Trelleborg Sealing Solutions Type TRC are metal cased radial lip seals. This type is not recommended for use in heavily polluted environments. As the static sealing between housing and metallic shell is limited, low viscosity media can "creep". Better performance can be achieved with Epoxy-based resin O.D. coating. This special treatment is on request.--Trelleborg Sealing Solutions Type TRC are metal cased radial lip seals. This type is not recommended for use in heavily polluted environments.