vapor barrier transmission rate

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vapor barrier transmission rate
i am looking for a reference either by an organization or a maunfacturer that states what the vapor transmission rate (perms) is for a 6 mil reinforced polyethylene sheet. the only one i have been able to find is for unreinforced in astm and i need to know if the reinforcing makes a difference in vapor transmission rate.
thanks
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a good reference is a book called building science for a cold climate published by national research council of canada.  the si perm value for 6 mil polyethylene is 0.0522 (dry cup) perms in ng/(pa*s*m)
jw