ASTM D2007 for characteristic groups in processing oils & petroleum-derived oils
ASTM D2007 standard test method for characteristic groups in rubber extender and processing Oils and other petroleum-derived oils by the clay-gel absorption chromatographic method
10. Report
10.1 Report the following information:
10.1.1 Sample identification.
10.1.2 Saturate content, aromatic content, and polar content in mass %.
10.1.3 Method of determination of aromatic content: desorption (8.2) or difference (9.3).
10.1.4 If aromatics were desorbed, the percent recovery (9.2).
10.1.5 Asphaltene content if the method of Appendix X1 was used.
11. Precision and Bias
11.1 The precision of this test method as determined by statistical examination of interlaboratory results is as follows:
11.1.1 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 following values only in one case in twenty:
Saturate content, mass %: 2.1
Aromatic content, mass%: 2.3
Polar content, mass %
at polar contents of less than 1 %: 0.24
at polar contents of 1 to 5 %: 0.81
at polar contents of greater than 5 %: 1.2
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 this test method, exceed the following values only in one case in twenty:
Saturate content, mass %: 4.0
Aromatic content, mass%: 3.3
Polar content, mass %
at polar contents of less than 1 %: 0.4
at polar contents of 1 % to 5 %: 1.3
at polar contents of greater than 5 %: 1.8
11.1.3 The above precision statements do not include samples that have been prepared by removal of asphaltenes (Appendix X1). The precision on such samples is poorerthan the statements above.
11.2 Bias - The procedure for measuring saturates, aromatic, and polar contents has no bias because the values are defined only in terms of this test method.
12. Keywords
12.1 clay-gel absorption; elution chromatography; hydrocarbon type; liquid chromatography; petroleum derived oils; rubber extender oils; rubber processing oils
