Uviol Glass

a glass that transmits ultraviolet radiation with λ < 400 nanometers, the biological region of the spectrum.

Uviol glasses are divided into three groups according to chemical composition: silicate glasses, which contain about 75 percent Si0₂; borosilicate glasses, which contain 68-80 percent Si0₂ and 12-14 percent B₂0₃; and phosphate glasses, which contain about 80 percent P₂0₃. A1₂0₃, CaO, MgO, and other compounds are also present. Quartz glass is also considered to be an uviol glass. Oxides of heavy metals, for example, Fe₂0₃, Cr₂0₃, and Ti0₂, and sulfides of heavy metals that absorb ultraviolet radiation must be absent.

Uviol glass is used in schools, day-care centers, medical facilities, and greenhouses; it also serves as the glass envelopes of germicidal and fluorescent lamps.