Polytetrafluoroethylene composition, forming product, conductive pipe, heat conduction film, and substrate CCL

A method for producing a polytetrafluoroethylene composition, comprising

• mixing a polytetrafluoroethylene resin and a filler using an airflow mixer which is a pulse-type airflow mixer configured to provide a polytetrafluoroethylene composition containing the filler uniformly covering surfaces of particles of the polytetrafluoroethylene resin,
• wherein in the mixing, a temperature of a mixing tank of the airflow mixer is controlled to be within a range of 5° C. or higher and 30° C. or lower,
• wherein the mixing includes feeding air to the mixing tank through a plurality of nozzles, the mixing tank comprising therein the polytetrafluoroethylene resin and the filler, and
• wherein the plurality of nozzles are vertically oriented relative to the mixing tank.