GB/T 40442-2021 "Paper, board and pulps—Determination of mass factor in fibre composition analysis" is applicable to paper, board, and pulps composed of pure fibers, where pure fibers refer to a single type of fiber with other fiber content not exceeding 5%. The standard specifies two determination methods: the comparative method and the fiber coarseness method. The comparative method requires the preparation of gradient proportion mixtures, with fiber count and length calculated through microscopic statistics or measurements. The fiber coarseness method involves first testing fiber coarseness and then deriving the mass factor. The standard specifies reagent requirements, instrument specifications (including microscopes and fiber analyzers), sample preparation, and test operation procedures, and standardizes the calculation and presentation of results.
| Status | Active | ||
|---|---|---|---|
| CCS | Y30 | ICS | 85.040;85.060 |
| Release Date | 2021-08-20 00:00:00 | Implementation Date | 2022-03-01 00:00:00 |
