This is a seal obtained by extrusion of pure non-sintered PTFE, to which special lubricants and graphite have been added. Soft and easily adapted to any seal housing, this seal is chemically inert and withstands the aggression of all chemical products and solvents, with the exception of alkali materials. It does not harden within the limit of 260°C, thus preventing scoring of the shaft; it is resistant to corrosive agents.