--- title: Gelbo Flex Durability Test (Foil) description: Composite foil is flexed at specified number of cycles and then evaluated via dye testing to determine pinhole count. Test method is used for ranking flexible materials. 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Composite foil is flexed at a specified number of cycles and then evaluated via dye testing to determine pinhole count. The test method is used for ranking flexible materials. Please contact Oliver below for more information or to speak with a technical expert. 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