is there zero Helium gas permeability membrane materials ?

Dear All ,
Is there zero Helium gas permeability membrane materials ?
Thanks in advance
WMGS

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snipped-for-privacy@polyu.edu.hk (WMGS) wrote:

Use these search terms in google: membrane helium impermeable. Here are some of the things you'll find:
http://www.ac.by/activities/anbfun95/r95ofmi.html
http://www.netl.doe.gov/products/r&d/techpapers/Old (before%208-26-02)/99_p_073.pdf
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