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Formulating RTV Silicone Sealants

SpecialChem / Nov 23, 2005

Silicone polymers display an exceptionally wide range of chemistries and physical properties. These polymers can be low viscosity liquids, crosslinkable elastomers, or hard solids. Adhesives and sealants represent only one major class of commercial silicone products. These versatile materials were introduced approximately 30 years ago and many of the original formulations are still utilized. Applications for silicone sealants are extremely broad. Markets include construction, automotive, assembly, maintenance, electrical/electronic, aerospace, and consumer products. Silicone sealants often compete with other materials such as polyurethanes, polysulfides, and acrylics. However, in applications requiring long-term durability to harsh environments, silicones are generally specified. One of the most popular subclasses of silicone sealants is the RTV (room temperature vulcanizing) product.These crosslinking reactions occur at room temperature, hence the term "RTV", and they are generally moisture-curing reactions.

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