ASTM D4636 test method for corrosiveness and oxidation stability of oils
ASTM D4636 Standard Test Method for Corrosiveness and Oxidation Stability of Hydraulic Oils, Aircraft Turbine Engine Lubricants, and Other Highly Refined Oils
12. Report
12.1 Report kinematic viscosity, expressed in centistokes (millimetres squared per second) for initial and final samples at 40 and 100°C. Report percentage change to the nearest 0.1 % from original viscosity for all periodic and final samples at 40°C and for final sample at 100°C.
12.2 Report the acid number for original and final samples, expressed in mg KOH/g. Report the change in neutralization number in milligrams KOH/g for all periodic and final samples.
12.3 Report the mass change of each metal specimen from the initial. When Appendix X2 cleaning is used, report mass change before and after electrocleaning or nitric acid soak. Express the change in milligrams per squared centimetres calculated to the nearest 0.1 mg/cm2.
12.4 Report the appearance of the metal specimens after cleaning with respect to any pitting, etching, or other corrosion observed without magnification and with 20x magnification.
12.5 Report the volume % of sludge in oil to the nearest 0.1 mL.
12.6 Report the weight percent of oil loss during test to the nearest 0.1 %.
12.7 Report the test conditions and any irregularities or deviations from required test procedures and conditions.
12.8 Report the presence of liquid or solid material on the inside of the condenser at the end of the test.
12.9 Report the appearance of the deposit on the sample tube at the end of the test.
13. Precision and Bias
13.1 Precision was determined under test conditions of 175°C for a 96-h duration using the standard test procedure and alternate Procedure 1. Precision for alternate Procedure 2 was not determined. The precision of this test method as determined by statistical examination of interlaboratory test results in the ranges indicated is stated in Tables 1-3.
13.1.1 Repeatability - The difference between successive test results obtained by the same operator with the same apparatus under constant operating conditions on identical test material would, in the long run, and in the normal and correct operation of the test method, exceed the following value only in one case in twenty.
13.1.2 Reproducibility - The difference between two single and independent results, obtained by different operators working in different laboratories on identical test material would, in the long run, and in the normal and correct operation of the test method, exceed the following value only in one case in twenty.
13.2 Bias - Since there is no acceptable reference material suitable for determining the bias procedure for measuring corrosiveness and oxidation stability of hydraulic oils, aircraft turbine engine lubricants, and other highly refined oils in Test Method D4636, bias cannot be determined.
14. Keywords
14.1 hydraulic fluid; lubricant; oxidation stability
