GB/T 7974-2002
Paper,board and pulp-Measurement of brightness--Diff/Geometry (English Version)
- Standard No.
- GB/T 7974-2002
- Language
- Chinese, Available in English version
- Release Date
- 2002
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Status
- 2014-05
- Replace By
- GB/T 7974-2013
- Latest
- GB/T 7974-2013
- Scope
- This standard uses the diffuse reflection factor (%) of paper, cardboard and pulp to blue light with a dominant wavelength of 457nm under the simulated D65 light source and diffuse/vertical illumination observation conditions to express the brightness (whiteness) measurement results. For samples containing fluorescent whitening agents, the fluorescent whitening effect, that is, the fluorescent brightness (whiteness), can also be measured and calculated. In this standard method, the basic contents such as the value transfer method, the spectral and geometric characteristics of the instruments used are specified in GB/T 7973 "Measurement method for diffuse reflectance factor of pulp, paper and cardboard (diffuse/perpendicular method)" , so this standard should be read and implemented together with GB/T 7973 "Method for Determination of Diffuse Reflectance Factor of Pulp, Paper and Cardboard (Diffuse/Perpendicular Method)".
GB/T 7974-2002 history
- 2013 GB/T 7974-2013 Paper,board and pulps.Measurement of diffuse blue reflectance factor.D65 brightness(Diff/ Geometry, Outdoor daylight conditions)
- 2002 GB/T 7974-2002 Paper,board and pulp-Measurement of brightness--Diff/Geometry
- 1987 GB/T 7974-1987 Method for determination of whiteness of paper and board (diffuse/perpendicular method)
