permeability of elastomers

[Roy Tucker]

Posted to CCD-world:
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Dear Fellow Vacuum Enthusiasts,
     I have managed to find some numbers regarding diffusion rates of
various gases through various elastomers from some Parker Seals
publications but it's not terribly complete. Can someone recommend a good
source of such data, especially with regard to Butyl and Fluorocarbon
elastomers such as one might use for vacuum sealing applications. Thanks!
							- Roy Tucker, NOAO


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