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 a transparent colorless flat plate produced by using quartz sandstone powder, silica sand, potassium fossil, soda ash, mirabilite and other raw materials in a certain proportion, melted at high temperature in a melting furnace, and produced by vertical pull-in method or flat-draw method and calender method glass. Ordinary flat glass is divided into three categories: special products, first-class products, and second-class products according to the appearance quality. It is divided into five types according to thickness, as 2mm, 3mm, 4mm, 5mm, 6mm.
Float glass is prepared from sea sand, quartz sandstone powder, soda ash, dolomite and other raw materials in a certain proportion. After melting at a high temperature in the melting furnace, the glass liquid flows continuously from the tank kiln to the surface of the metal liquid and spreads evenly. A flat, fire-polished glass ribbon is a transparent, colorless flat glass made of metal liquid after cooling and hardening, and then annealed and cut.
The glass surface is particularly flat and smooth, the thickness is very uniform, and the optical distortion is small. According to appearance quality, float glass is divided into three categories: superior product, first-class product and qualified product. It is divided into seven types according to thickness: 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, and 12mm.
The quality level of ordinary flat glass appearance is judged according to the number of defects such as corrugations, bubbles, scratches, grit, concrete, and lanes.
The quality grade of float glass appearance is judged based on the number of defects such as optical deformation, bubbles, inclusions, scratches, lines, and fog.
