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PET-SL (Polyethylene terephthalate filled polytetrafluoroethylene)

Polyethylene terephthalate filled polytetrafluoroethylene is a modified, semi-crystalline polyester, usually known with the acronym PET – SL (Solid Lubricant). Main properties of this material are mostly comparable to PET ones, in addition a better wear resistance and a lower friction coefficient are achieved, with linked better performance in sliding properties.


Main properties and characteristics of PET-SL.

PET-SL keeps its dimensions very well, even under the changing influence of weather and climate conditions, thanks to its incredibly low water and moisture absorption.

The main characteristics of PET-SL is its unquestionable wear resistance. Thanks to PTFE (Teflon) filling, its resistance is highly increased. In fact this material is most suitable for sliding applications, with remarkable benefits against slip-stick effect, a very common case in construction equipment industry.

PET-SL assures a good service between 0 and +110°C, although that you must pay attention to hydrolysis, which begins at +60°C.

Another strength point achieved by PTFE filling, is the reduced crystallinity of PET; so it becomes less fragile and less subject to be chipped.


Chemical resistance.

Polyethylene terephthalate filled PTFE is resistant to many chemical, such as: aliphatic and aromatic carbon hydrogen, ether, esther and aldheide as well as to oils and greases. Inorganic acids, caustic solutions, basis, hot water and steam could attack it.


Miscellaneous information.

PET-SL results suitable to come into contact to foodstuff and it complies EC 1935/2004, EC 2023/2006, EU 10/2011 and FDA.


PET-SL: most famous brand names.

PET-SL is usually available in sheets and rods, with a short range of dimensions. Tubes are usually available upon requests and with minimum lot sizes.

  • Zellamid 1400 T;
  • Sustadur GLD;
  • Ertalyte TX.


PET-SL in few words.

Special properties:

  • Great mechanical resistance;
  • Good chemical resistance;
  • Excellent wear resistance;
  • Excellent sliding properties;
  • Anti slip-stick effect.

Used in:

  • Food processing;
  • Pharma;
  • Steel industry;
  • Material handling.


  • Bushing;
  • Bearings;
  • Sliding components;
  • Valves.