GB/T 26464-2011 "Determination of Brightness (Whiteness) of Inorganic Pigments for Papermaking" specifies the method for determining the brightness (whiteness) of inorganic pigments used in papermaking, applicable to materials such as calcium carbonate, talc, and titanium dioxide. The method employs the diffuse/vertical geometry, using a brightness meter to measure the diffuse reflectance factor of pigment samples under D65 standard illuminant and 10° standard observer conditions. It details requirements for sample preparation (including drying, grinding, and pressing), instrument calibration, and testing procedures. The results are expressed as brightness values, ensuring uniformity in the determination of whiteness indicators for inorganic pigments in papermaking.
| Status | Active | ||
|---|---|---|---|
| CCS | Y30 | ICS | 85.010 |
| Release Date | 2011-05-12 00:00:00 | Implementation Date | 2011-09-15 00:00:00 |
