Helium gas permeation values for PTFE & TFM  

Posting by Jay Abrahimzadeh on 04 Sep 2008 at 02:23:36.

I have seen comparative numbers by DuPont. Can anyone help me with this, may be helium volume/area/time for a 1&2 mm thick PTFE & TFM material? Thank you in adavance. JA

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    On 09 Sep 2008 at 14:38:08 Composite Analytica posts:
    Hi Jay,

    You can assume that the comparative permeation figures by Du Pont definitely have the correct order of magnitude. However realize that a factor that is very very important with PTFE and TFM in case of diffusion, solubility and permeation calculations is the degree of crystallinity. If you could provide us with the figures you have, we may be able to assist you in a detailed manner. Note that in case of PTFE and TFM, Helium permeation is a good measure for "worst" case mass transfer through the material.

    Composite Analytica
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