Each piece of tempered glass has a 3C certification mark.

The tempered mark is a layer of ink printed on the surface of the glass before the tempering process. It is baked at high temperature and bonded to the glass surface to indicate that the glass has been tempered.

The effect shown above can be achieved by printing low-temperature ink on the surface of ordinary glass or tempered glass and baking it at low temperature (around 140°).

Extended information:

Tempered glass is safety glass. In order to improve the strength of the glass, tempered glass usually uses chemical or physical methods to form compressive stress on the surface of the glass. When the glass is subjected to external forces, it first offsets the surface stress, thereby improving the load-bearing capacity and enhancing the glass's own resistance to wind pressure, cold and heat, and impact. Sex etc.

Toughened glass is obtained by cutting ordinary annealed glass into the required size, then heating it to about 700 degrees close to the softening point, and then cooling it quickly and evenly (usually 5-6MM glass is heated at 700 degrees Heating takes about 240 seconds at high temperature and cooling takes about 150 seconds. 8-10MM glass is heated at 700 degrees for about 500 seconds and cooling takes about 300 seconds.