Polymeric Systems Inc. recently introduced Sili-Thane 803, an MS polymer-based sealant that combines the benefits of silicone with the benefits of polyurethane. Sili-Thane 803 was specifically designed for use in a wide range of interior and exterior uses, such as sealing joints with varying coefficients of expansion.
It cures to a mediummodulus rubber with excellent adhesion and weathering abilities, and it is less likely to cause staining or corrosion than urethane or silicone sealants. Sili-Thane 803 adheres to a wide range of substrates, exhibits exceptional adhesion to damp or dry surfaces and has good underwater adhesion to nonporous surfaces. It will not foam or bubble when exposed to moist substrates or high humidity conditions during cure.
The material is gunnable at low temperatures, has virtually no odor, and can be painted. Sili-Thane 803 skins over in less than 30 minutes. It is solvent- and isocyanate-free with a very low VOC content. Its standard colors are White, Gray, Limestone and Black.
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