| abstract |
Powder comprising low molecular weight polytetrafluoroethylene (PTFE) having a melt viscosity of 1 x 10<sup>2</sup>to 7 x 10<sup>5</sup>Pa.s at 380°C, having an average particle size of 1.0-50 µm, having a specific surface area of 0.5-20 m<sup>2</sup>/g and containing ≥ 30 carboxyl groups at ends of the molecule chain per 10<sup>6</sup>carbon atoms in the main chain, the powder having a total content of C<sub>8-14</sub>-perfluorocarboxylic acids and salts thereof of less than 25 ppb. |