Glass is mainly divided into the following 2 kinds:
1. flat glass
Flat glass is also known as white glass or net glass. Its chemical composition generally belongs to the sodium calcium silicate glass, the composition range is: SiO270 ~ 73% (weight, the same below); Al2O30 ~ 3%; CaO6 ~ 12%; MgO0 ~ 4%; Na2O + K2O12 ~ 16%. It has the performance of light transmission, transparency, heat preservation, sound insulation, wear-resisting and climate change-resisting.
The main physical properties of flat glass indicators: refractive index of about 1.52; transmittance of more than 85% (2 mm thick glass, colored and coated with the exception of); softening temperature of 650-700 ° C; thermal conductivity of 0.81-0.93 watts / (m - open); coefficient of expansion of 9 to 10 × 10-6 / open; specific gravity of about 2.5; bending strength of 16 to 60 MPa.
Flat glass is mainly divided into three kinds: namely, leaded-up flat glass (divided into two kinds of grooved/no groove), flat-pulled flat glass and float glass.
2. Specialty glass is relative to ordinary glass, used for special purposes.
On October 27, 2017, the World Health Organization's International Agency for Research on Cancer published a preliminary collation of the list of carcinogens for reference, flat glass and special glass manufacturing in the list of category 3 carcinogens.
Extended information: p>Production process Mainly includes: ① Raw material pre-processing. The lumpy raw materials (quartz sand, soda ash, limestone, feldspar, etc.) are crushed to make the moist raw materials dry, and the iron-containing raw materials are de-ironed to ensure the quality of glass. ②Matching material preparation. 3 melting. Glass with material in the pool kiln or crucible kiln for high-temperature (1550 ~ 1600 degrees) heating, so that the formation of uniform, bubble-free, and meet the molding requirements of the liquid glass. 4 molding. Liquid glass is processed into products of the required shape, such as flat panels and various utensils. ⑤Heat treatment. Eliminate or produce stress, phase separation or crystallization within the glass, as well as change the structural state of the glass through annealing, quenching and other processes. 1. Frosted glass processing methods: First, the flat glass to be processed flat on the worktable padded with coarse tweed or cotton blankets, and then stacked on the glass surface of the appropriate amount of fine adamantine, with a coarse ceramic bowl back to buckle the adamantine, and gently pressed with both hands on the bottom of the bowl to push in a circle. You can also use a higher number of terrazzo ground with the grinding stone grinding. Grinding operation should start from the corners of the surrounding gradually move to the center, until the glass surface grinding is uniform milky white, to achieve light transmission can not see. 2. Silver engraved glass processing methods: First, the flat glass washed with water to dry after full coating of paraffin wax, and then engraved in the paraffin wax into a variety of patterns, with a 1:5 concentration of hydrofluoric acid solution corrosion of the glass surface. Finally, pour away the hydrofluoric acid to remove the paraffin, and use water to clean the glass until it is clean. Others such as stained glass can be laminated or spraying method of processing, the specific method is omitted. On the ground and vertical wall bouncing line, so that the lower wall structure, skeleton columns and beams of the fixed, glass processing and cutting installation of the upper part and all wood (metal) skeleton, glass installation, edging paint and clean up. Reference: