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How can we measure melt flow index if we have different relative humidity maybe one is 10% and another  is 90%. Do we have some instructions or some standard how to measure this kind of materials?

Thank  you very much for you answer.
Best regards, Janez

Hi Janez:

Thanks for your question.  Do you mean the RH in the laboratory or the moisture content of the materials being tested?  Generally, if you dry the material before processing it you also have to dry it before testing.  If you have questions on condition the sample, please refer to ASTM D618.  Hope this helps - Harry