Softening temperature, chemical stability

- Jun 27, 2018-

Lead glass is used in the manufacture of optical glass, electric vacuum glass, low temperature sealing glass, radiation protection glass, lead crystal glass, flint optical glass, low melting glass, delay line glass, high refractive microbead glass, and art glassware.

In addition to glass-forming materials such as silicon dioxide and boron trioxide, glass containing a large amount of lead oxide is contained.

The compositional formula of lead glass is: RmOn-PbO-SiO2 (B2O3). In the formula, SiO2 (B2O3), ie, silicon oxide (boron oxide), is referred to as a network former and is a basic unit constituting a glass network structure. RmOn, representing metal oxides of alkalis, alkaline earths, and rare earth metals, is a network modification that changes the structure of the glass network and achieves tuning properties. PbO, lead oxide, is a characteristic component that imparts basic properties to glass. With the increase of PbO content, the glass's density, refractive index, dispersion, dielectric constant, X-ray and γ-ray absorption coefficient and other performance index values increased; its hardness, high temperature viscosity, softening temperature, chemical stability and other index values decreased; As a result, the glass molding material becomes longer, the color of the colorant is brighter, the surface gloss is increased, and the knocking sound is crisp.