13. Calculation and Reporting
13.1 Correct the observed refractive index by the amount shown in the calibration curve. Report the value of refractive index as:
14. Precision and Bias
14.1 The precision of the test method as obtained by statistical examination of interlaboratory test results is as follows:
14.1.1 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 0.00007 units of refractive index only in one case in twenty.
14.1.2 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 0.0006 units of refractive index only in one case in twenty.
NOTE 10 - The precision for this test method was not obtained in accordance with RR:D02-1007.
14.2 The bias for this test method has not been determined. Subcommittee D02.04.0D plans to cooperatively test modern refractometers and determine the bias.
15. Keywords
15.1 oils; purity; refractive index; refractometer; wax