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RTV133 is a firm favorite in the aerospace, appliance and transportation industries. This black silicone rubber sealant sealant utilizes a moisture vapor curing system. Curing is slow but the final results are tough and resilient. RTV133 only flows under pressure and is therefore suitable for use on horizontal, vertical and overhead surfaces. It offers excellent resistance to moisture and most chemicals. It offers excellent electrical insulation and it is well known for its low flammability.