly and be free of stress after it cools. So why isn't that the normal regular type of glass we use?