GB/T 40277-2021 "Paper, board and pulps — Measurement of diffuse blue reflectance factor (ISO brightness) — Indoor daylight conditions" is applicable to all types of paper, board, and pulps. It specifies the method for determining the diffuse blue reflectance factor (ISO brightness) using relevant instruments under indoor daylight conditions. The standard clarifies terms and definitions, instrument requirements, sample handling, and test conditions, standardizes the expression of results, and ensures consistency and accuracy in brightness measurement.
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 | Y30 | ICS | 85.010 |
| Release Date | 2021-05-21 00:00:00 | Implementation Date | 2021-12-01 00:00:00 |