Breathing Air Specifications


This is only a partial list of the specifications that we routinely work with.


Reference    Pure Oxygen (Aviators) Modified CGAE for Nitrox Prep US Navy Post Painting of Chambers NAVSEA P-9290 Off Gas Analysis
Specification   MIL-PRF-27210-H NASA & CGA SS521-AK-HBK-010 SS800-AG-MAN-010/P-9290
 Oxygen    % > 99.5 20-22 Same as carrier SEV
 Nitrogen    - Balance N.S. SEV
 Carbon Dioxide  ppmv 10 1000 Same as carrier SEV
 Carbon Monoxide  ppmv - 2 10 10
Total Volatile Hydrocarbons (inc. Methane) ppmv 50 25 25 25
Total Volatile Hydrocarbons (less Methane)    - - - -
Halogenated Hydrocarbons (inc. Freons) ppmv 2 - 10 10
Halogenated Hydrocarbons (less. Freons) ppmv 0.2 - -  
 Oil Mist + Particulate  mg/m3 N.S. - N.S. -
 Oil Mist   mg/m3 N.S. 0.1 N.S. -
 Particulate Count/Size Range  microns N.S. Per NASA* N.S. -
 Fibers Count/Size Range  microns N.S. Per NASA* N.S. -
 Nitrogen Dioxide (NO2)  ppmv Not required
 Nitrous Oxide      (N2O)  ppmv 4 - - -
 Sulfur Dioxide  ppmv 1 - 1 1
 Dew Point per client  or colder than    - 82º F - 65º F N.S. -
 Pronounced Odor   None None None None
 Butyl Alcohol  ppmv Not required
 Isopropyl Alcohol  ppmv Not required
 Methane  ppmv 50 - 25 -
 Methyl Isobutyl Ketone  ppmv - - 100 -
 Toluene  ppmv Not required
 Acetylene   ppmv 0.1 - - -
 Ethylene  ppmv 0.4 - - -
 Ethane + Other HC   ppmv - - - -
 Other compounds (discernible from back-round noise   0.2 - - -
 Refrigerants & similar solvents   2 - - -
 Acrolein  ppmv - - 0.01 0.01
 Ammonia ppmv - - 4 10
 Benzene  ppmv - - 0.1 0.1
 Methanol ppmv - - - 7
 Butyl Cellusolve ppmv - - 2 2
 Chlorine  ppmv - - 0.1 0.1
1,2-Dichloroethylene  ppmv - - 0.1 0.1
 Formaldehyde  ppmv - - 0.1 0.04
 Hydrogen  ppmv - - 10,000 (1%) 10,000 (1%)
 Hydrogen Sulfide ppmv - - 1 1
 Mercury  mg/m3 - - (Meter) 0.01  (meter) 0.01
 Trichloroethane / methyl Chloroform  ppmv - - 2.5 2.5
 Trichloroethylene ppmv - - 0.1 0.1
 Vinylidene Chloride ppmv - - 0.15 0.15
 Xylene(s)  ppmv - - 10 10


Reference  US NAVY Diver’s  Air NFPA Fire & Resp. Protection CGA Grade D CGA Grade E CGA Grade J
 Specification   SS521-AG-PRO-010 1989, 2008 Ed G-7.1 G-7.1 G-7.1
 Oxygen    % 20 - 22 19.5 - 23.5 19.5 - 23.5 20 –22 19.5 – 23.5
 Nitrogen  75 – 81% Balance Balance
 Carbon Dioxide  ppmv 1000 1000 1000 1000 0.5
 Carbon Monoxide  ppmv 20 5 10 10 1
Total Volatile Hydrocarbons (inc. Methane) ppmv 25 25 - 25 25
Total Volatile Hydrocarbons (less Methane)  ppmv - 25 - 25 -
Halogenated Hydrocarbons (inc. Freons) ppmv  - - - - 0.1
Halogenated Hydrocarbons (less. Freons) ppmv Not required
 Oil Mist + Particulate  mg/m3 5 2 5 5 -
 Oil Mist   mg/m3 - 2 - - -
 Particulate Count/Size Range  microns Not required
 Fibers Count/Size Range  microns Not required
 Nitrogen Dioxide (NO2)  ppmv - - - - 0.1
 Nitrous Oxide      (N2O)  ppmv - - - - 0.1
 Sulfur Dioxide  ppmv - - - - 0.1
 Dew Point per client  or colder than  - 65º F (24ppmv) - 65º F (24ppmv) - 50º F (67ppmv) - - 105º F (1ppm)
 Pronounced Odor   Not objectionable  None None None None