Introduction
High purity nitrogen is essential in the manufacture of semiconductor chips, lasers, photomasks, and other technologies which require reliable, pure, and precise amounts of nitrogen. GB/T 8980-88 is a standard published by the China National Standardization Administration (CNSA) to provide guidance on the production and use of high purity nitrogen. This standard includes design requirements, purity levels, and performance criteria for the gas used in a variety of industries.
Designations of High Purity Nitrogen
The GB/T 8980-88 standard specifies the following four designations for high purity nitrogen (or nitrogen of technical purity):
1) UP (Ultra Pure): Nitrogen containing no more than 0.5 ppm oxygen, 0.5 ppm carbon dioxide, 0.1 ppm total hydrocarbons, and 0.01 ppm organics by volume.
2) HP (Highly Pure): Nitrogen containing no more than 1 ppm oxygen, 1 ppm carbon dioxide, 0.2 ppm total hydrocarbons, and 0.02 ppm organics by volume.
3) LPS (Low Pressure Storage): Nitrogen containing no more than 10 ppm oxygen, 10 ppm carbon dioxide, 0.5 ppm total hydrocarbons, and 0.05 ppm organics by volume.
4) IPS (Industrial Pure Storage): Nitrogen containing no more than 15 ppm oxygen, 15 ppm carbon dioxide, 1 ppm total hydrocarbons, and 0.1 ppm organics by volume.
Specifications and Requirements
The GB/T 8980-88 standard contains a variety of specifications and requirements for high purity nitrogen production and use. These specifications and requirements cover topics such as purity levels, packaging, storage, and handling of the nitrogen. Additionally, this standard also outlines the methods for testing the purity of nitrogen and the requirements for certifying nitrogen for use.
One of the most important aspects of this standard is the inclusion of purity levels for the nitrogen. Depending on the type of application for which nitrogen is being used, different purity levels are required. For example, higher purity oxygen is needed for use in the manufacture of semiconductor chips, while lower purity is acceptable for use in laser production. This standard defines minimum purity levels for each type of nitrogen application. These levels are often subject to periodic revisions as technology advances and new applications become available.
The GB/T 8980-88 standard also outlines the packaging and handling requirements for nitrogen. These requirements include the type of packaging and labeling that must be used, as well as the ways in which nitrogen should be handled. Additionally, the standard outlines the requirements for storage and transportation of the nitrogen, noting that nitrogen should always be stored at temperatures below freezing.
Conclusion
The China National Standardization Administration (CNSA) has developed a comprehensive set of standards for the production and use of high purity nitrogen. The GB/T 8980-88 standard outlines designations for nitrogen, as well as specifications and requirements for purity levels, packaging, storage, and handling of the gas. Through adherence to these requirements, manufacturers and users of nitrogen can ensure that their products and processes are reliable and safe.
