Abstract
Oxynitride glass fibers were drawn from the melt in N2 atmospheres. The fibers were tested for their alkali durability in 10% NaOH at 96°C for 6 h. The durability is reported as weight loss in mg/cm2. The photomicrographs of the fibers before and after testing are presented. Calcium silicate oxynitride fibers have good durability because of a protective surface layer of Ca(OH)2. Yttria‐containing glasses have the best durability among the compositions reported here.

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