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ECTFE formula.jpg
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  • InChI=1S/C2F4.C2H4/c3-1(4)2(5)6;1-2/h;1-2H2 checkY
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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ECTFE (ethylenechlorotrifluoroethylene) is a copolymer of ethylene and chlorotrifluoroethylene. It is a semi-crystalline fluoropolymer (a partially fluorinated polymer) designed to provide chemical resistance in heavy-duty corrosion applications.

Physical and chemical properties[edit]

ECTFE is resistant to acids at high concentrations and temperatures, caustic media, oxidizing agents and many solvents. It has similar chemical resistance to PTFE.[1] A chemical resistance table,[2] based on immersion tests, has explored this further. Permeation of large molecules is slow in fluoropolymers and thus is not relevant in the final application. Small molecules, however, may permeate through the polymer matrix at a relevant time. In lining or coating applications, the permeation of certain small molecules determines the lifetime of anti-corrosion protection. H2O, O2, Cl2, H2S, HCl, HF, HBr, N2, H2, CH3OH, etc. are relatively mobile in a polymer matrix and lead to measurable effects.[3][4] Permeation resistance is significant for lining and coating applications, because permeating species may attack underlying mechanical layers, such as fiber reinforced plastic or steel. This high permeation resistance to small molecules is a consequence of the free volume occupied by the chlorine atom in the polymer chain.

ECTFE has a continuous usage temperature range between typically –76 °C and +150 °C (–105F to +300F). It has good impact resistance and Young's modulus in the range of 1700 MPa,[5] allowing for self-standing items and pressure piping systems. ECTFE maintains high impact strength in cryogenic applications.[6]

In terms of fire resistance, ECTFE shows a limiting oxygen index of 52%.[7] This is between the fully fluorinated polymers PTFE, PFA and FEP with a limiting oxygen index of 95% and other partially fluorinated polymers like PVDF with a limiting oxygen index of 44% and ETFE with a limiting oxygen index of 30%.

ECTFE is an electrical insulator, with high resistivity and a low dielectric constant as well as a low dissipation factor, allowing its use for wire and cable primary and secondary jacketing. Similar to other fluoropolymers, ECTFE has good UV resistance, in particular against UV-A and UV-B. ECTFE films[8] can be transparent.[9]

ECTFE is welded in a variety of methods, including:


ECTFE is applied in several ways:

ECTFE powder is most commonly used in electrostatic powder coating.[11] ECTFE powder coatings have a typical thickness of 0,8 mm but can be applied up to 2 mm with a special grade for high build up.[12][13]

Extrusion of ECTFE fabric-backed sheets and subsequent fabrication to vessels, pipes or valves is used in the chemical industry.[14][15][16] Thick sheets are compression molded and can go up to 50 mm in thickness. They are used in the semiconductor industry for wet benches or machining other parts.

The most common application of ECTFE is in the field of corrosion protection. ECTFE is used for corrosion protection in industries including:

ECTFE has been widely used in the semiconductor industry, for wet tool and tubing systems for lithographic chemicals.[25][26]

ECTFE is also used in the pharmaceutical industry.[27][28][29]

Moreover, ECTFE is used for primary and secondary jacketing in specialty cables like data cables or self-regulating heating cables, applications where good fire resistance and electrical properties are key properties. ECTFE is also used for braiding in that field.[30][31]

ECTFE in the form of a monofilament fiber is used in flue gas treatment and in certain chemical processes.

Unlike PTFE, ECTFE can be crimped[citation needed] which allows its production in the form of nonwoven fibers with high surface area and porosity.[32] Even though such material has low chemical reactivity, ECTFE in general has somewhat lower chemical resistance[citation needed] comparing to PTFE.

Halar films are used in the aircraft industry as well as for photovoltaic front and back sheets.

ECTFE is used for manufacturing gaskets to store liquid oxygen and other propellants for aerospace applications.[33]

See also[edit]

  • bs4994 ECTFE as a thermoplastic lining for dual laminate chemical process plant equipment's
  • RTP-1 ECTFE as a thermoplastic lining for dual laminate ASME stamped vessels.


  1. ^ "Halar ECTFE - Precision Fiber Engineering - Atkins & Pearce". Atkins & Pearce - Our Spirit Drives Discovery!.
  2. ^ "Archived copy" (PDF). Archived from the original (PDF) on 2013-12-12. Retrieved 2013-12-09.{{cite web}}: CS1 maint: archived copy as title (link)
  3. ^ C.M. Hansen, Progr. Org. Coat., 42, 167 (2001)
  4. ^ Polymer Handbook, J. Brandrup (Editor), E. H. Immergut (Editor), E. A. Grulke (Editor), Publication Date: May 29, 2003 ISBN 978-0471479369
  5. ^ SOLVAY S.A. "Halar® ECTFE for Coatings".
  6. ^ Jiri Drobny (2006). Fluoroplastics. iSmithers Rapra Publishing. p. 39. ISBN 978-1-84735-007-7.
  7. ^ technical datasheet of a typical ECTFE grade
  8. ^ SOLVAY S.A. "Ajedium™ Films".
  9. ^ "Halar film datasheet" (PDF).
  10. ^ a b
  11. ^ Halar, ECTFE, coating applied by Kersten Kunststof(f)coating. YouTube. 15 May 2011. Archived from the original on 2021-12-22.
  12. ^ "Oberflächenbeschichtungen – Kunststoffbeschichtungen – Korrosionsschutz und Antihaft :: Hüni GmbH & Co. KG".
  13. ^ "Adelhelm Kunststoffbeschichtungen, Lohnbeschichter für Antihaft, Antihaftung, Korrosionsschutz, Chemikalienschutz, adcoat, PFA, FEP, PTFE, Medizintechnik". Archived from the original on 2014-02-08. Retrieved 2013-12-13.
  14. ^ "ECTFE Semi Finished Products : Product Catalogue - AGRU".
  15. ^ Simona. "SIMONA, Category: Product group E-CTFE".
  16. ^ "corrosion resistant, chemical resistant, physical, mechanical and flame resistant, fluoroplastic, fire safe systems, impact strength, color consistency, high purity - Quadrant". Archived from the original on 2013-12-13. Retrieved 2013-12-13.
  17. ^ "Lining Limits Corrosive Reach of Bleach". 22 November 2008.
  18. ^ "Archived copy". Archived from the original on 2012-05-28. Retrieved 2013-12-13.{{cite web}}: CS1 maint: archived copy as title (link)
  19. ^ "Case study H2SO4 and solvent" (PDF). 5 May 2015.
  20. ^ kommunikation + design. "SIMONA City". Archived from the original on 2014-07-15. Retrieved 2013-12-11.
  21. ^ "Concrete protected by AGRU SureGrip - AGRU".
  22. ^ "Admor Composites Oy". Archived from the original on 2013-12-12. Retrieved 2013-12-09.
  23. ^ "Case Studies".
  24. ^ Elredgeco Halar lined transport tanks
  25. ^ "ECTFE Industrial Piping System : Product Catalogue - AGRU".
  26. ^ "Archived copy" (PDF). Archived from the original (PDF) on 2013-12-13. Retrieved 2013-12-13.{{cite web}}: CS1 maint: archived copy as title (link)
  27. ^ "Complete ECTFE piping system in vaccine production - AGRU". Archived from the original on 2014-01-24. Retrieved 2013-12-11.
  28. ^ "Novartis case story" (PDF).
  29. ^ "Plume suppression, reactor off gases, thermal oxidation, chemical and pharmaceutical case studies".
  30. ^ "Braid Halar (HT) Self Extinguishing 11mm ethylene chlorotriflouroethylene (ECTFE) copolymer monofilament, Nominal 1/8 (3.17mm), Expands 3/32-1/4 (2.38-6.35mm), Colour Black with White tracer DTL Connectors". Archived from the original on 2013-12-14. Retrieved 2013-12-10.
  31. ^ "Techflex - Halar® Plenum Rated Expandable Sleeving".
  32. ^ Ursino, C.; Ounifi, I.; Di Nicolò, E.; Cheng, X. Q.; Shao, L.; Zhang, Y.; Drioli, E.; Criscuoli, A.; Figoli, A. (2021-03-15). "Development of non-woven fabric-based ECTFE membranes for direct contact membrane distillation application". Desalination. 500: 114879. doi:10.1016/j.desal.2020.114879. ISSN 0011-9164. S2CID 230599516.
  33. ^ "Understanding ECTFE Industrial Coatings". Toefco. 2014-10-01. Retrieved 2022-07-11.