| 摘要 |
A glass is composed in per cent by weight of: SiO2, 46-60; B2O3, 3-8; Al2O3, 5-12; ZrO2, 1-5; TiO2, 0-6; CaO, 4.5-10; MagO, 1.5-2.7; BaO, 1-4; ZnO, 2-9; Na2O, 6-7.8; K2O, 1.5-3.5; Li2O, 0-2; Fe 0-1.2; F, 1-3.5. The following conditions apply: <FORM:1038813/C1/1> Fibres, e.g. of diameter 3-4 m , may be formed from the glass, as may fritted products. The glass has viscosity 1000-3000 poise at 1000 DEG -1050 DEG C. |
