GB/T 23774-2009Inorganic chemicas for industrial use - General method for the determination of whiteness (English PDF)
无机化工产品白度测定的通用方法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
May 13, 2009
Implementation date
January 1, 2010
Scope
GB/T 23774-2009 is the English-translated version of 无机化工产品白度测定的通用方法.
GB/T 23774-2009 is the Chinese standard "Inorganic chemicals for industrial use -- General method for the determination of whiteness".
Its scope clause reads: This Standard specifies the terms and definitions, instruments and apparatuses, test procedures and result calculation of the general method for the determination of whiteness of inorganic chemicals for industrial use by the whiteness meter.
This Standard applies to the determination of whiteness of powder products in inorganic chemicals for industrial use. Its clauses include terms and definitions; instruments and apparatuses; test procedures; result calculation.
It was issued by the General Administration of Quality Supervision, Inspection and Quarantine on MAY 23, 2009 and took effect on JANUARY 01, 2010.
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Document preview — GB/T 23774-2009
National Standard of the People's Republic of China
- ICS
- 71.060.01
- Classification
- G 10
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword3
- 1 Scope4
- 2 Normative references4
- 3 Terms and definitions4
- 4 Instruments and apparatuses5
- 5 Test procedures6
- 6 Result calculation7
1 Scope
This Standard specifies the terms and definitions, instruments and apparatuses, test procedures and result calculation of the general method for the determination of whiteness of inorganic chemicals for industrial use by the whiteness meter.
This Standard applies to the determination of whiteness of powder products in inorganic chemicals for industrial use.
2 Normative references
The terms in the following documents become the terms of this Standard by reference to this Standard. For dated references, all subsequent amendments (not including errata content) or revisions do not apply to this standard. However, parties to agreements that are based on this Standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest edition applies to this Standard.
GB/T 3979, Methods for the measurement of object color
GB/T 9086, The white standard plate for colorimetry and photometry
GB/T 5950, Method for measurement of whiteness of building materials and non-metal mineral products
3 Terms and definitions
The following terms and definitions are applicable to this Standard.
3.1 Whiteness
It refers to the ratio of the amount of diffusely reflected radiant energy on the surface of the measured object in the visible light region to that of a completely white (standard white) object, which is expressed in percentages. It is the degree of whiteness, called whiteness.
4 Instruments and apparatuses
4.1 Whiteness meter
4.1.1 The whiteness meter that is used in this Standard is illuminated by D65 or A light source; the illumination and observation condition can be any one of vertical/diffusion (0/d) and diffusion/vertical (d/0).
4.2 Standard white plate Ceramic
standard white plate and powder standard white plate (magnesium oxide and barium sulfate) shall meet the requirements of GB/T 9086.
4.3 Working standard white plate
For the convenience of measurement, a white ceramic plate with a smooth surface, no stains, no cracks, and no scratches that affect its performance can be used as a working standard white plate for daily calibration of instrument values. The working standard white plate shall meet the requirements of GB/T 3979 Methods for the measurement of object color.
4.4 Constant pressure powder compactor
The constant pressure powder compactor and compaction box are shown in Figure 1.
5 Test procedures
5.1 Sample preparation. fully mix the taken samples; use the quarter method to reduce the average sample whose total amount is not less than 500 g; according to the sample pressing steps, press a sample surface of flat surface without roughness for instrument measurement.
5.3 Perform the instrument adjustment in accordance with the requirements of the instrument manual; measure the sample.
5.5 If an indentation is found after the same sample is measured, the measured data shall invalid and another measurement shall be taken.
5.2 Steps for pressing the sample
5.4
Under the same test conditions, the difference between the three consecutive measurement results is not more than 0.3, or the difference between the two measurement results before and after rotating the sample angle is not more than 0.6. The average value of the measurement results that meet the above requirements is the whiteness value of the sample.
6 Result calculation
6.1 The blue reflection whiteness is calculated by wr, according to Formula (1). Where.
6.2 Ganz whiteness is calculated by wg, according to Formula (2).
6.3 The whiteness of building materials is calculated by wj, according to Formula (3). […]
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Normative references
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