Sometimes even the slightest amount of impurities can cause problems. That is when you will need high purity gases.
The purity in gases is normally expressed by combining the purity unit N with a figure, for instance N46. This means that the percentage value, 99,996 %. that indicates the purity of gas, has four nines (9) and ends with number six (6).
The following table lists the most typical purity classes with total impurity content
| Figure N | Total content | Impurities |
|
N26 |
99,6% | 0,4% |
| N35 | 99,95% | 500 ppm |
| N45 | 99,995% | 50 ppm |
| N50 | 99,999% | 10 ppm |
| N55 | 99,9995 % | 5 ppm |
| N60 | 99,9999% | 1 ppm |
1 % = 10 000 ppm (parts per million,)
The required purity limit is determined by the gas in question as well as a the desired purity level that meets the technological and econimical objectives.
If you need UHP gas that was not listed above, contact us, and we will obtain it via our international partners.