13. Calculation
13.1 Method A - No further calculations are required as the effects of barometric pressure were corrected for in Eq 1-3 in 11.1.
13.1.1 If the effects of barometric pressure were not corrected before the flash/no flash test, Eq 4-6 shall be used to calculate the corrected test temperature.
Corrected (specification) test temperature (°C) = C + 0.25(101.3 - A)
Corrected (specification) test temperature (°F) = F + 0.06(760 - B)
Corrected (specification) test temperature (°C) = C + 0.03(760 - B)
where:
C = actual test temperature, °C,
F = actual test temperature, °F,
A = ambient barometric pressure, kPa, and
B = ambient barometric pressure, mm Hg.
13.2 Method B - If the ambient barometric pressure (9.5) differs from 101.3 kPa (760 mm Hg) correct the flash point as follows:
Corrected flash point (°C) = C + 0.25(101.3 - A)
Corrected flash point (°F) = F + 0.06(760 - B)
Corrected flash point (°C) = C + 0.03(760 - B)
where:
C = observed flash point, °C,
F = observed flash point, °F,
A = ambient barometric pressure, kPa, and
B = ambient barometric pressure, mm Hg.
14. Report
14.1 Method A (flash/no flash), report flash (or no flash) at the specification (corrected) temperature (report temperature) rounded to the nearest 0.5°C (1°F), and that Method A was used.
14.2 Method B (flash point determination), report the corrected flash point rounded to the nearest 0.5°C (1°F), and that Method B was used.
14.3 Report the identification of the material tested, the test date and any deviation, by agreement or not, from the procedures specified.
15. Precision and Bias
15.1 Precision - The precision of this test method as determined by statistical examination of interlaboratory results is as follows. See Annex A3 for provisional precision of fatty acid methyl esters (FAME).
NOTE 2 - The precision or relative bias has not yet been determined when using electric ignitors. However supporting data, covering the 22 to 110°C range, has been made available. A full interlaboratory study is being planned in conjunction with the Energy Institute to reestablish the precision of this test method, and to establish the degree of agreement between gas and electric ignitors.
15.1.1 Repeatability - The difference between the 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 this test method, exceed the values shown in Table 2 only in 1 case in 20.
15.1.2 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 values shown in Table 2 only in 1 case in 20.
15.2 Bias - The procedure in this test method has no bias because flash point can be defined only in terms of a test method.
16. Keywords
16.1 combustible; fire risk; flammable; flash point; volatile