GB/T 2679.1-2020 Active
GB/T 2679.1-2020 Paper—Determination of transmittance—Diffuse reflectance measurement
Abstract
This part of GB/T 2679 specifies the method for determining the transparency of paper using the diffuse reflection method.
This part is applicable to semi-transparent paper that is white or close to white. When measuring paper containing fluorescent whitening agents, use an ultraviolet cutoff filter to eliminate the excitation of fluorescence.
Note: Although GB/T 7973 allows the use of filter-type reflectance photometers and simple spectroscopic reflectance photometers, if the filter-type reflectance photometer cannot eliminate the excitation of fluorescence, it is not suitable for testing the transparency of paper containing fluorescent whitening agents.
General Product Information
| Document Type | National standards |
|---|---|
| Standard Status | Active |
| Standard Code | GB/T 2679.1-2020 |
| CCS | Paper making |
| ICS | Comprehensive Paper-making Technology |
| Implement Date | 2021-02-01 |