OXYGEN 

Research Grade 5.0
Minimum Purity 99.999%

Argon (Ar) < 5 ppm
Carbon Dioxide (CO2) < 1 ppm 
Carbon Monoxide (CO) < 1 ppm
Moisture (H2O) < 1 ppm
Krypton (Kr) < 3 ppm
Nitrogen (N2) < 5 ppm
Total Hydrocarbons < 0.5 ppm

Ultra High Purity Grade 4.4
Minimum Purity 99.994%

Argon (Ar) < 35 ppm
Sum of:
Carbon Dioxide (CO2)
Carbon Monoxide (CO) < 1 ppm
Moisture (H2O) < 2 ppm
Nitrogen (N2) < 10 ppm
Total Hydrocarbons < 0.5 ppm

Up to 337 cf

Up to 2,640 PSI

Zero Grade 2.8
Minimum Purity 99.8%

Total Hydrocarbons < 0.5 ppm