GB/T 21779-2025 English PDFGB/T 21779: Historical versions
Basic dataStandard 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light scattering Sector / Industry: National Standard (Recommended) Date of Implementation: 2025-12-01 Older Standard (superseded by this standard): GB/T 21779-2008 GB/T 21779-2008: Test method for particle size distribution of metal powders and related compounds by light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---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order. 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 ForewordThis 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 distribution1 ScopeThis 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 referencesThe 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 data3 Terms and DefinitionsASTMB243 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 DescriptionPrepared samples, with the water or other suitable organic liquid dispersion by circulating beam lamp or other suitable light source path. dry ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 21779-2025_English be delivered?Answer: Upon your order, we will start to translate GB/T 21779-2025_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 21779-2025_English with my colleagues?Answer: Yes. 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Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 21779-2025 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically. |
