GB/T 5161-2025 Metallic powder—Determination of effective density—Liquid immersion method English, Anglais, Englisch, Inglés, えいご
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ICS 77. 160 CCS H 21
National Standard of the People's Republic of China
GB/T 5161-2025
Replaces GB/T 5161-2014
Metallic Powder—Determination of Effective Density—Liquid Immersion Method
Issued on 2025-08-29
Implemented on 2026-03-01
State Administration for Market Regulation
Standardization Administration of China
Contents
1 Scope
2 Normative References
3 Terms and Definitions
4 Principle
5 Reagents or Materials
6 Apparatus
7 Sample Preparation
8 Test Conditions
9 Procedure
10 Data Processing
11 Relative Error
12 Test Report
1. Scope
This document specifies the pycnometer method for determining the effective density of metallic powders.
It applies to metallic powders and may be referenced for measuring the true density of other sintered metallic materials (limited to particles or components without closed pores).
2. Normative References
GB/T 8170: Rules for rounding off numerical values and expression and judgement of limiting values.
3. Terms and Definitions
3.1 Effective Volume of Powder
The volume occupied by powder particles after excluding all open pores.
3.2 Effective Density of Powder
The mass of powder divided by its effective volume.
Note: Closed pores (if present) are considered part of the particle volume.
3.3 Pycnometry
A liquid immersion method using a pycnometer to determine the effective density of powders or granules.
4. Principle
A powder sample is placed in a pycnometer of known mass and volume, then immersed in a liquid medium. Vacuum degassing or ultrasonic baths ensure complete penetration of the liquid into open pores. Based on Archimedes' principle, the effective volume is measured, and the mass per unit volume (effective density) is calculated.
