Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Predicting Material In-Service Performance using the NIST SPHERE



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


Selecting a polymeric material for an application exposed to outdoor weathering is a challenging task. The proper selection requires knowledge of the behavior of the material, which is a complex mixture involving the integration of rheology, reliability based methodology, analytical chemistry, mechanical engineering, statistics, standards development, and economics. The research discussed here involves a precisely controlled temperature, humidity, Ultra-Violet radiation, and applied strain device to generate controlled exposure and characterization of the changes due to exposure in model elastomers and coatings. The focus of this paper will be on the effect of applied strain on the time dependant modulus change of these sealants.
Proceedings Title
Proceedings of the 4th European Weathering Symposium
Conference Dates
September 16-18, 2009
Conference Location
Conference Title
4th European Weathering Symposium


Sealant, modulus


White, C. , Hunston, D. and Tan, K. (2009), Predicting Material In-Service Performance using the NIST SPHERE, Proceedings of the 4th European Weathering Symposium, Budapest, -1 (Accessed June 14, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created June 17, 2009, Updated February 19, 2017