Semi-tempered glass, also known as heat-strengthened glass, is between an ordinary flat glass and glass between species, which combines some of the advantages of tempered glass, such as the strength of the higher ordinary float glass, it is 2 times the normal float glass while avoiding the poor flatness of tempered glass, easy blew, once damage that is not satisfactory overall crushing of weakness.

Semi-tempered glass production process and the same, only the wind pressure quench station of a difference, the cooling rate is less than tempered glass. Semi-tempered glass is annealed glass through high temperature and quenching, surface to form a compressive stress lower than 69MPa, the mechanical strength of glass several times to increase, that is, semi-tempered glass. Semi-tempered glass surface compressive stress between 24MPa to 60MPa, tempered glass surface stress of 69 ~ 168Mpa. Features is the intensity of semi-tempered glass is more than twice annealed glass, and glass is more than four times the strength of ordinary glass strength.

Security: semi-tempered glass damage, radial radial cracks along the crack source, usually no tangential crack, so the damage will extend to the edges of each fragment, not falling, more secure. Deflection: Deflection semi-tempered glass tempered glass smaller than larger than annealed glass. Thermal stability: Thermal stability significantly better than annealed glass, ordinary glass half-treated steel can withstand a temperature difference of about 75 ° C. Semi-tempered glass will not explode. After ordinary glass tempering process can withstand the temperature difference of about 180 ° C.

Monolithic semi-tempered glass (heat-strengthened glass) is not a safety glass, because once broken, will form a large debris and radial cracks, although most pieces no sharp corners, but will still be hurt, and there can not be used for skylights Human impact situations may occur. Semi-tempered glass in the building is suitable for wall and exterior windows, standard practice is made of laminated glass or insulating glass.