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Effect of Strain on the Modulus of Sealants Exposed to the Outdoors



Christopher C. White, Donald L. Hunston, Kar T. Tan


The effects of applied strain on sealants exposed to outdoor weathering were examined for two sealant formulations, sealants A and C. Both static and dynamic strain was applied to the sealants during the summer in a Gaithersburg, MD-outdoor location. Both sealants exhibited a reversible change in equilibrium distance. Stress relaxation studies on all samples revealed that, for sealant A, two mechanisms affected modulus change; exposure without applied strain increased the modulus while additionally applied strain decreased the modulus. Only one mechanism that decreased the modulus was found for sealant C. A 7% dynamic strain and a 25% static strain were observed to produce equivalent modulus changes in both systems.
Journal of ASTM International


Sealant, Strain, Modulus, Outdoor Weathering, Characterization


White, C. , Hunston, D. and Tan, K. (2009), Effect of Strain on the Modulus of Sealants Exposed to the Outdoors, Journal of ASTM International (Accessed April 14, 2024)
Created March 11, 2009, Updated February 19, 2017