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- Purity and Grades (529 KB)
Pure Gases
All pure gases are classified by grade, so you can be certain of purity levels. The first digit of the classification indicates the number of nines purity ( for example, n3.0 = 99.9% purity)
The second digit is the number following the last nine for example, N4.6 helium has a guaranteed minimum purity of 99.996% and a corresponding maximum impurity level of 0.004% or 40ppm
Click on the Purity and Grades PDF in related links for a full list of gases available.
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