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How is glass made heat resistant?

How is glass made heat resistant?

How is Heat Resistant Glass Made? Heat-resistant glass is a select type of glass that can endure a high range of temperature differentials. It is usually made using soda lime, silica sand, and some added a heat-resistant chemical. Boric oxide is usually mixed with the molten glass before subjecting it to a furnace.

Does glass break from cold to hot?

Glass expands when hot, contracts when cold. It's not really very conductive so when you have a piece of glass as in a container, that has been heated throuroghly, and you fill it with cold liquid, the external glass remains hot and the internal glass because of the contact with the liquid gets cold quickly.