There are high purity, low purity and even ordinary nitrogen. So what is the difference between them? This article will explain to you the difference between high purity nitrogen and ordinary nitrogen.
Purity level
Ordinary nitrogen usually refers to nitrogen products obtained through air separation technology, and its purity range is generally between 95% and 99.5%. For example, some industrial uses may require only 97% nitrogen purity, which is sufficient to meet most conventional needs such as gas replacement in food packaging to extend shelf life.
In contrast, the purity of high-purity nitrogen can be as high as 99.999%, which is the so-called "5 9s", or even higher. This level of nitrogen is often used in scenarios where extremely high purity is required, such as the chemical vapor deposition CVD process during semiconductor manufacturing, where the presence of impurities may seriously affect product quality.
Differences in application fields
Due to the different purity, high-purity nitrogen and ordinary nitrogen are suitable for different application scenarios. Ordinary nitrogen is widely used in the food industry, metal processing (such as laser cutting), and some basic chemical production processes. For example, in the food industry, packaging with nitrogen with a purity of 98% can effectively prevent food oxidation and maintain freshness.
On the other hand, high-purity nitrogen is used in more refined and sensitive fields. In the electronics manufacturing industry, in order to ensure the reliability and performance of circuit boards, the nitrogen purity used must reach more than 99.999%. This is because even trace amounts of oxygen or other impurities can cause welding defects or material degradation, affecting the quality of the final product.
In addition, high-purity nitrogen is also required to avoid interference in laboratory studies, especially when it involves trace analysis or precise measurement. For example, in chromatographic analysis, if a lower purity nitrogen is used as the carrier gas, the detection results may be inaccurate.
Impact on production process
In some high-end manufacturing processes, the quality of nitrogen is directly related to the quality of the finished product. Taking optical fiber manufacturing as an example, it is necessary to use extremely high purity nitrogen as a protective gas during the production process to prevent the glass fiber from reacting with oxygen in the environment at high temperatures. Research shows that when the nitrogen purity increases from 99.99% to 99.999%, the transmission loss rate of the optical fiber can be reduced by about 0.02 dB/km, which is a very important improvement for long-distance communication networks.
Similarly, in the pharmaceutical industry, especially in the production and storage of sterile drugs, the use of high-purity nitrogen can reduce the risk of microbial contamination and improve the safety and stability of drugs. A survey of water systems for injection found that microbial contamination rates dropped by nearly 50% after flushing the system with high purity nitrogen.
The difference between high-purity nitrogen and ordinary nitrogen is not only in the difference in purity, but more importantly, their respective applicable application scenarios and impact on the quality of the final product. With the development of science and technology, high purity nitrogen has become an indispensable resource for many precision manufacturing and scientific research. However, when choosing the right type of nitrogen, cost-effective ratios should also be taken into account, as pursuing too high purity is not always necessary, and the key is to find the best balance point to meet specific needs.
