Patent ID: 7951312

Claim:
A borosilicate glass with UV-blocking properties for pharmaceutical packaging, said borosilicate glass comprising, in wt. % on the basis of oxide content: SiO 2 60-80 B 2 O 3 8.2-15 Al 2 O 3 2-10 TiO 2 0.5-7 Σ Li 2 O + K 2 O + Na 2 O 3-10 Σ alkaline earth oxides 0.5-10 ZrO 2 0-3 Fe 2 O 3 0-0.2; and a glass transition temperature Tg of 550° C. to 590° C., a processing temperature V A of 1100° C. to 1200° C. at a viscosity of 10 4 Pa s, a transmission π of at least 80% at a wavelength of 400 nm, and a transmission π of less than 0.1% at a wavelength of under 260 nm, each for a sample thickness of 1 mm, and wherein the borosilicate glass is made by melting under oxidizing conditions.