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Will Nomaco Backer rod absorb moisture?

April 26, 2017backer moisture nomaco Rod

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Will Nomaco Backer rod absorb moisture?

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All backer rods absorb moisture. ASTM C1083 is referred in ASTM D5249 as the test method for water absorption of the Backer materials used in pavement joint reservoirs. ASTM D 5249 Physical Property Requirement Table 1 limits water absorption to .5% by volume, max. ASTM C 1330 Standard Specification for Cylindrical Sealant Backing for Use with Cold Liquid- Applied Sealants; Table 1, Sealant Backer Properties reference ASTM C 1016 procedure B as test method. Various type backer materials have various water absorption levels and meet ASTM C 1330. Users are advised to get Nomaco or sealant manufacturers’ approval for project specific combinations of backer rod and sealant.