GLASS WITH HIGH LEAD CONTENT Russian patent published in 2015 - IPC C03C3/102 

FIELD: chemistry.

SUBSTANCE: crystal glass with a high content of lead is especially suitable for the production and improvement of glass jewellery, decorative and household articles, including chandelier pendulums and half-finished products. The said glass contains, wt %: 48-53 quartz SiO₂, 30-33 lead monoxide PbO, 10-13 sum of potassium oxide and sodium oxide K₂O+Na₂O, 1-3 calcium oxide, CaO, 0.5-1 zink oxide ZnO, 0.5-1 boron trioxide B₂O₃, less than 0.3 barium monoxide BaO, less than 0.3 aluminium oxide Al₂O₃, 0.2-0.5 antimony trioxide, 0.006-0.01 iron oxides.

EFFECT: increase of the refractive index higher than 1,58, increase of light transmission, mechanical and chemical stability.

6 cl, 2 ex