ASTM D2619 Test Method for Hydrolytic Stability of Hydraulic Fluids (Beverage Bottle Method)
8. Report
8.1 The report shall include the following:
8.1.1 Acid number change of fluid in milligrams of KOH per gram,
8.1.2 Total acidity of water in milligrams of KOH,
8.1.3 Weight change of copper strip in milligrams per square centimetre, and
8.1.4 Appearance of strip under 20x magnification.
9. Precision and Bias
9.1 The precision as determined by statistical examination of interlaboratory result is as follows:
9.1.1 Repeatability - The difference between two test results obtained by the same operator with the same apparatus under constant operating conditions on identical test material would, in the long run, in the normal and correct operation of the test method, exceed the values given in Table 1 in only one case in twenty, where
X = the average of the two test results
9.1.2 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, in the normal and correct operation of the test method, exceed the values given in Table 1 in only one case in twenty, where
X = the average of the two test results.
NOTE 8 - These data are based on the use of a 200-mL (7-oz) glass Coca-Cola bottle at 93°C (200°F).
NOTE 9 - The precision data were derived from cooperative testing by ten laboratories on five reference fluids using the proposed hydrolytic stability test method. These reference fluids included four petroleum based fluids (regular, ashless, antiwear and multipurpose) and one phosphate ester. The data used to obtain Table 1 are available from ASTM Headquarters and may be obtained by requesting RR: D02-1154.
9.2 Bias - No statement on bias is possible, because there is no absolute value. The results are interpretable only with respect to this test.
10. Keywords
10.1 beverage bottle; copper corrosion; hydraulic fluid; hydrolytic stability
