Abstract
The initial strength and degradation of strength in multi-component glass fibers are reported. Plastic-coated glass fibers with an initial strength of 300–350 km/mm 2 are obtained by excluding the causes of extrinsic origins of fracture; bubbles, small crystals and platinum particles. Degradation of strength is strongly dependent on the glass composition, especially on the network modifier content. The addition of Al 2O 3 and B 2O 3 is useful for suppressing degradation of strength. Multi-component glass fibers which show no degradation of strength for 5000 h under stress-free and atmospheric conditions have been prepared with borosilicate glasses containing 1–5 mol.% Al 2O 3.
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