ASTM B 743 [5] calls for certain minimum cleanliness levels for refrigeration or air conditioning grades of copper tube. Typically, the inner tube surface shall be sufficiently clean so that when the ID is washed with a suitable solvent (redistilled chloroform or trichloroethylene) the remaining residue after evaporation of the solvent shall be less than g/ft2 ( g/m2) of the ...
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