GB/T 31057.1-2014 in English

《GB/T 31057.1-2014颗粒材料 物理性能测试 第1部分：松装密度的测量》由TC168（全国颗粒表征与分检及筛网标准化技术委员会）归口，主管部门为国家标准化管理委员会。
GB/T31057的本部分规定了粉体松装密度测试的基本原则和方法。
本部分适用于固体颗粒直径5μm~5mm 的粉体。不在此范围内的粉体,可参照本部分使用。

Granular materials - The physical properties - Part 1: Determination of apparent density

1 Scope

This part of GB/T 31057 specifies the basic principle and methods of apparent density test for powder.

This part is applicable to powder with a diameter of 5μm~5mm of solid granules. It may also serve as a reference for powder beyond this range.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 5314 Powders for powder metallurgical purposes - Sampling

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

3.1
apparent density
mass per unit volume naturally filled by granular materials under specified conditions

4 Principle

Drop the powder from the funnel hole (fixed at a certain height) and fill the density cup with a known volume. Under apparent conditions, the apparent density of powder is expressed by the mass of powder per unit volume.

5 Experimental instruments, equipment and components

5.1 Instruments used for main experimental methods

5.1.1 General

This part gives the instrument diagrams of three methods. Any instrument which is made according to the principle of apparent density and may obtain the correct apparent density may be used. One or a combination of them may be adopted.

Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Experimental instruments, equipment and components
6 Pre-treatment
7 Measurement steps
8 Calculation of apparent density
9 Uncertainty
10 Test report
Annex A (Informative) Uncertainty evaluation
Annex B (Informative) Test report of apparent density