ASTM D3607 Test Method for Removing Volatile Contaminants from Used Engine Oils
ASTM D3607 Standard Test Method for Removing Volatile Contaminants from Used Engine Oils by Stripping
10. Report
10.1 Report the result as volatile contaminants content, mass percent ASTM D3607.
10.2 Report the time, if any, that a nitrogen flow rate of 50 cm3/min was used due to excessive frothing.
11. Precision and Bias
11.1 The following criteria should be used for judging the acceptability of results (95 % confidence) (Note 8 and Note 9):
11.1.1 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, in the normal and correct operation of the test method, exceed the following value only in one case in twenty: 0.27 mass %.
11.1.2 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 following value only in one case out of twenty: 1.40 mass %.
NOTE 8 - The precision reported here was obtained by a round-robin program using a stripping temperature of 87.8°C and a stripping time of 4.5 h. Kinematic viscosity results on the stripped samples were determined at 98.9°C.
NOTE 9 - The precision of kinematic viscosity determinations on oils after stripping by this test method will not usually be as good as the precision stated in Test Method D 445. Results of duplicate stripping operations on two portions of the same oil by the same operator in the same laboratory should be considered suspect if the difference in the measured kinematic viscosities after stripping is greater than 1.4 % of their mean. Results on the same oil after stripping in each of two laboratories should be considered suspect if the difference in the measured kinematic viscosities after stripping is greater than 2.8 % of their mean. The precision of kinematic viscosity measurements on gelled used engine oils may be much poorer than this. Gelled oils are defined as oils that develop structure on standing, but that become much more fluid with light agitation.
11.2 Bias - The procedure in this test method for measuring volatile contaminants in used engine oils has no bias because the mass percent of volatile materials can only be defined in terms of the test method.
12. Keywords
12.1 contaminants; engine oils; gasoline dilution; used engine oils; water contamination
