Heat strengthened glass is also called semi-tempered glass. It is a type of glass that introduces a permanent stress layer on the surface of the glass by controlling the heating and cooling process, which improves the mechanical strength and heat impact resistance of the glass and creates glass products with specific fragment characteristics.

Semi-tempered glass is a type of glass that falls between ordinary flat glass and tempered glass. Both are strengthened glass, with the strength of semi-tempered glass being 1-2 times that of ordinary flat glass, while tempered glass is 3-5 times.

The differences between the two are as follows:

Tempered glass is safety glass, which breaks into small particles and will not cause serious harm to people. Relevant departments in the country require the use of tempered glass in certain parts of buildings. Semi-tempered glass is non-safety glass, which still has large pieces of glass and sharp edges after breaking, which can seriously injure people, but there is no risk of spontaneous explosion. It is often used in glass curtain walls.
Tempered glass needs to pass the mandatory (3C) certification of the country and has strict physical and chemical performance testing requirements, and national designated institutions supervise the product performance and production process. Semi-tempered glass also has quality requirements but is not mandatory.
Both require the use of a tempering furnace for heat treatment, but the cooling capacity of semi-tempered glass is lower than that of tempered glass.