Borosilicate glass is the thermal-shock-resistant glass used on glass drinkware lines. It survives sudden temperature changes, such as boiling water into a cold vessel, far better than ordinary soda-lime glass.

That resistance comes from its composition, which expands less with temperature change than soda-lime glass. It also handles freezer-to-hot transitions with far fewer cracks.

Many glass bottles marketed as thermal-shock resistant are borosilicate; ask for the glass type if the product will be sold for boiling water.

Unlike steel, glass shows its contents, which some buyers value for fruit-infused water and tea. That transparency also makes any scratches or mineral film visible, so cleaning matters. Soda-lime glass is cheaper but cracks more readily under thermal shock, so it suits cold drinks rather than boiling-water use.

The trade-off is weight and cost. Borosilicate is heavier than steel for a given part, and it can still break on hard impact.

Practical takeaway: Choose borosilicate for glass bottles and mugs intended for hot liquids and temperature swings, and plan for heavier shipping weight.