EXPLANATION
This test method is useful in evaluating and characterizing tar and pitch, and as one element in establishing the uniformity of shipments and sources of supply. Since this method is empirical, strict adherence to all details of the procedure is necessary.
TEST SUMMARY
The sample is digested in hot quinoline and filtered. The insoluble material is washed, dried, and weighed.
TEST PRECISION
This test method has no bias because the value of quinoline insoluble is defined in terms of this test method.