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

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".

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