QUINOLINE INSOLUBLE IN TAR AND PITCH BY PRESSURE FILTRATION: D4746
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. Both of these test methods give comparable results.
TEST SUMMARY
The sample is digested in hot quinoline and filtered through a heated pressure filter. The insoluble material is washed with hot, fresh quinoline and with cold acetone, dried and weighed.
TEST PRECISION
Repeatability: 0.2 %
Reproducibility: 0.3 %
