Patent ID: 6878653

Claim:
An ultraviolet ray-absorbing, colorless and transparent soda-lime-silica glass wherein the glass is prepared by irradiating a cerium containing soda-lime-silica glass with light having wavelengths in the far- to near-ultraviolet region and thereby reducing transmittance to light with wavelengths in the region of 300-400 nm, wherein the reduction in transmittance, measured as transmittance after irradiation/transmittance before irradiation, is ≦0.9 when assessed employing transmittance to light having a wavelength of 350 nm measured with a 3.5-mm thick sample as an index, wherein the glass comprises, in % by weight, SO 3 0.15-0.35% Cerium oxide 0.12-0.19% (calculated as CeO 2 ) Fe 2 O 3 0.02-0.04% FeO 0-0.004% Manganese oxide 0.007-0.06% (calculated as MnO), and Cobalt oxide 0-0.0003% (calculated as CoO).