GB/T 33075-2016 "Reactive Dyes—Determination of Substantivity" is applicable to the determination of the substantivity of KN-type and M-type reactive dyes, specifying specific testing methods. By controlling the dyeing conditions using a laboratory dyeing machine, the sample is dyed on cotton yarn for 30 minutes. A spectrophotometer is used to measure the absorbance values of the dyeing residual liquor before alkali addition and the standard dyeing liquor, with the substantivity of the dye expressed as the dye uptake percentage. The standard clarifies dyeing parameters and instrument operation requirements, providing a unified standard for evaluating the dyeing performance of dyes.
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 | G55 | ICS | 71.100.01;87.060.10 |
| Release Date | 2016-10-13 00:00:00 | Implementation Date | 2017-05-01 00:00:00 |
