FIELD: chemistry.
SUBSTANCE: cleaner concentrate is described for a vehicle heat transfer system comprising an aluminum component, manufactured by brazing in a protective atmosphere containing more than 15 wt % of freezing temperature reduction means, 8 to 35 wt % of oxalic acid and an azole compound wherein the wt % is based on the total weight of the cleaner concentrate.
EFFECT: concentrate is a homogeneous solution.
17 cl, 6 tbl, 32 ex
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