Performance of polyurethane sealants on a strain-cycling exposure rack

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Journal titleMateriaux et constructions. Materials and Structures
Pages6063; # of pages: 4
Subjectplastic sealants; weathering; strain; urethane-based sealants; building joint simulation; weathering; multi-component sealants; aluminium priming; joint movement; Buildings; mastic plastique; action des intemperies; deformation
AbstractSpecimens of eight urethane-based sealants have been exposed on a rack that closely reproduces the width changes occurring in a building joint. Specimens that could not move were concurrently subjected to only one weathering. After one year, three of the multi-component sealants exhibited good to excellent performance. One of the latter confirmed the results of a prior exposure, but with the other a repeat test in the second year revealed a much higher failure rate with a new batch. The remaining two multi-component and all three single-component urethanes failed in a few months, although priming the aluminum substrate delayed failure of one single-component sealant to the end of the year. The predominant effect of joint movement on sealant performance is shown by the lack of failure of any specimens that could not move. Recommendations are made on test conditions that provide the best evaluation.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number30315
NPARC number20374954
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Record identifier372a6cd9-c71a-4bd0-9b68-86aa1c68b91b
Record created2012-07-23
Record modified2016-05-09
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