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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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