GB/T 2679.1-2020: Paper--Determination of transmittance--Diffuse reflectance measurement

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Scope

This Part of GB/T 2679 specifies the method for determination of transmittance by
diffuse reflectance measurement.
This Part applies to white and near-white translucent paper. To measure paper
containing fluorescent whitening agents, use a UV cut-off filter to eliminate
fluorescence excitation.
Note: Although GB/T 7973 allows the use of filter reflectometers and abridged spectrophotometers,
if the filter reflectometer cannot eliminate the excitation of fluorescence, it is not suitable for
testing the transmittance of paper containing fluorescent whitening agents.

Basic Data

Standard ID	GB/T 2679.1-2020 (GB/T2679.1-2020)
Description (Translated English)	Paper--Determination of transmittance--Diffuse reflectance measurement
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	Y30
Classification of International Standard	85.010
Word Count Estimation	10,147
Date of Issue	2020-07-21
Date of Implementation	2021-02-01
Older Standard (superseded by this standard)	GB/T 2679.1-2013
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration