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GB/T 8979-2025: Pure nitrogen, high purity nitrogen and ultra pure nitrogen
Status: Valid
GB/T 8979: Historical versions
| Standard ID | USD | BUY PDF | Lead-Days | Standard Title (Description) | Status |
| GB/T 8979-2025 | 199 |
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Pure nitrogen, high purity nitrogen and ultra pure nitrogen
| Valid |
| GB/T 8979-2008 | 70 |
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Pure nitrogen and high purity nitrogen and ultra-pure nitrogen
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| GB/T 8979-1996 | 199 |
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Pure nitrogen
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| GB 8979-1988 | 199 |
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Basic data
Standard ID: GB/T 8979-2025 (GB/T8979-2025)
Description (Translated English): Pure nitrogen, high purity nitrogen and ultra pure nitrogen
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: G86
Classification of International Standard: 71.100.20
Word Count Estimation: 10,144
Date of Issue: 2025-08-29
Date of Implementation: 2026-03-01
Older Standard (superseded by this standard): GB/T 8979-2008
Issuing agency(ies): State Administration for Market Regulation; Standardization Administration of China
GB/T 8979-2025: Pure nitrogen, high purity nitrogen and ultra pure nitrogen
---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/GBT8979-2025
ICS 71.100.20
CCSG86
National Standards of the People's Republic of China
Replaces GB/T 8979-2008
Pure nitrogen, high-purity nitrogen, and ultrapure nitrogen
Published on 2025-08-29
Implemented on 2026-03-01
State Administration for Market Regulation
The State Administration for Standardization issued a statement.
Foreword
This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents".
Drafting.
This document replaces GB/T 8979-2008 "Pure Nitrogen, High-Purity Nitrogen and Ultra-Purity Nitrogen". Compared with GB/T 8979-2008, the main differences are structural adjustments and...
Aside from editorial changes, the main technical changes are as follows.
---The scope has been changed (see Chapter 1, Chapter 1 of the.2008 edition);
---The technical requirements for pure nitrogen, high-purity nitrogen, and ultra-pure nitrogen have been revised (see Chapter 4, Chapter 3 of the.2008 edition);
---Sampling rules have been added (see Chapter 5);
---The calculation methods for the purity of pure nitrogen, high-purity nitrogen, and ultra-pure nitrogen have been changed (see 6.1, 4.2 of the.2008 edition);
---The methods for determining the content of hydrogen, oxygen, argon, carbon monoxide, carbon dioxide, and methane have been revised (see 6.2, 4.3 and 4.5 of the.2008 edition).
4.6);
---The method for determining moisture content has been changed (see 6.3, 4.4 in the.2008 edition);
---Added requirements for exhaust gas treatment (see 6.4);
---The inspection rules have been changed (see Chapter 7, 4.1 of the.2008 edition);
---The requirements for marking, packaging, transport, storage, and safety information have been changed (see Chapter 8, Chapter 5 of the.2008 edition).
Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.
This document was proposed by the China Petroleum and Chemical Industry Federation.
This document is under the jurisdiction of the National Technical Committee on Gas Standardization (SAC/TC206).
This document was drafted by. Southwest Branch of Haohua Gas Co., Ltd., China Academy of Testing Technology, and Zhejiang Provincial Special Equipment Research Institute.
Institute, Beijing Aerospace Metrology and Testing Technology Research Institute, Zhejiang Haichang Gas Co., Ltd., Zhejiang Shaxing Technology Co., Ltd., Chongqing Ruixin
Gas Co., Ltd., Fujian Jiuze Gas Co., Ltd., Sichuan Air Separation Equipment (Group) Co., Ltd., Yude Gas Co., Ltd.
Company, Beijing PURE Analytical Instruments Co., Ltd., Wuhan Huakang Century Medical Co., Ltd., Shenzhen Jiegongte Gas Technology Co., Ltd., Shanghai Hai
Zhou Special Gases Co., Ltd., Beijing Shougang Gas Co., Ltd., Fujian Hengshen Electronic Materials Technology Co., Ltd., and China Shipbuilding (Handan) Parry Special Gases Co., Ltd.
Gas Co., Ltd., Guizhou Provincial Institute of Product Quality Inspection and Testing, Dalian Date Gas Co., Ltd., Shanghai Huaai Chromatography Analysis Technology Co., Ltd.
The company, Sichuan University, Shenyang Zhongfu Kejin Pressure Vessel Co., Ltd., Beijing Ruixinjie Environmental Protection Technology Co., Ltd., China Metrology and Testing Society
Shanghai Institute of Metrology and Testing Technology, Dalian Kerui Gas Co., Ltd., Hangzhou New Century Mixed Gas Co., Ltd., Harbin Liming Gas
Limited Liability Company, National Institute of Metrology, School of Modern Science and Technology, China Jiliang University, Superspectrum Technology (Chengdu) Co., Ltd., Kunming Guangruida Special Equipment Co., Ltd.
Air Liquide (China) Co., Ltd., Meishan Microelectronics Equipment Co., Ltd., Langxi Instruments (Shanghai) Co., Ltd., Air Liquide (China) Investment Co., Ltd.
Investment Co., Ltd., Shanghai Fanwei Instrument Equipment Co., Ltd., and Southwest Chemical Research and Design Institute Co., Ltd.
The main drafters of this document are. Lai Xiaofeng, Li Cui, Zhou Haibin, Bu Fang, Chen Chongwen, Lin Dingbiao, Wang Wenxiu, Jiang Yuejun, Jin Xingyi, and Wu Yuqiang.
He Jingyu, Huang Zhenyu, Fan Wei, Sun Riguang, Shi Lan, Fan Yexu, Liu Junhang, Zhou Minglong, Wang Linzhang, Ma Hailong, Liao Hongchang, Ma Binqi, Zhang Changjin
Zhu Jiangtao, Cheng Huapeng, Li Xinran, Wang Chuanfu, Fang Hua, Li Zhiang, Gong Bing, Wang Dawei, Zhao Jie, Yang Yangzhongfu, Gao Yanqiu, Ren Yichen, Lu Changmin
Shen Yuanjie, Wu Guozhong, Shao Chenggang, Lü Houchun, Hu Shuguo, Chen Hui, Qu Qiang, Hou Jiawei, Gao Jing, Zhang Yishan, Li Jianhao, Wang Xiangke, Yin Hao
Zhu Anmin, He Bo, Tang Zhongwei, Zhou Pengyun, Tang Xiamei.
The release history of this document and the document it replaces is as follows.
---First published as GB 8979-1988 in 1988, and revised for the first time in.1996;
---In the second revision in.2008, the content of GB/T 8980-1996 "High Purity Nitrogen" was incorporated (all previous revisions of GB/T 8980-1996)
The version release is GB/T 8980-1988.
---This is the third revision.
Pure nitrogen, high-purity nitrogen, and ultrapure nitrogen
1.Scope
This document specifies the technical requirements, sampling, testing methods, inspection rules, marking, packaging, filling, and transportation of pure nitrogen, high-purity nitrogen, and ultra-pure nitrogen.
The document also outlines storage requirements and provides safety information for pure nitrogen, high-purity nitrogen, and ultrapure nitrogen.
This document applies to gaseous and liquid pure nitrogen, high-purity nitrogen, and ultrapure nitrogen obtained by separation from or purification of air.
2 Normative references
The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.
For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.
This document.
GB 190 Packaging Marks for Dangerous Goods
GB/T 3864 Industrial Nitrogen
GB/T 5099 (all parts) Seamless steel gas cylinders
GB/T 5832.2 Gas analysis – Determination of trace moisture – Part 2.Dew point method
GB/T 5832.3 Gas Analysis - Determination of Trace Moisture in Gases - Part 3.Cavity Ring-down Spectroscopy
GB/T 6285 Determination of trace oxygen in gases by electrochemical method
GB/T 7144 Color Marking for Gas Cylinders
GB/T 8170 Rules for rounding off numerical values and the representation and determination of limiting values
GB/T 11640 Seamless Aluminum Alloy Gas Cylinders
GB/T 14194 Regulations for Filling Compressed Gas Cylinders
GB 15258 Regulations for Writing Safety Labels for Chemicals
GB/T 16804 Warning Labels for Gas Cylinders
GB/T 24159 Welded Insulated Gas Cylinders
GB/T 28726 Gas Analysis - Helium Ionization Gas Chromatography
GB/T 33145 Large-capacity seamless steel gas cylinders
GB/T 34528 Filling Specifications for Gas Cylinder Bundles
GB/T 43306 Sampling Guidelines for Gas Analysis
JB/T 6898 Safety Rules for the Use of Cryogenic Liquid Storage and Transportation Equipment
TSGR0005 Safety Technical Supervision Regulations for Mobile Pressure Vessels
TSG23 Gas Cylinder Safety Technical Regulations
3.Terms and Definitions
This document does not contain any terms or definitions that need to be defined.
4.Technical Requirements
The technical requirements for pure nitrogen, high-purity nitrogen, and ultrapure nitrogen shall comply with the provisions of Table 1.
Table 1 Technical Requirements
project
index
Pure nitrogen, high-purity nitrogen, ultra-pure nitrogen
Nitrogen (N2) purity (mole fraction) ≥99.99×10⁻² ≥99.999×10⁻² ≥99.9999×10⁻²
Hydrogen (H2) content (mole fraction) < 15×10⁻⁶ < 1×10⁻⁶ < 0.1×10⁻⁶
Oxygen (O2) content (mole fraction) < 50 × 10⁻⁶ < 3 × 10⁻⁶ < 0.1 × 10⁻⁶
Argon (Ar) content (mole fraction) - to be negotiated between the supplier and the buyer.
Carbon monoxide (CO) content (mole fraction) < 5×10⁻⁶ < 1×10⁻⁶ < 0.1×10⁻⁶
Carbon dioxide (CO2) content (mole fraction) < 10 × 10⁻⁶ < 0.5 × 10⁻⁶ < 0.1 × 10⁻⁶
Methane (CH4) content (mole fraction) < 5×10⁻⁶ < 1×10⁻⁶ < 0.1×10⁻⁶
Moisture (H2O) content a (mole fraction) < 15×10⁻⁶ < 3×10⁻⁶ < 0.5×10⁻⁶
Total impurity content (mole fraction) ≤100×10⁻⁶ ≤10×10⁻⁶ ≤1×10⁻⁶
a. Liquid nitrogen does not have a specified moisture content.
5.Sampling
It should comply with the provisions of GB/T 43306.
6.Test Methods
6.1 Purity of pure nitrogen, high-purity nitrogen, and ultrapure nitrogen
6.1.1 Calculation of total impurity content
6.1.1.1 The total impurity content in gaseous pure nitrogen, high-purity nitrogen, and ultrapure nitrogen is calculated according to formula (1).
x7 = x1 x2 x3 x4 x5 x6 (1)
In the formula.
x1 --- Hydrogen content (mole fraction);
x2 --- Oxygen content (mole fraction);
x3 --- Carbon monoxide content (mole fraction);
x4 --- Carbon dioxide content (mole fraction);
x5 --- Methane content (mole fraction);
x6 --- Moisture content (mole fraction);
x7 --- Total impurity content (mole fraction) in gaseous pure nitrogen, high-purity nitrogen, and ultrapure nitrogen.
6.1.1.2 The total impurity content in liquid pure nitrogen, high-purity nitrogen, and ultrapure nitrogen is calculated according to formula (2).
x8 = x1 x2 x3 x4 x5 (2)
In the formula.
x8 --- Total impurity content (mole fraction) in liquid pure nitrogen, high-purity nitrogen, and ultrapure nitrogen.
6.1.2 Calculation of Nitrogen Purity
6.1.2.1 The purity of gaseous pure nitrogen, high-purity nitrogen, and ultrapure nitrogen is calculated according to formula (3).
x9 = (100 - x7 × 102) × 10⁻² (3)
In the formula.
x9 --- The purity of gaseous pure nitrogen, high-purity nitrogen, and ultrapure nitrogen.
6.1.2.2 The purity of liquid pure nitrogen, high-purity nitrogen, and ultrapure nitrogen is calculated according to formula (4).
x10=(100-x8×102)×10-2 (4)
x10 --- The purity of liquid pure nitrogen, high-purity nitrogen, and ultrapure nitrogen.
6.2 Determination of the content of hydrogen, oxygen, argon, carbon monoxide, carbon dioxide and methane
6.2.1 Determination Method
6.2.1.1 Determine the content of hydrogen, argon, carbon monoxide, carbon dioxide and methane according to the method specified in GB/T 28726.
6.2.1.2 Determine the oxygen content according to the method specified in GB/T 6285.Alternatively, it can be determined according to GB/T 28124, GB/T 28726, GB/T 37182, or other standards.
When there is a dispute over the test results, the method specified in GB/T 6285 shall be used as the arbitration method.
6.2.1.3 The contents of hydrogen, argon, carbon monoxide, carbon dioxide, and methane may be determined by other equivalent methods specified in 6.2.2.When the determination results are...
In case of any objection, the arbitration method specified in GB/T 28726 shall apply.
6.2.2 Other equivalent determination methods
6.2.2.1 The content of hydrogen, argon, carbon monoxide, carbon dioxide and methane can be determined according to the method specified in GB/T 37182.
6.2.2.2 The content of hydrogen, carbon monoxide and methane can be determined according to the method specified in GB/T 28124.
6.2.2.3 The content of carbon monoxide, carbon dioxide and methane can be determined according to the method specified in GB/T 8984.
6.3 Determination of Moisture Content
6.3.1 Determination of moisture content in pure nitrogen
Perform according to GB/T 5832.2.It can also be determined according to GB/T 5832.1, GB/T 5832.4, or other equivalent methods. When measuring...
In case of disagreement regarding the determination result, the method specified in GB/T 5832.2 shall be the arbitration method.
6.3.2 Determination of moisture content in high-purity nitrogen and ultrapure nitrogen
Perform according to GB/T 5832.3.Alternatively, GB/T 5832.1, GB/T 5832.2, GB/T 5832.4, or other equivalent methods may be used.
Determination. In case of any dispute over the determination results, the method specified in GB/T 5832.3 shall be the arbitration method.
6.4 Exhaust Gas Treatment
During the measurement, the accumulation of pure nitrogen, high-purity nitrogen, and ultrapure nitrogen in the room should be prevented.
7 Inspection Rules
7.1 Batching, sampling, judgment, and retesting of bottled pure nitrogen and high-purity nitrogen
7.1.1 Bottled pure nitrogen and high-purity nitrogen products produced continuously and stably on the same production line constitute a batch, with each batch not exceeding 300 bottles.
7.1.2 For bottled pure nitrogen and high-purity nitrogen, random sampling inspection shall be carried out according to the sampling quantity specified in Table 2.
......
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