Research on Sealant at the National Institute of Standards and Technology: Past and Present
Christopher C. White
The standard test method for evaluating sealant performance is the ASTM C719, which resulted from the pioneering work of NIST researcher Authur Hockman. This test method is a threshold or torure test. This presentation will detail efforts to move away from the use of threshold tests towards a reliability-based method for predicting the service life of sealant. The first task in this approach will be the demonstration that data from both monitored outdoor exposure and controlled indoor exposure are predicting the same service life. These efforts will test both adhesive and cohesive falure of the sealant formulations. In both the indoor and outdoor exposures the sealant will be exposed to cyclically interrelated deformation, humidity, UV flux, and temperature.
24th Annual Meeting of the Society of Adhesion
February 25-March 1, 2001
Society of Adhesion
ASTMC719, durability, NIST, reliability-based methodology, sealant, service life prediction