
Intoxicated
M
- Nov 16, 2023
- 737
Can you elaborate the need for such a high purity? I don't see reasons why 98 - 98.5% Ar wouldn't work well enough.As far as I know, the recommended purity is 2.8 (99.8%). A higher degree of purification can be used, but a lower degree should not be used
98% Ar + 2% N2 should be okay, because N2 is just another inert gas.
98% Ar + 2% O2 should be okay, because concentrations of O2 below 6% are lethal and cause fainting quickly. [1]
98.5% Ar + 1.5% CO2 can be slightly worse but still okay, because concentrations of CO2 at 15000 - 20000 ppm cause mild effects during short periods of time [2], and you can hyperventilate to negate these effects.
[1]
NIOSH Publication No. 2005-100 Respirator Selection Logic 2004 Chapter V. Additional Information on Hazards and Exposures
The purpose of this Respirator Selection Logic (RSL) is to provide guidance to respirator program administrators on respirator selection that incorporates the changes necessitated by the revisions to the respirator use and certification regulations and...
niosh.dnacih.com
[2]
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