초록 ▼

Borosilicate glass weak in boric acid having a high chemical stability with an alkali resistance according to DIN 52 322 of LBK-Class 1, a thermal expansion a20/300 between 4.0 to 5.3×10-6K-1, a ratio aag(ag(at250 nm/1 mm of 0 to 70% or t300 nm/1 mm of 0 to 91% of the composition in percent by weigh

Borosilicate glass weak in boric acid having a high chemical stability with an alkali resistance according to DIN 52 322 of LBK-Class 1, a thermal expansion a20/300 between 4.0 to 5.3×10-6K-1, a ratio aag(ag(at250 nm/1 mm of 0 to 70% or t300 nm/1 mm of 0 to 91% of the composition in percent by weight on oxide basis of: SiO2>75; B2O3 1 to 2O3 3 to 6; Li2O 0 to 4; Na2O 0 to 8; K2O 0 to 6; MgO 0 to 3; CaO 0 to 3; BaO 0 to 2; SrO 0 to 2; ZnO 0 to 3; ZrO2 0 to 3; SnO2 0 to 3; SnO 0 to 3; TiO2 0 to 2; CeO2 0 to 2; Fe2O3 0 to 1; with SiO2+B2O3>83; SiO2:B2O3>8; SiO2+Al2O3+ZrO2>83; Li2O+Na2O+K2O 5 to 10; MgO+CaO+BaO+SrO+ZnO>3.

대표청구항 ▼

A borosilicate glass composition weak in boric acid having a high chemical stability, an alkali resistance in accordance with DIN 52322 of LBK-Class 1, a radiation transmittance and a UV transmission t250 nm/1 mm of 0 to 70% or t300 nm/1 mm of 0 to 91% a thermal expansion a20/300 between 4.0-5.3×10-

A borosilicate glass composition weak in boric acid having a high chemical stability, an alkali resistance in accordance with DIN 52322 of LBK-Class 1, a radiation transmittance and a UV transmission t250 nm/1 mm of 0 to 70% or t300 nm/1 mm of 0 to 91% a thermal expansion a20/300 between 4.0-5.3×10-6K-1, a ratio aag(ag(a4 to 8, and, a glass transformation temperature between 500°C. and 600°C., said glass composition comprising in percent by weight on oxide basis: ________________________________ - SiO2 >75 B2O3 1-2O3 3-6 Li2O 0-4 Na2O 0-8 K2O 0-6 MgO 0-3 CaO 0-3 BaO 0-2 SrO 0-2 ZnO 0-3 ZrO2 0-3 SnO2 0-3 SnO 0-3 TiO2 0-2 CeO2 0-2 Fe2O3 0-1 with SiO2 +B2O3 >83 SiO2:B2O3 >8 SiO2 +Al2O3+ZrO2 >83 Li2O +Na2O +K2O 5-10 MgO +CaO +BaO +SrO +ZnO ≤3. ________________________________