Patent ID: 7491668

Claim:
A chemically resistant borosilicate glass with a composition comprising: SiO 2 67-74% by weight B 2 O 3 5-10% by weight Al 2 O 3 5-10% by weight Li 2 O 0-4% by weight Na 2 O 0-10% by weight K 2 O 0-10% by weight, wherein Σ Li 2 O + Na 2 O + K 2 O 0.5-10.5% by weight, MgO 0-2% by weight CaO 0-3% by weight SrO 0-3% by weight BaO 0-3% by weight ZnO 0-3% by weight, wherein Σ MgO + CaO + SrO + BaO + ZnO 0-6% by weight, ZrO 2 0-3% by weight CeO 2 0-1% by weight TiO 2 0-10% by weight Bi 2 O 3 0-10% by weight MoO 3 0-10% by weight, wherein Σ TiO 2 + Bi 2 O 3 + MoO 3 0.1-10% by weight; and wherein at least 80% by weight of titanium present in the glass has an oxidation state of +4 when said titanium is contained in the glass.