| 摘要 |
<p>Use as sealing and antiseizure agents of pastes comprising at least: A) 35-70% by weight of polytetrafluoroethylene irradiated with gamma rays and/or electron beam having molecular weight between 100,000 and 700,000, with sizes of the powder particles from 2 to 7 micron. B) 30-65% by weight of one or more perfluoropolyethers having viscosity comprised between 20 and 2000 cSt at 20 DEG C and comprising in the polymeric chain fluorooxyalkylenic units selected from the following: <CHEM> optionally (CF2CF2O); wherein X1 is -(CF2)nCF3 and n = 0,1,2,3,4, said units being randomly distributed in the polymeric chain.</p> |
