| 摘要 |
FIELD: silicates, composition of glasses for making beads. ^ SUBSTANCE: bead making glass contains, mass %: SiO2 56-62;, Al2O3 1-3; CaO 6-8; BaO 6-8; ZnO 1-3; Na2O 6-10; K2O 6-10; B2O3 4-6; As2O3 0,5-1. Beads made of glass, have no bubbles visible to the eye, no cords, and are of distinguished decorativeness. ^ EFFECT: increased quality of glass which is useable for making beads. ^ 1 tbl |
