ASTM D2764 Standard Test Method for Dimethylformamide-Insoluble (DMF-I) Content of Tar and Pitch
14. Report
14.1 Report the percentage of matter insoluble in dimethylformamide (DMF-I) to the nearest 0.1 %. Duplicate runs that agree within 1.0 % absolute are acceptable for averaging (95 % confidence level).
15. Precision and Bias
15.1 The following criteria should be used for judging the acceptability of results.
15.1.1 Repeatability - The average difference between two results (each the average ofduplicate determinations), obtained by the same analyst on different days, will approximate 0.4 %. Two such values should be considered suspect (95 % confidence level) if they differ by more than 1.0 % absolute.
15.1.2 Reproducibility - The average difference between two results (each the average of duplicate determinations), obtained by analysts in different laboratories, will approximate 0.8 %. Two such values should be considered suspect (95 % confidence level) if they differ by more than 2.5 % absolute.
15.2 Bias - This test method has no bias because the value of DMF-1 is defined in terms of this test method.
16. Keywords
16.1 dimethylformamide; insoluble; insoluble matter; pitch; tar
