GB/T 5162-2021

Metallic powders—Determination of tap density (English Version)

GB/T 5162-2021
Standard No.
GB/T 5162-2021
Language
Chinese, Available in English version
Release Date
2021
Published By
General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest
GB/T 5162-2021
Replace
GB/T 5162-2006
Scope
This standard specifies the method for the determination of the tap density of metal powders. This standard refers to the international standard ISO 3953-1977 "Metal powders - Determination of tap density".
Introduction

Background of Standard Revision

This standard is the second revised version of GB/T5162, and adopts the translation method to be equivalent to the ISO3953:2011 international standard. Compared with the 2006 version, the main technical changes involve 15 substantive revisions, reflecting the development trend of metal powder testing technology in the past 15 years.

Comparison of core changes

Technical elements 2006 edition 2021 edition Significance of revision
Measurement accuracy ±0.1cm³ ±0.2cm³(25cm³ measuring cylinder) Adapt to the testing needs of high-density powders
Compacting method Manual operation is allowed Delete the manual operation clause Unify the test method
Number of samples Mandatory 3 samples "If possible" take 3 portions Increase practical operation flexibility

Key instrument requirements

The new standard puts forward more stringent requirements for the vibration compaction device:

  • The amplitude remains unchanged at 3mm
  • The vibration frequency range is 100-300 times/min
  • The loosening of the surface layer is explicitly prohibited

Basis for selection of glass measuring cylinder:

For refractory metal powders with loose density＞4g/cm³, 25cm³ measuring cylinders are preferred, and the scale spacing is reduced to 0.2cm³ to meet the needs of high-precision measurement.

Implementation suggestions

  1. Equipment upgrade: Eliminate manual vibration equipment and adopt automatic vibration equipment that meets the standards of Figure 1
  2. Operation specification: It is recommended to vibrate 3000 times for fine powder and ≥2N times for conventional powder (N is the minimum number of times for volume stability)
  3. Data processing: The number of digits retained in the final result is distinguished according to the density value (≤4g/cm³ retains 0.1, >4g/cm³ retains 0.2)

Patent statement and centralized information

This standard is centralized by the National Technical Committee for Standardization of Nonferrous Metals (SAC/TC243), and it is specially reminded that there may be patent content but the issuing agency does not bear the responsibility for identification. The main drafting units include 18 institutions such as Shenzhen Zhucheng Technology and Northwest Institute of Nonferrous Metals.

GB/T 5162-2021 Referenced Document

GB/T 5162-2021 history



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