OPTIC GLASS Russian patent published in 1995 - IPC

FIELD: production of optic details and optic fibers. SUBSTANCE: proposed glass contains (mol %): aluminium fluoride having essential formula AlF₃ 32-35, yttrium fluoride having essential formula YF₃ 2.5-11.4, barium fluoride having essential formula BaF₂ 2.5-11.4, calcium fluoride having essential formula CaF₂ 13.9-21.7, strontium fluoride having essential formula SrF₂ 13.9-21.7, magnesium fluoride having essential formula MgF₂ 12.5, barium phosphite having essential formula Ba(PO₃)₂ 1-8, europium oxide having essential formula Eu₂O₃ 0.1-0.5, zerium oxide having essential formula CeO₂ 0.25-1. Maximal volume of glass sample without crystalline impurities is 90-370 cm³. EFFECT: improves quality of glass. 1 tbl