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A composition based on PTFE, in the form of a paste, obtained by mixing together a PTFE powder, with mineral fillers, selected from PbO, Pb powder, aluiminum silicates, graphite, MoS2, a resin of high adhesive properties, in particular an epxoy resin; solvents with good wetting properties for the so

A composition based on PTFE, in the form of a paste, obtained by mixing together a PTFE powder, with mineral fillers, selected from PbO, Pb powder, aluiminum silicates, graphite, MoS2, a resin of high adhesive properties, in particular an epxoy resin; solvents with good wetting properties for the solid ingredients and vaseline to impart to the paste the suitable degree of viscosity, said paste being applicable in a very thin layer to porous bronze bearings or supports, and suited for forming a self-lubricating layer, after a thermal treatment of the said PTFE on said bearings.

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A PTFE-based composition suited for forming a covering layer with self-lubricating properties, to be applied on a porous bronze substrate, formed following a thermal sintering treatment, characterized in that it consists of the following ingredients, indicated in parts-by-weight per 100 parts of mix

A PTFE-based composition suited for forming a covering layer with self-lubricating properties, to be applied on a porous bronze substrate, formed following a thermal sintering treatment, characterized in that it consists of the following ingredients, indicated in parts-by-weight per 100 parts of mixture: (a) PTFE in the form of a dry powder, with a granulometric distribution of between 1m8m300,000 to 500,000 and a melt-flow index of 0.1-0.3, measured at 350°C. according to ASTM D-1238, in a quantity between 30 to 60 parts by weight (p.b.w.); (b) inorganic component selected from: MoS2, PbO, powdery metal Pb-graphite and aluminum silicates with a granulometry of from 4 to 5 microns, in a quantity of between 10-25 parts by weight; (c) an adhesive resin, selected from epoxy-, silicon-, and polyamidic resins, in a quantity between 2 and 8 p.b.w.; (d) a chlorinated hydrocarbon solvent with a good wetting power for PTFE and the inorganic component having a boiling point between 50°and 150°C., in a quantity between 10 and 20 p.b.w.; (e) alliphatic paraffinic hydrocarbon having a viscosity between 10 and 20 centistokes at 40°C. in a quantity between 10 and 50 p.b.w.;