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What are the specific regulations on the quality standards for nitrogen products in China

What are the specific regulations on the quality standards for nitrogen products in China
Nov 23, 2023
Author: DEAR AST

According to different uses, nitrogen products are divided into three types: industrial gaseous nitrogen, pure nitrogen, and high-purity nitrogen.

Industrial gaseous nitrogen is generally used as protective gas, and the technical indicators are in accordance with the provisions of GB3864-83, as shown in the table:

Indicator Name

Indicator

Class I

Class II

Level 1

Level 2

Nitrogen content (volume fraction)/% (not less than)

99.5

99.5

98.5

Oxygen content (volume fraction)/% (not greater than)

0.5

0.5

1.5

 

Moisture content per bottle of free water/mL (not more than)

 

100

Dew point/℃ (not greater than)

-43

 

Pure nitrogen is used as a replacement gas or protective gas in industries such as chemical, metallurgical, and electronic industries, with technical requirements in accordance with GB8979-88; High purity nitrogen is mainly used in the electronics industry or in the preparation of standard gas mixtures, with technical requirements in accordance with GB8980-88. The specific indicators are shown in the table below:

Indicator name

Pure nitrogen

High purity nitrogen

Excellent

Level 1

Excellent

Level 1

Level 2

Purity/%(not less than)

99.996

99.99

99.9996

99.9993

99.999

Oxygen content/10-6(not greater than)

10

50

1.0

2.0

3.0

Hydrogen content/10-6(not greater than)

5

10

0.5

1.0

1.0

Carbon monoxide content/10-6(not greater than)

5

5

1.0

2.0

3.0

Carbon dioxide content/10-6(not greater than)

5

10

Methane content/10-6(not greater than)

5

5

Water content/10-6(not greater than)

5

20

1.0

2.6

5.0

The purity in the table includes trace amounts of inert gases such as helium, argon, and neon; Liquid nitrogen does not have a specified moisture content.

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