NITROGEN 

Research Grade 5.5
Minimum Purity 99.9995%

Oxygen (O2) <  0.5 ppm
Sum of:
Carbon Dioxide (CO2) 
Carbon Monoxide (CO) < 1 ppm
Moisture (H2O) < 1 ppm
Total Hydrocarbons < 0.2 ppm

Ultra High Purity Grade 5.0
Minimum Purity 99.999%

Oxygen (O2) <  1 ppm
Moisture (H2O) < 1 ppm
Total Hydrocarbons < 0.5 ppm

Up to 305 cf

Up to 2,640 PSI

Zero Grade 4.8
Minimum Purity 99.998%

Total Hydrocarbons < 0.5 ppm