GB/T 42351.2-2024 English PDF

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GB/T 42351.2-2024: Preparation of particulate reference materials - Part 2: Polydisperse spherical particles
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Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 42351.2-2024	434	Add to Cart	4 days	Preparation of particulate reference materials - Part 2: Polydisperse spherical particles	Valid

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Basic data

Standard ID: GB/T 42351.2-2024 (GB/T42351.2-2024)
Description (Translated English): Preparation of particulate reference materials - Part 2: Polydisperse spherical particles
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: A28
Classification of International Standard: 19.120
Word Count Estimation: 22,294
Date of Issue: 2024-09-29
Date of Implementation: 2025-04-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 42351.2-2024: Preparation of particulate reference materials - Part 2: Polydisperse spherical particles

---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.
ICS 19.120 CCSA28 National Standard of the People's Republic of China Preparation of particle standard samples Part 2.Polydisperse spherical particles (ISO 14411-2.2020,IDT) Released on 2024-09-29 2025-04-01 Implementation State Administration for Market Regulation The National Standardization Administration issued

Table of Contents

Preface III Introduction IV 1 Scope 1 2 Normative references 1 3 Terms, definitions and symbols 1 3.1 Terms and Definitions 1 3.2 Symbol 2 4 Requirements for the preparation of polydisperse spherical particles 2 4.1 General requirements for standard sample production projects 2 4.2 General performance requirements for polydisperse particle samples 3 4.3 Particle size distribution of polydisperse particles 5 Characterization of polydisperse particles 4 5.1 Particle size distribution 4 5.2 Aspect Ratio 4 5.3 Apparent particle density 4 5.4 Refractive Index 4 6 Uncertainty estimation of particle size measurement 4 6.1 Sampling uncertainty 4 6.2 Other uncertainties 5 6.3 Expanded uncertainty of particle size distribution 5 Appendix A (Informative) Example of uncertainty estimation of particle size distribution based on N repeated measurements 7 Appendix B (Informative) Example of uncertainty estimation based on the number of particle size distributions for a single measurement 10 Appendix C (Informative) Conversion of number-based particle size distribution to volume-based cumulative particle size distribution that conforms to the log-normal particle size distribution Uncertainty estimation example 13 Reference 15

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting. This document is Part 2 of GB/T 42351 Preparation of particle standard samples. GB/T 42351 has been published in the following parts. --- Part 1.Polydisperse standards based on the picket fence distribution of monodisperse spherical particles; --- Part 2.Polydisperse spherical particles. This document is equivalent to ISO 14411-2.2020 "Preparation of particle standards Part 2.Polydisperse spherical particles". Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document was proposed and coordinated by the National Technical Committee for Particle Characterization and Sorting and Sieve Standardization (SAC/TC168). This document was drafted by. Huzhou Normal University, Zhejiang Humo Polishing Abrasives Manufacturing Co., Ltd., China Steel Group Ma'anshan Mining Institute New Materials Department Technology Co., Ltd., China National Institute of Metrology, Hefei Hongmeng Standard Technology Research Institute Co., Ltd., Shanghai Institute of Metrology and Testing Technology, Hunan Yineng Biopharmaceutical Co., Ltd., Yanqi Lake Basic Manufacturing Technology Research Institute (Beijing) Co., Ltd., Zhejiang Yuexu Materials Technology Co., Ltd. Shanghai University of Technology, Nanjing University of Science and Technology, China University of Metrology, Huzhou University, Zhejiang Taihu Yuanda New Materials Co., Ltd., Zhejiang Yan Daxin Materials Co., Ltd., China National Institute of Standardization, Hangzhou Bonston Wall Materials Co., Ltd. The main drafters of this document are. Cao Feng, Xu Chuanhua, Liu Yahui, Ji Xinglin, Zhang Wenge, Dou Xiaoliang, Wu Limin, Yi Yueneng, Hou Changge, Wang Jun, Wang Guanghui, Liu Lei, Li Yin, Zhou Wu, Wang Fenghe, Yang Yi, Zhu Peiwu, Yu Mingzhou, Pan Guoxiang, Chen Haifeng, Zhao Yong, Jiang Qunying, Lan Tao, Jin Chunxiang.

Introduction

There are a variety of testing techniques for measuring particle size distribution, and when measuring certain characteristics of particles, they are usually approximated to a round or spherical equivalent. When using these techniques to measure different properties of irregular particles, there are special requirements for the standardization of standard samples and measurement methods. Methods for measuring particle size distribution are inherently indirect, employing the measurement of some other property that is then approximated by an ideal shape and size. Therefore, these techniques usually require or assume some other specific constants. Information is used to calculate particle size distribution. Even if the measurement method does not require particle size calibration, standard samples are still required for quality control and operational verification. The particle size of such standard samples should be The distribution must conform to a standard whose values are traceable to the International System of Units (SI). Instrument manufacturers can demonstrate that all The calibration results of the input factors are verified and the output results are traceable to the International System of Units (SI). The product is preferably polydisperse spherical particles. In statistics, the unevenness of particle size distribution poses a great challenge to particle size analysis. GB/T 42351 aims to provide standard samples for comparison of results of different particle size measurement techniques. The preparation of particle standard samples composed of spherical particles is described, and the materials, preparation and characteristics of the standard samples are specified. composition. --- Part 1.Polydisperse standard samples based on the picket fence distribution of monodisperse spherical particles. Describes the polydisperse standard samples Materials and Preparation. --- Part 2.Polydisperse spherical particles. Describes the preparation of polydisperse standard samples and the characterization of particle size distribution. Preparation of particle standard samples Part 2.Polydisperse spherical particles

1 Scope

This document describes the preparation of spherical polydisperse particle standards with acceptable size distribution uncertainty and the characterization of their size distribution. Potential uses of standard samples include reliability testing of laser diffraction and other related particle size analysis methods. This document gives estimates of particle size polydispersity and the associated uncertainty. Small changes in particle size can result in large changes in the cumulative distribution. change. This document gives the necessary characteristics of particle standards intended for use in reliability testing of various types of particle size measurement equipment. This document does not address the requirements for processing, homogeneity and stability assessment and certification as described in ISO 17034.

2 Normative references

The contents of the following documents constitute essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document. Note. GB/T 15000.7-2021 Guidelines for the work of reference samples Part 7.General requirements for the competence of reference sample producers (ISO 17034.2016, IDT) 3 Terms, definitions and symbols 3.1 Terms and Definitions The following terms and definitions apply to this document. 3.1.1 aspect ratio The ratio of the minimum Feret diameter to the maximum Feret diameter of a particle. [Source. ISO 26824.2013, 4.5, modified] 3.1.2 apparent density The mass of a sample per unit volume. Note. The unit is grams per cubic centimeter (g/cm3). [Source. ISO 5755.2012, 3.10] 3.1.3 Standard sample reference material; RM A sample that is sufficiently homogeneous and stable in one or more specified properties and has been determined to be suitable for its intended use in the measurement process. [Source. ISO 17034.2016, 3.3] ......

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