SG is the symbol of CSG. Usually the trademark on the glass is printed with high-temperature ink, so it can basically be judged to be tempered. Unless the trademark can be scratched off, it may not be tempered.

There is a simple way to determine whether it is tempered. Stand it up and watch the scenery reflected on the glass. If you look at it from different angles, the scenery will show regular wave deformation. You can judge whether it has been tempered or whether it has been tempered. If there is a lot of glass in the resulting glass reinforcement, just blow up a piece. The fragments will be small fragments without large sharp fragments. It is a tempered glass. Extended information

Tempered glass

Toughened glass? (Tempered glass/Reinforced glass) belongs to safety glass. Tempered glass is actually a kind of prestressed glass. In order to improve the strength of the glass, chemical or physical methods are usually used 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. Wind pressure, cold and heat, impact, etc.