13. Calculation
13.1 Calculate the toluene-insoluble (TI) content as follows:
TI, % = [(B - A)/C] x 100
where:
A = mass of alundum thimble without cone,
B = mass of alundum thimble plus toluene-insoluble material, and
C = mass of sample.
13.2 If the TI was determined on a wet tar sample (see 9.3.1), correct the TI value determined in 13.1 to a dry-tar basis as follows:
14. Report
14.1 Report the toluene-insoluble (TI) content to the nearest 0.1 %.
15. Precision and Bias
15.1 The following criteria shall be used for judging the acceptability of results (95 % probability):
15.1.1 Repeatability - Duplicate values by the same operator shall not be considered suspect unless the determined percentages differ by more than 0.9.
15.1.2 Reproducibility - The values reported by each of two laboratories, representing the arithmetic average of duplicate determinations, shall not be considered suspect unless the reported percentages differ by more than 2.0.
15.2 Bias This procedure has no bias because the value of toluene insoluble is defined in terms of this test method.
16. Keywords
16.1 extraction; pitch; tar; toluene-insolubles