A glass fiber comprising core glass and clad glass, wherein the core glass consists essentially of from 25 to 70 mol % of Bi.sub.2 O.sub.3, from 5 to 74.89 mol % of B.sub.2 O.sub.3 +SiO.sub.2, from 0.1 to 30 mol % of Al.sub.2 O.sub.3 +Ga.sub.2 O.sub.3, and from 0 to 10 mol % of CeO.sub.2.

Een glasvezel bestaand kern uit glas en bekleed glas, waarin het kernglas hoofdzakelijk uit van 25 tot 70 mol% van Bi.sub.2 O.sub.3, van 5 tot 74,89 mol% van B.sub.2 O.sub.3 + SiO.sub.2, van 0,1 tot 30 mol% van Al.sub.2 O.sub.3 + Ga.sub.2 O.sub.3, en van 0 tot 10 mol% van CeO.sub.2 bestaat.

 
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