GB/T 21779: Evolution and historical versions
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| GB/T 21779-2025 | English | RFQ |
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Test method for particle size distribution of metal powders and related compounds by light scattering
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GB/T 21779-2025
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| GB/T 21779-2008 | English | 134 |
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Test method for particle size distribution of metal powders and related compounds by light scattering
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GB/T 21779-2008
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Basic data | Standard ID | GB/T 21779-2025 (GB/T21779-2025) | | Description (Translated English) | Test method for particle size distribution of metal powders and related compounds by light scattering | | Sector / Industry | National Standard (Recommended) | | Date of Implementation | 2025-12-01 | | Older Standard (superseded by this standard) | GB/T 21779-2008 | GB/T 21779-2008: Test method for particle size distribution of metal powders and related compounds by light scattering
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Test method for particle size distribution of metal powders and related compounds by light scattering
ICS 13.300
A80
National Standards of People's Republic of China
Metal powders and related compounds granularity
Light scattering test methods for distribution
Posted 2008-05-12
2008-09-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard is equivalent to using ASTMB822.2002 standard "light scattering test methods for metal powder particle size distribution and related compounds."
This standard is managed by the National Standardization Technical Committee chemicals dangerous (SAC/TC251) and focal points.
Drafting of this standard. Guangdong Entry-Exit Inspection and Quarantine Hubei, Shenzhen CIQ.
The main drafters of this standard. Chen Qiang, Man Mo, Di Cuiping, Xiaoda Hui Peng-speed standard, Cui Hairong, Zheng Jianguo, Chen Wenjie, Wu Jingwu, Li Qingxiang.
This standard is the first release.
Metal powders and related compounds granularity
Light scattering test methods for distribution
1 Scope
This method is applicable to the light scattering method for the determination of particle size distribution and metal compounds and other granular material, results in volume percentage.
This method is suitable for the analysis of water-dispersible and non-aqueous dispersion of the sample, but also for the hygroscopic substance or substances like will react with the liquid carrier
Analysis of gas dispersed material was subjected to.
This method is applicable for the determination of particle size 0.4μm ~ 2000μm substance particle size distribution.
The standard unit The value of the SI units.
NOTE. This standard does not include the use of all the relevant safety precautions. When using the standard user has the responsibility to follow proper safety and health operations
specification.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
The first part of the laser diffraction particle size analysis ISO 13320-1. General
Practice for Sampling made of metal powder batches ASTMB215
ASTMB243 powder metallurgy term
Liquid dispersion guidelines for size analysis ASTMB821 metal powders and related compounds when
Report Rules ASTME1617 granularity characteristic data
3 Terms and Definitions
ASTMB243 established and the following terms and definitions apply to this standard.
3.1
Additional material by the non-detection of scattered light caused by the particles, including the detection light scattering caused by impurities in the road.
3.2
An optical theory, which describes the line is greater than the wavelength of the incident light particles small angle diffraction.
3.3
Describe the complex electromagnetic theory of spherical particles of light scattering. The general situation for the particle diameter of the incident light wavelength close, use particle
Real or presumed refractive index.
3.4
After a light scattering particle by another particle scattering again.
4 Test Method Description
Prepared samples, with the water or other suitable organic liquid dispersion by circulating beam lamp or other suitable light source path. dry
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