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Thread: A easy/difficult question?
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26-05-2006, 06:48 AM #1
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A easy/difficult question?
I have a question now,easy?difficult?
What is the standard of refrigerants?That is what is the requirements for the R290,R1270,r744 etc. Such as purity,concertration?
I don't find the industrial standards!
rgds
sagittarius
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