ASTM D6417 Estimation of Engine Oil Volatility by Capillary Gas Chromatography
11. Quality Control
11.1 The performance of this test method should be monitored by analyzing a quality control material with each batch of samples. Suitable reference materials are available from the ASTM Test Monitoring Center.
12. Precision and Bias
12.1 Precision - The precision of this test method as determined by the statistical examination of the interlaboratory test data for results between 1.8 and 19.8 % is as follows (see Table 4):
12.1.1 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 values by only one case in twenty.
Repeatability = 0.1352X(0.5)
where:
X = volatility level
12.1.2 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, exceed the following values only one case in twenty.
Reproducibility = 0.6036X(0.5)
where:
X = volatility level
12.2 Bias - No bias can be determined since the value for the percent volatilized at 371°C (700°F) is defined by the test method.
13. Keywords
13.1 boiling range distribution; engine oil, volatility; gas chromatography; lubricants; petroleum; simulated distillation; volatility
