Permeation rates in theory  

Thread by sheridelle on 24 Mar 2009 at 16:30:36 
Hi everyone,

Being a newbie on permeation, I´d need some help to understand some theorical subtilities about it.

For my project, which is concerning an EPDM hose filled with air under a temperature that can reach 70°C, I would like to know how many volum of air i´m loosing every day.

I would like first to determinate this volum in theory. But the facts are, that I don´t know how to proceed !

In the different books that i read on the subject, I can find a permeations´s rate for EPDM rubber under 65,6°C of : 3299 / (

But all the equations (Fick´s equation) that i found are related to practical tests.

Would it be possible, with this value, to estimate the volum of air which is going out of my hose, knowing the volum of the hose, its thickness, the pressure in it, the pressure outside it, the temperatur ??
or is there something that i´ve missed ??

Thank you in advance for your answers,

    Comment by Composite Analytica on 26 Mar 2009 at 20:49:17  | |responses: 0|
    Dear Sheridelle,

    In case of this specific example, being EPDM rubber with Air as permeant this is very well possible. You may want to contact us for more information and / or similar calculations.

    With kind regards,
    Composite Analytica