After homogenization of tempered glass, the possibility of self-explosion cannot be ruled out.

1. The main reason for the self-explosion of tempered glass:

One is: self-explosion caused by visible defects in the glass, such as sand, stones, bubbles, infiltrate, burst, notch, crack texture, scratches, etc .;

Second: self-detonation caused by phase expansion volume expansion of internal nickel sulfide (NiS) impurities in the glass.

2. Nickel sulfide is always present in the glass as non-vitreous material particles, which is the most important factor leading to the self-explosion of tempered glass. Nickel sulfide is carried into the glass by impurities in the raw materials for producing glass (quartz sand, silica powder, etc.). Some nickel sulfide particles change their crystal structure from the α state to the β state after a period of time. During this transition, the volume of the nickel sulfide particles expands greatly. This volume expansion process creates strong internal stress in the tempered glass, causing the tempered glass to explode.

3. Homogeneous treatment (also called hot dip treatment) of the secondary heating and annealing of tempered glass is a recognized effective method to solve the problem of self-explosion. Heat the tempered glass to about 290 ~ 300 degrees Celsius again, and keep the temperature slowly after a certain period of time, so that the nickel sulfide particles in the tempered glass will complete the crystal phase transformation during the homogenization treatment, so that the glass that may explode may break in advance in the factory. This method can effectively reduce the self-explosion rate of tempered glass after leaving the factory, improve the yield rate, and reduce the impact of transportation, installation and rework on subsequent processes caused by self-explosion.