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The paper compares the results of different lab tests, suggested during the development of an ISO standard on sealant durability, with those obtained from outdoor weathering under mechanical strain. The comparison shows that the 70 C compression test, as included in ASTM C-719, is helpful in identifying sealants, which fail due to high compression set. The heat compression test, however, does not rule out sealants that tend to post-cure or embrittle upon ageing. The best correlation between lab tests and outdoor weathering is obtained, if the sealants are allowed to fully cure prior to lab testing.
ISO TC59/SC8, durability test method, mechanical cycling, outdoor ageing
Technical Service & Development Section Manager, Dow Corning S.A., Parc Industriel, Seneffe,