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This research is about the construction urethane type sealant.We tried to make new method for evaluating test method more faster and precise than former ones.The limitation of the outdoor exposure method is especially long-term test period,changeable weather and so forth on.We tried to make faster than by using specialized test zig which is best fit for sealant materials.This is focused about the failure material itself.This research is not concentrated about the adhesive or cohesive failure.The main point is about the degradation on the material surface by complex stress.