The main purpose of the present investigation was to characterize the behavior ofS‐glass fibers at quasistatic strain rates. The experimental results presented herein, representing over 1600 individual tests, are a first step in the statistical characterization of fiber properties. It has been established that fiber strength decreases with increasing strain rate. Moreover, the experimental results demonstrate that Weibull distribution can adequately represent fiber strength distribution for quasistatic strain rates. For the type of glass tested, strength was observed to be maximum at or near room temperature (+75°F). The strength dependence on strain rate is greatest at room temperature. At higher or lower temperatures the dependence on strain‐rate is not so marked. Tests were also performed to determine the elastic modulus at various temperatures and strain rates. The elastic modulus increases with both an increase in strain rate and a decrease in temperature.