This document specifies the reagent materials, instruments and equipment, test procedures, data processing, tolerances, etc. for the determination of n-heptane insoluble content of coking products. This document is applicable to the determination of n-heptane insoluble matter content in coking products such as coking raw oil for carbon black, coal tar, and coal pitch.
YB/T 4991-2022 history
2022YB/T 4991-2022 Determination of n-heptane insoluble matter content of coking products