ASTM D4312 Test Method for Toluene-Insoluble (TI) Content of Tar and Pitch (Short Method)
14. Report
14.1 Report the toluene-insoluble (TI) content to the nearest 0.1 %.
15. Precision and Bias
15.1 Based upon present available data, 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 1.0.
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 3.0.
15.2 Bias - During the interlaboratory study to determine the precision of this test method, the TI was also determined by Test Method D4072 (long method). It was found that the TI determined by Test Method D4312 was higher than that determined by Test Method D4072 by an average value of about 1 percentage point.
16. Keywords
16.1 beta resin; pitch; soft pitch; tar; toluene insolubles
