Tempered glass, semi-tempered glass is ordinary glass cut to the required size, then heated to close to the softening point of the glass and then cooled rapidly. After tempering treatment, uniform pressure is formed on the surface of the glass, while tensile stress is formed inside, so that the tensile and impact strength of the glass can be greatly improved, and it is widely used in various places in the construction industry, such as doors, windows, partition walls, furniture, staircase guardrails, balcony guardrails, shower rooms, hotel lobbies and so on.