An accelerated humidity test utilizing a combination of high temperature and high humidity has been used to determine the ability of urethane and polyacrylate elastomers to withstand humid environments. A wide variation was found in the hydrolytic stability of the materials tested, which would not have been dis closed by the usual short term low temperature humidity test. The degradation has also been found to occur at moderate humidities as well, although the quantitative relationships of degradation rate versus relative humidity level has not as yet been accurately defined.
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