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GB/T 9973-2025: Test methods for permeability of carbon materials
Status: Valid GB/T 9973: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 9973-2025 | English | 279 |
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3 days [Need to translate]
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Test methods for permeability of carbon materials
| Valid |
GB/T 9973-2025
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| GB/T 9973-2006 | English | 189 |
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Test method for permeability of carbon materials
| Valid |
GB/T 9973-2006
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| GB/T 9973-1988 | English | 279 |
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Test method for the permeability of carbon materials
| Obsolete |
GB/T 9973-1988
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Basic data | Standard ID | GB/T 9973-2025 (GB/T9973-2025) | | Description (Translated English) | Test methods for permeability of carbon materials | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | Q50 | | Classification of International Standard | 29.050 | | Word Count Estimation | 14,119 | | Date of Issue | 2025-08-29 | | Date of Implementation | 2026-03-01 | | Older Standard (superseded by this standard) | GB/T 9973-2006 | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | GB/T 9973-2025: Test methods for permeability of carbon materials---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/GBT9973-2025
ICS 29.050
CCSQ50
National Standard of the People's Republic of China
Replaces GB/T 9973-2006
Test method for air permeability of carbon materials
Released on August 29, 2025
Implementation on March 1, 2026
State Administration for Market Regulation
The National Standardization Administration issued
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 9973-2006 “Test method for air permeability of carbon materials”.
In addition to the integration and editorial changes, the main technical content changes are as follows.
a) The scope has been changed (see Chapter 1, Chapter 1 of the.2006 edition);
b) Added terms and definitions (see Chapter 3);
c) Added principles (see Chapter 4);
d) Added instruments and equipment (see 5.1, 6.1);
e) Sampling and sample preparation have been modified (see 5.2, Chapter 4 of the.2006 edition);
f) The test steps have been changed (see 5.3, Chapter 5 of the.2006 edition).
g) Added test method 2 (external gas source method) (see Chapter 6);
h) The test report has been changed (see Chapter 8, Chapter 8 of the.2006 edition).
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 was proposed by the China Iron and Steel Association.
This document is under the jurisdiction of the National Technical Committee on Steel Standardization (SAC/TC183).
This document was drafted by. Jilin Carbon Co., Ltd., Guiyang Aluminum and Magnesium Design and Research Institute Co., Ltd., Hunan Zhiqiang Technology Co., Ltd., Fangda
Carbon New Materials Technology Co., Ltd., Chengdu Fangda Carbon Composite Materials Co., Ltd., Metallurgical Industry Information Standards Research Institute, Jimeng
Carbon Limited Liability Company.
The main drafters of this document are. Feng Ximing, Zhao Shigui, Jia Wentao, Deng Chao, Hu Chuang, Zhang Liqin, Cui Lingwei, Wang Xiaoyuan, Yao Luguang, Sun Jiyun,
He Yan, Yin Zhaoxia, Yang Bo, Zhang Songwei, Li Xingzuo, Gao Bo, Zhu Gang, and Wang Chenghua.
The previous versions of this document and the documents it replaces are as follows.
--- First issued as GB/T 9973-1988 in 1988, first revised in.2006;
---This is the second revision.
Test method for air permeability of carbon materials
1 Scope
This document describes the test method for the air permeability of carbon materials.
This document is applicable to the determination of the permeability of carbon materials at room temperature, and is also applicable to the determination of the permeability of blast furnace refractory materials.
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 8170 Rules for rounding off values and expression and determination of limit values
GB/T 8718 Terminology of Carbon Materials
3 Terms and Definitions
The terms and definitions defined in GB/T 8718 and the following apply to this document.
3.1
permeability
The characteristic value of the difficulty of gas passing through carbon material under a certain temperature and pressure difference.
Note. Air permeability is a property that changes according to the measurement direction (gas flow direction).
4 Principles
The gas with a certain pressure passes through the sample under laminar flow conditions, and the pressure difference at both ends of the sample is measured at different flow rates.
Calculate the air permeability of the sample based on the shape and size of the sample.
Laminar flow conditions refer to the flow in which the streamlines of the air flow are parallel to each other. The molding direction or the use direction of the specimen is usually set as the flow direction.
If the volume of gas passing through the sample in a given time is known, the air permeability can be calculated using formula (1).
t = K ×
h ×
(p1-p2)×
(p1 p2)
2p
(1)
Where.
V --- the volume of gas passing through the sample, in cubic meters (m3);
t --- the time it takes for the volume of gas to pass through the sample, in seconds (s);
K---air permeability of the sample, in square meters (m2);
η --- dynamic viscosity of the gas at the test temperature, in Pascal seconds (Pa·s);
A---cross-sectional area of the specimen, in square meters (m2);
h --- Sample height, in meters (m);
p---absolute pressure of gas, in Pascal (Pa);
p1---the absolute pressure of the gas entering the sample end, in Pascal (Pa);
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