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Diffusion rate of methanol though polypropylene sheet

Diffusion rate of methanol though polypropylene sheet

Diffusion rate of methanol though polypropylene sheet

(OP)
I'm trying to find out the transfer rate of methanol through a ~1mm sheet of Polypropylene.  Can any one help?

I've done a fairly extensive search on the web and have good data for HDPE which is a reasonable match I beleive but its PP data that I specifically require.

Thanks for your help

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