Difference between ordinary flat glass and float glass

Difference between ordinary flat glass and float glass

Ordinary flat glass and float glass are both flat glass. Only the production process and quality are different.

Ordinary flat glass is made of quartz sandstone powder, silica sand, potash fossil, soda ash, Glauber's salt and other raw materials according to a certain proportion, melted at high temperature in a furnace, and produced by vertical leading up method, flat drawing method and rolling method. According to the appearance quality, ordinary flat glass can be divided into three categories: special products, first-class products and second-class products. According to the thickness, it can be divided into 5 types: 2, 3, 4, 5 and 6 mm.

Float glass is made of sea sand, quartz sandstone powder, soda ash, dolomite and other raw materials according to a certain proportion. After melting at high temperature in the furnace, the glass liquid continuously flows from the tank to the metal surface and floats on the metal surface. After cooling and hardening, the float glass is separated from the liquid metal, and then annealed and cut. The glass surface is especially smooth, the thickness is very uniform, and the optical distortion is very small. According to the appearance quality, float glass can be divided into three categories: superior products, first-class products and qualified products. According to the thickness, it can be divided into 7 types: 3, 4, 5, 6, 8, 10 and 12 mm.

The appearance quality grade of ordinary flat glass is determined according to the number of defects such as ripple, bubble, scratch, sand, pimple and line. The appearance quality grade of float glass is judged by the number of defects such as optical deformation, bubble, inclusion, scratch, line, fog spot, etc.