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Polyurethane and silicone sealants are widely specified for installations with porous substrates such as some stones. However, when a sealant is used against such surfaces, there is a potential for a lack of adequate adhesion, or staining of the stone by misapplication or migration of the liquid components of the sealant system, such as primers or plasticizers in the formulation. Some varieties of marble in particular have been reported to be susceptible to staining and discoloration over time from sealants. Application of new sealant over existing sealants is also of great concern for remedial applications. Determining the level of substrate preparation necessary to achieve adequate bond is critical to the success of the remedial construction project.
This paper discusses the development and results of a test program conducted to determine the relative performance of sealants installed on a white marble substrate. The tests performed included wet adhesion tests, accelerated weathering studies, and staining due to plasticizer migration.
Sealants, Marble, Testing, Adhesion, Accelerated Weathering, Staining
Senior Engineer, Washington D.C. office of Wiss, Janney Elstner Associates, Inc., Fairfax, VA
Senior Chemist, Erlin Hime Associates Division of Wiss, Janney, Elstner Associates, Inc., Northbrook, IL