Welcome! Let’s grow the hydrogen economy together. Let’s grow the hydrogen community! Questions & Answers High pressure hydrogen materials (POM, PEEK, Viton, EPDM) compatibility

  • High pressure hydrogen materials (POM, PEEK, Viton, EPDM) compatibility

    Posted by Enric Palau on November 2, 2022 at 10:41

    Hello!
    Does anyone have experience with the compatibility of materials with high-pressure hydrogen up to 800 bar?

    For example valve seats in POM (Acetal or Polyacetal). I cannot find any literature that mentions research on this field.

    For valve seats in Peek, it’s wildly used. BUT some literature mentions special reinforced PEEK for hydrogen although I haven’t seen it in the regular PEEK suppliers.

    For gaskets, some literature recommends FKM-AED (Anti-Explosive Decompression) and some other EPDM,

    has anyone experience in those materials compatibility or can point me to some good literature?

    Have a good day!

    Enric

    Björn Lüssow replied 9 months, 3 weeks ago 8 Members · 10 Replies
  • 10 Replies
  • Jean-Gabriel Stocker

    Member
    November 24, 2022 at 12:59

    Hello Enric,

    The Vespel(r) from DuPont(tm), a polyimide (PI) material, can bring solutions for applications in high pressure hydrogen environment.

    You can find more details in the brochure at the following link:

    https://www.dupont.com/content/dam/dupont/amer/us/en/vespel/public/documents/en/DuPont%E2%84%A2%20Vespel%C2%AE%20Parts%20for%20Hydrogen%20Energy.pdf

    I hope it helps,

    Jean-Gabriel

  • Anil Can Turkmen

    Member
    December 6, 2022 at 22:32

    As a gasket material, Viton is a very useful material. I think its most important feature is its ability to fully adhere to the surface, even almost to the surface.

    I think it can be used as a cell seal, especially at high pressure.

    Anil

  • Christiaan van der Blij

    Member
    January 17, 2023 at 05:58

    Good morning,

    I’ve checked this with the respective product manager and another alternative would be Etrox I, a polyimide material.

    There’s a flyer: https://www.roechling.com/fileadmin/downloads/Roechling_Industrial_Brochures_EN_EtroX/Flyer-Industrial-EtroXICM-EN.PDF

    and a TDS available here: https://www.roechling.com/industrial/materials/thermoplastics/detail/etrox-i-cm-6121

    Hope this helps anyone.

    Best regards,
    Christiaan

    • Christiaan van der Blij

      Member
      January 23, 2023 at 07:03

      I wanted to post a screenshot of a technical comparison of values of this material and PEEK, PAI, TPI and Vespel, but I can’t upload any image files, sorry. Send me a pm for the technical comparative overview of these materials.

      • Larissa Lehmann

        Member
        January 30, 2023 at 09:47

        I would be very interested in this comparison as I’m currently looking for the same.

  • Björn Lüssow

    Administrator
    January 25, 2023 at 17:49

    Hello, dear both. We have not yet enabled that feature to upload pictures (because we fear – we might be wrong!) that it will end up in marketing activities. I am nevertheless willing to try it. You can send PM to other members if you first send a connection request (that is accepted). I hope that helps. Kind regards Bjoern

  • Christiaan van der Blij

    Member
    January 30, 2023 at 07:09

    Thanks for your explanation Björn.

    I will try sending a PM.

    Best regards,
    Christiaan

  • Ace Fujiwara

    Member
    August 28, 2023 at 08:33

    At 800 bar pressure, none of the materials will last considering that you are exploring the use of a value seat.

    A better option is to do surface treatment of the valve substrate (steel) with a coating like AL2O3.

    This can be done via thermal or plasma spray method.

    You will need to check the hydrogen impurity tolerance range so that the optimal coating composition can be selected.

  • Krupal Talsaniya

    Administrator
    October 5, 2023 at 13:43

    Dear @RPenn , we just checked. The picture upload should be possible now.

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