In the alkali zinc silicate glass system for a fiber optic core glass light guide and fibre optic ca

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It is a new core glass in the alkali zinc silicate glass system for a fibre optic cable described, in mole percent on an oxide basis contains 54.5-65 SiO 2, 18.5-30 ZnO, 8-20 Σ alkali metal oxides, 3 2 O 0.5-3 La, 2-5 ZrO 2, 0.02-5 HfO 2, 2.02-5 ZrO 2 2 + HfO, 0.4-6 BaO, SrO 0.0-6, 0-2 MgO, CaO 0-2, 0.4-6 Σ alkaline earth oxides, 2 O 0.5-3 Li, but not more than 25% of the sum of the alkali metal oxides 2 O Li, > 58.5 Σ 2 +2 +2 and wherein said SiO ZrO 2 O ratio Na HfO : K 2 O 1 : 1.1 to 1 : 0.3 and the ratio ZnO : BaO greater than 3.5 : 1 is and a fibre optic cable with same.