It can still be used if it's not broken. It won't explode, but it will leak.

Glass will not explode when heated. The specific analysis is as follows:

1, the process of heating glass into melt is also gradual, and the changes of its physical and chemical properties are also continuous and gradual;

2. Gradients In terms of arrangement, there are gradations of position, direction and osteon. The gradual change of shape can start from a certain shape and gradually change into another shape, or it can gradually change from one image to another completely different image;

3. Explosion refers to the process of transforming energy from one form to another or several forms with strong mechanical effects in a short time and in a small space;

To sum up, it can be seen that the heating process of glass is gradual, which is a relatively long period of time, and the time of explosion is very short, so there will be no explosion during the gradual heating process of glass.