GB/T 747-2003 "Pulp—Determination of acid-insoluble lignin" specifies the method for determining acid-insoluble lignin in pulp. It is applicable to various types of unbleached pulp, as well as semi-bleached or bleached pulp with a lignin content higher than 1%. The pulp is hydrolyzed with sulfuric acid, and the acid-insoluble lignin residue is separated by filtration. After washing, drying, and weighing, the content is calculated. This standard replaces GB/T 747-1989 and provides data support for the evaluation of pulp raw materials and process optimization.
This summary is not the original standard text and is for reference only. For accurate information, please obtain it through official channels.
| Status | Active | ||
|---|---|---|---|
| CCS | Y31 | ICS | 85.040 |
| Release Date | 2003-08-25 00:00:00 | Implementation Date | 2003-12-01 00:00:00 |