How to prevent double wall glass water bottle from cracking?

The reason for the double glass water bottle cracking is that as soon as hot water is poured into the cup, the inner wall of the water bottle will expand rapidly, but the outer wall of the glass water bottle will remain the same, and the inner glass will suddenly squeeze outward vigorously, and the cup will break. So, how to prevent the double wall glass water bottle from bursting?

1. Submerge the new double wall glass water bottle in the pot with water. Boil the water and take out the glass water bottle after the water is cool, then the double wall glass water bottle will not crack due to sudden cold and heat.

2. When filling the boiling water, put a piece of metal utensils such as copper fork and aluminum spoon in the glass water bottle first, and the glass water bottle will not burst easily.

3. First pour cold water into the glass water bottle, then slowly pour boiling water into the glass water bottle. Because the glass at the bottom of the glass water bottle is thicker than the wall, it is not easy to crack.