HIGH STRENGTH GLASS FIBERS DEVELOPMENT PROGRAM
GENERAL ELECTRIC CO CINCINNATI OH
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The influence of moisture on the effective strength of E-glass fibers, both as single monofilaments and when incorporated with epoxy resin into filament-wound ring structures, was investigated. Humidity in the atmosphere surrounding the fiber was controlled during various periods in its history. Split ring tensile tests on the composites showed a definite ad vantage for the maintenance of dry surroundings throughout all processing steps. Work with single bare fibers of E-glass served to verify the importance of this stress corrosive reaction. By conducting tensile tests at liquid nitrogen temperature -196 C, the reaction rate was reduced essentially to zero with a resulting change in average fiber strength from 507,000 psi at room temperature to 814,000 psi at -196 C. At the low temperature, 25 of the fibers exceeded 900,000 psi and values as high as 974,000 psi were recorded.
- Refractory Fibers