1、 FORD LABORATORY TEST METHODAM 152-01Date Action Revisions 2006 03 14 Activated C. Goncalves Printed copies are uncontrolled Copyright 2006, Ford Global Technologies, LLC Page 1 of 2 MINERAL OIL CONTAMINATION OF BRAKE FLUID BY ALCOHOLIC SOLUTION AND COLORIMETRY (RELEASED FOR FSAO) Application This p
2、rocedure describes a method for detecting and estimating mineral oil contaminants above 0.005% in DOT 4 or superDOT4 brake fluids by ethyl alcohol solution and colorimetry. Apparatus Required pH meter Accuracy of +/- 0.06 Glass pH electrode Graduated test tube 100mL Glass buret 50 mL Volumetric flas
3、k 1000mL Colorimeter Photometer accuracy of +/- 0.001A, Wavelength 430nm, 520nm, 570nm and 620nm, precision of +/- 2nm, LED as light source and 10mm sample cell. Materials Required DOT 4 or superDOT4 fluid sample Alcoholic solution Solution 45% v/v ethyl alcohol (99.5%) in deionized water, neutraliz
4、ed to pH 7.0 +/- 0.5 using NaOH 0.1N solution. Volume 1000mL. Note: When preparing alcoholic solution, add ethyl alcohol under deionized water. Blank solution Solution 30% v/v Dot 4 superDOT4 fluid sample free of mineral oil in alcoholic solution. Conditioning and Test Conditions All test values ind
5、icated herein are based on material conditioned in a controlled atmosphere of 23 +/- 2 C and 50 +/- 5% relative humidity for not less than 24h prior to testing and tested under same conditions unless otherwise specified. FORD LABORATORY TEST METHODAM 152-01Printed copies are uncontrolled Copyright 2
6、006, Ford Global Technologies, LLC Page 2 of 2 Procedure 1. Prepare a 100mL sampling solution by adding fluid sample under alcoholic solution previous prepared 2. Let it rest at least 30 minutes 3. Acquire color data for blank solution and record as B 4. Acquire color data for sampling solution and
7、record as S 5. Record color rate as C = S B 6. Use C value to obtain mineral oil concentration (percentage) from plot 01 bellow 7. For the first time, repeat at least 20 times to get standard deviation (SD) 01020304050607080901000.000 0.005 0.010 0.015 0.020 0.025Mineral oli percentage (v/v)Color ra
8、tePlot 01- Color rate versus mineral oil percentage from power steering fluid WSA-M2C195-A used in FSAO. Evaluation The acceptance criteria is C 90, given for 0.025% of mineral oil in DOT4 or SuperDOT4 brake fluids. Report C +/- SD. Chemicals, materials, parts, and equipments referenced in this document must be used and handled properly. Each part is responsible for determining the proper use and handling in its facilities.
