AR Fiberglass Roving used for spray up or mechanical continuous forming GRC. Soaked in 100 °C; saturated Ca (OH)2 insulation for 4 hours, remained filament strength > 82%, diameter diminution <0.5% (tested in naked fiber without size and coating) Soaked in 100°C, 10% NaOH insulation for 1 hours, weight loss <0.5%.
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