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These selection and qualification procedures are expensive and time-consuming. To eliminate the testing of unsuitable elastomers, short-term laboratory tests are used to give a guide to the long-term performance of the compound.
Test methods that are available to elastomer suppliers without the need for expensive equipment present a significant advantage. Traditional hardness, tensile and tear-strength data are good for QC work but do not predict seal-system performance.
The CS test, with a 24-hour unconstrained reheat cycle, is suggested as a test that does come close to predicting performance. It also offers good repeatability as a quality test. This method is particularly interesting as it does correlate well with the more complicated stress-relaxation test methods.
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