After A, ordinary sheet glass by the cutting , milling , cleaning and other pre-processing, steel production line into steel processing . Steel production line is mainly composed of the composition of the furnace and the cooling air gate , also including the production of curved glass compression molding station . First, the glass was heated in an electric furnace into the heating furnace to about 600LC, this temperature has reached the softening point of glass . The glass is then heated rapidly to a good cooling station , a uniform strong wind blowing fan through two air grid large area glass , the glass is rapidly cooled , the contraction of the internal surface of the first cooling, the internal cooling, when gradually cooling the internal closed places its internal pre- cooled by the outside surface of the constraints , thus forming the surface layer of the compressive stress, tensile stress is formed inside .
B, glass, semi- tempered glass is heated and quenched ordinary glass surface obtained after the treatment with strong mechanical strength and a uniform stress of the glass increases exponentially . Tempered glass surface compressive stress 95MPa or more, semi-tempered glass surface compressive stress between 24-69MPa. Tempered glass Features: Safety: broken glass after a honeycomb-like particles Suixiao obtuse , will not cause significant harm to the human body . High intensity: tempered glass is typically four to five times that of ordinary glass ; hardness : Big 3 to 4 times higher than ordinary glass ; thermal stability: tempered glass has good thermal stability, can withstand temperatures is three times that of ordinary glass , can withstand 300 ℃ of temperature changes . Tempered safety glass is widely used for mechanical strength and safety requirements of the higher places . Such as: glass doors, building walls, facades windows, interior partitions , fixtures, close to the heat source and subject to severe thermal shock than the blocking position .