ASTM D6450 method for flash point by continuously closed cup (CCCFP) tester
13. Report
13.1 Report the corrected flash point as the Test Method D6450, CCCFP of the test specimen.
14. Precision and Bias
14.1 The precision data were developed in a 1996 cooperative test program involving ten laboratories and using three pure chemicals, one pure hydrocarbon, three fuels, and three lubricating oils. The precision statements for both repeatability and reproducibility are for flash points between 10 and 250°C and do not include the No. 6 fuel oil data.
NOTE 6 - The precision derived in the cooperative test program for No. 6 fuel oil was significantly worse than for the other samples. It has to be assumed that the procedure described in Section 11 is not applicable for this kind of sample.
14.2 Precision - The precision of the procedure for CCCFP, as determined by the statistical examination of the interlaboratory test results, is as follows:
14.2.1 Repeatability - The difference between successive results obtained by the same operator with the same apparatus under constant operating conditions on identical test materials would, in the long run, in the normal and correct operation of the test method, exceed the following values in only one case in twenty.
Repeatability r = 1.9°C
14.2.2 Reproducibility - The difference between two single and independent results obtained by different operators working in different laboratories on identical material would, in the long run, in the normal and correct operation of the test method, exceed the following values in only one case in twenty.
Reproducibility R = 3.1°C
14.2.3 Bias - Since there is no accepted reference material suitable for determining the bias for the procedure in this test method, bias has not been determined.
15. Keywords
15.1 continuously closed cup; flammability; flash point
