SEDL / STP / STP1271-EB / STP16055S

Effects of Weatherproofing Sealants on Building Aesthetics — Part II

O'Neil, VK
Technical Service and Development Chemist and Global Technology Manager, Sealants Science and Technology, Dow Corning Corporation, Midland, MI

Wolf, AT
Technical Service and Development Chemist and Global Technology Manager, Sealants Science and Technology, Dow Corning Corporation, Midland, MI

Pages: 28    Published: Jan 1996

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Abstract

The paper describes several sealant related phenomena which can contribute to building aesthetic problems. These include sealant dirt pick-up, fluid streaking on a substrate (staining), and fluid migration into porous substrates. The paper postulates mechanisms for these phenomena and suggests appropriate test methods to assess them. The paper also presents long-term weathering results obtained on 12 weatherproofing sealants selected from the following generic types: plasticized silicones, unplasticized silicones, unplasticized surface-modified silicones, plasticized polyurethanes, unplasticized polyurethanes and plasticized silicon modified polyethers. In order to address the influence of local environment and exposure conditions, sealants are exposed at a rural site in Georgia and an industrial site in Michigan.