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I have a problem of measuring Methane migration into and out of a sample of insulation foam. The material is closed cell so the rate

I have a problem of measuring Methane migration into and out of a sample of insulation foam. The material is closed cell so the rate of absorption and desorption is very low. If we use Helium as a model gas in a test like ASTM D1434 can we calculate the corresponding rate with Methane? Problem with Methane is that it is seen as to dangerous by most labs..

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