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High pressure hydrogen materials (POM, PEEK, Viton, EPDM) compatibility
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
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8 Replies
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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:
I hope it helps,
Jean-Gabriel
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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
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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-
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.
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I would be very interested in this comparison as I’m currently looking for the same.
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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
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Thanks for your explanation Björn.
I will try sending a PM.
Best regards,
Christiaan -
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.
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