Measuring TAN in aviaton hydraulic fluid (phosphate esters)

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We use ASTM D-664 and are getting results that does not complie with the recommended method ASTM D-974 for Phosphate Ester hydraulic fluid (Skydrol/Hyjet type 4 fluid).

Does anyone have any experience with using D664 on theese fluids?

Edit Des 05:
Found out that ASATM D-974 will give the correct result (but it is possible to modify the 664 method to a higher pH).

10/18/055:41 AM

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