Flat glass is also called white glass or clear glass. Its chemical composition generally belongs to soda lime silicate glass, the composition range is: SiO 270 ~ 73% (weight, the same below); Al2O 30 ~ 3%; CaO 6 ~ 12%; MgO 0 ~ 4%; Na2O + K2O 12 ~ 16%. It has the properties of light transmission, transparency, heat preservation, sound insulation, wear resistance and weather resistance. The main physical properties of flat glass: refractive index of about 1.52; transmittance of more than 85% (except for 2mm thick glass, except for colored and coated); softening temperature of 650 ~ 700 ° C; thermal conductivity of 0.81 ~ 0.93 watt / (M · K); expansion coefficient 9 ~ 10 × 10-6 / open; specific gravity of about 2.5; bending strength of 16 ~ 60 MPa.
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