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GB/T 10421-2025: Sintered metal friction materials - Determination of density
Status: Valid GB/T 10421: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 10421-2025 | English | 209 |
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3 days [Need to translate]
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Sintered metal friction materials - Determination of density
| Valid |
GB/T 10421-2025
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| GB/T 10421-2002 | English | 139 |
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Sintered metal friction materials -- Determination of density
| Valid |
GB/T 10421-2002
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| GB/T 10421-1989 | English | 199 |
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Sintered metal friction materials--Determination of density
| Obsolete |
GB/T 10421-1989
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PDF similar to GB/T 10421-2025
Basic data | Standard ID | GB/T 10421-2025 (GB/T10421-2025) | | Description (Translated English) | Sintered metal friction materials - Determination of density | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H72 | | Classification of International Standard | 77.160 | | Word Count Estimation | 10,139 | | Date of Issue | 2025-06-30 | | Date of Implementation | 2026-01-01 | | Older Standard (superseded by this standard) | GB/T 10421-2002 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 10421-2025: Sintered metal friction materials - Determination of density---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT10421-2025
National Standard of the People's Republic of China
ICS 77.160CCS H 72
Determination of density of sintered metal friction materials
Released on June 30, 2025
2026-01-01 implementation
State Administration for Market Regulation
The National Standardization Administration issued
Replaces GB/T 10421-2002
Table of Contents
Preface Ⅲ
1 Scope...1
2 Normative references 1
3 Terms and Definitions 1
4 Principles 1
5 Reagents...1
5.1 Impregnation reagents 1
5.2 Liquids 1
6 Instruments and Equipment...1
6.1 Analytical balance 1
6.2 Weighing device 2
6.3 Container Requirements 2
6.4 Thermometer 2
6.5 Hanging Silk...2
7 samples...2
8 Test steps 2
9 Test results 4
10 Precision...5
10.1 Repeatability 5
10.2 Reproducibility 5
10.3 Laboratory Research Results 5
11 Test Report 5
Appendix A (Informative) Laboratory Research Results 6
Figure 1 Hanging basket method 3
Figure 2.Lifting tray method 3
Table 1 Maximum recommended diameter of hanging wire 2
Table 2 Density of distilled water in air (at standard atmospheric pressure)...3
Table A.1 Density test results 6
Table A.2 Repeatability and reproducibility calculation results 6
Preface
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 is required.
This document replaces GB/T 10421-2002 "Determination of density of sintered metal friction materials". Compared with GB/T 10421-2002,
In addition to structural adjustments and editorial changes, the main technical changes are as follows.
a) The scope of application of this document has been changed (see Chapter 1, Chapter 1 of the.2002 edition);
b) Added a section on terms and definitions (see Chapter 3);
c) Added a principle chapter (see Chapter 4);
d) Added a chapter on reagents (see Chapter 5);
e) Added a chapter on instruments and equipment (see Chapter 6);
f) The accuracy requirements for analytical balances have been changed (see 6.1, 4.1 of the.2002 edition);
g) Added “maximum recommended diameter of hanging wire” (see Table 1);
h) The sample requirements have been changed (see Chapter 7, Chapter 3 of the.2002 edition);
i) The referenced standards have been changed (see 7.4, 3.4 of the.2002 edition);
j) Some expressions in the test procedures were changed (see Chapter 8, Chapter 4 of the.2002 edition);
k) Added a schematic diagram of the weighing device (see Figures 1 and 2);
l) Added “Density of distilled water in air (at standard atmospheric pressure)” (see Table 2);
m) The test results section was modified (see Chapter 9, Chapter 5 of the.2002 edition);
n) Added the precision section (see Chapter 10).
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 is proposed and coordinated by the China Machinery Industry Federation.
This document was drafted by. Hangzhou Advance Gearbox Group Co., Ltd., Huangshi Saifu Friction Material Co., Ltd., Beijing Youcai Bermuda
AVIATION SUPPLY LIMITED.
The main drafters of this document are. Yang Shuiyu, Zhang Guohong, Lü Bo, Wang Xiufei, Yan Yan, Jiang Junyong, He Chen, Xu Chengfa, and Xu Kun.
This document was first published as GB/T 10421-1989 in 1989, first revised in.2002, and this is the second revision.
Determination of density of sintered metal friction materials
1 Scope
This document describes the method for determining the density of sintered metal friction materials.
This document applies to the determination of the density of sintered metal friction materials without core plates.
2 Normative references
The contents of the following documents constitute the 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.
GB/T 3141-1994 Industrial liquid lubricants ISO viscosity classification
GB/T 5163-2006 Sintered metal materials (excluding cemented carbide) - Density, oil content and opening of permeable sintered metal materials
Determination of porosity
GB/T 8170 Rules for rounding off values and expression and determination of limit values
3 Terms and Definitions
There are no terms or definitions that require definition in this document.
4 Principles
Based on Archimedes' principle, the mass of a material sample is measured in air and in a liquid (distilled water) of known density.
Calculate the density of the material.
5 Reagents
5.1 Impregnation reagents
The impregnation agent is oil or paraffin. The impregnation oil is mechanical oil with ISO viscosity grade 15 or 32 specified in GB/T 3141-1994.
The paraffin wax used for immersion is a liquid paraffin wax at 160 ℃ ~ 180 ℃.
5.2 Liquids
The liquid can be distilled water or deionized water, and degassed water is recommended.
To prevent the surface from soaking, add a few drops of 0.05% (volume fraction) ~ 0.10% (volume fraction) wetting agent (sodium hexametaphosphate is recommended) to the water.
6 Instruments and Equipment
6.1 Analytical balance
With sufficient measuring range, the weighing accuracy reaches 0.01% of the sample mass.
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