The production of automobile glass is by heating the glass in a heating furnace to near the softening temperature, and then quickly sending the glass into the wind grid with different cooling strengths, and the glass is unevenly cooled, so that the main viewing area of the glass and the surrounding area are different. Stress, generally this kind of produced glass is regional tempered glass.
The surrounding area is in the strong wind position of the wind grid, so it needs to be fully tempered. The fragmentation degree at this location is good, and the toughening strength is high. The main viewing area is in the weakly cold position of the wind grid, with large fragments and low strength.