Sealant Standard

         A new ASTM International standard outlines a way to quantitatively determine the extent and causes of cracking in a building sealant.  The new standard, C1851, was developed by ASTM International’s Committee on Building Seals and Sealants, C24.  The new standard stemmed from the idea that sealant cracks contribute to tensile modulus, or stiffness, change but not to compression.  After measuring both, using a standard for measuring time-dependent modulus of sealants, C1735, it is then possible to use the new standard to see how much of the change is due to chemical changes in the sealant and how much is physical cracking.  Manufacturers could use the new standard to determine and ultimately enhance durability.  Testing laboratories and regulatory bodies could also find it useful. 

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