| 摘要 |
Leadless crystal glass with refraction index equal or higher as 1,52, determined mainly for manufacturing of glass jewelry semiproducts, chandelier appendages, pressed glass for household and glass bars and beads with possibility to use it for bevel and ball cut of glass, which contains 64 to 73 per cent weight of silicon dioxide (SiO/sub_2/), 6 to 12 per cent weight of sodium oxide (Na/sub_ 2/O), 4 to 10 per cent weight of potassium oxide (K/sub_2/O), 4,5 to 9,5 per cent weight of magnesium oxide (MgO) and/or calcium oxide (CaO), 2 to 6 per cent weight of barium oxide (BaO), 1 to 3 per cent weight of zinc oxide (ZnO), 0,2 to 1,5 per cent weight of boron oxide (B/sub_2/O/sub_3), 0,2 to 15 per cent weight of lithium oxide (Li/sub_2/O) and/or fluorides (F/exp_1-/), 0,2 to 0,8 per cent weight of antimonius oxide (Sb/sub_ 2/O/sub_3/) and/or arsenous oxide (As/sub_ 2/O/sub_3/), at which the total amount of zinic oxide (ZnO), potassium oxide (K/sub_2/O) and barium oxide (BaO) is more then 10 per cent weight. Glass with advantage contains 0,5 to 2 per cent weight of aluminum oxide (Al/sub_2/O/sub_3/), respectively traces of sulfates ((SO/sub_4/)/exp. 2-/) to 0,4 per cent weight.
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