ASTM D4746 for Determination of Quinoline Insolubles (QI) in Tar and Pitch
3. Summary of Test Method
3.1 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.
4. Significance and Use
4.1 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.
