Excuse me, does tempered glass have 3c certification mark? For example, is the logo a regular 3c logo? Thank you, my friend,

Each tempered glass has 3C certification mark.

Tempering mark is a layer of ink printed on the glass surface before tempering. After high temperature baking, it sticks to the glass surface, indicating that the glass has been tempered.

Even printing low-temperature ink on the surface of ordinary glass or tempered glass and baking at low temperature (about 140) can achieve the effect shown in the above figure.

Extended data:

Tempered glass belongs to safety glass. Tempered glass in order to improve the strength of glass, chemical or physical methods are usually used to form compressive stress on the surface of glass. When the glass bears external force, the surface stress is firstly offset, thus improving the bearing capacity and enhancing the wind pressure resistance, cold and heat resistance and impact resistance of the glass itself.

Tempered glass is made by cutting ordinary annealed glass into required sizes, then heating it to about 700 degrees near the softening point, and then rapidly and uniformly cooling it (usually, 5-6MM glass is heated at 700 degrees for about 240 seconds, and the temperature is reduced by about 150 seconds). 8- 10MM glass is heated at 700℃ for about 500 seconds and cooled for about 300 seconds.