Of all the known plastics, PTFE has some remarkable properties: it will not attacked by corrosive acids, even if they were hot; it did not dissolve in solvents; PTFE materials also are extremely stable and nonflammable; clean, dry, non-oily and non-staining. The material is biologically inert and does not support biological growth (that is, it is non-pyrogenic). PTFE offer an extremely low static coefficient of friction, which stems from the extremely low intermolecular forces in the PTFE molecule itself.