Patent ID: 8283269

Claim:
A solarization-resistant glass having a UV-cutoff with a definite or predetermined transmittance gradient, said solarization-resistant glass having a composition, in percent by weight on the basis of oxide content, comprising: SiO 2 55-82 B 2 O 3 10-20 Al 2 O 3 1-10 Li 2 O 0-5 Na 2 O 0-10 K 2 O 0-10 Σ alkali oxides 0-10 MgO 0-5 CaO 0-10 SrO 0-5 BaO 0-15 Σ alkaline earth oxides 0-15 ZrO 2 0-3 ZnO 0-5 CeO 2 0-2 WO 3 0-3 SnO 2 0-2 Fe 2 O 3 as impurity 0-0.1 MoO 3 0.15-0.25 Bi 2 O 3 0-5 TiO 2 0-1 Oxides of Rh, Hf, Ta, Re, Os, Ir, 0-5; Pt, La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and with a transmittance curve within a corridor or area bounded by respective curves defined by corresponding equations τ=1.7·(λ−277) and τ=1.6·(λ−284) in a wavelength range of from 283 nm to 325 nm, wherein τ is transmittance in percent and λ is wavelength in nm.