| Summary |
In order to evaluate the long-term stain resistance of membrane materials， ten-year-outdoor exposure tests were carried out for several kinds of surface treatment on the polyvinyl chloride (PVC) coatings of membrane materials. The test results showed that the specimens treated with fluorocarbon-resin clearly effected stain resistance for ten years and their surface morphological changes were not observed remarkably. On the other hand， the specimens treated with polymethyl methacrylate and that of without surface treatment bad the worst stain resistance after a three-to-five-year-exposure-period， however， dirts were removed after a ten-year-exposure-period because the plasticizer contained in PVC migrated and dirts were released due to the deterioration and exfoliation of PVC.
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