UHP Oxygen grade 4.4 99.994%, which comprises 21 percent of the earth's atmosphere

Resources

Ultra-High Purity Oxygen

St. Mary's, PA
Ultra-High Purity (UHP) Oxygen

Oxygen Purity:	99.999%
Argon:	<0.1 ppm
Nitrogen:	<5.0 ppm
Hydrogen:	<2.0 ppm
Water Vapor:	<2.0 ppm
Total Hydrocarbons:	<1.0 ppm
Krypton, CO2, CO:	Trace Amounts

Kalama, WA
Mega-High Purity (MHP) Oxygen

Oxygen Purity:	99.9999%
Nitrogen:	<100 ppb
Hydrogen:	<500 ppb
Water Vapor:	<100 ppb
All Other Impurities:	<300 ppb

Properties:	U.S. Units	Metric Units
Molecular Weight:	31.99	31.99
Density of the Gas @ 70 °F, 1 atm:	0.08279 lb/cu ft	1.326 kg/ m3
Specific Gravity of the Gas @ 70 °F, 1 atm:	1.01049	1.01049
Specific Volume of the Gas:	12.08 cu ft/lb	0.7541 m3/kg
Boiling Point @ 1 atm:	- 297.3 °F	- 183.0 °C
Freezing Point @ 1 atm:	- 361.1 °F	- 218.4 °C
Critical Temperature:	- 181.4 °F	- 118.6 °C
Critical Pressure:	731.4 psia	5043 kPa, abs
Critical Density:	27.23 lb/cu ft	436.18 kg/m3
Triple Point:	- 361.8 °F @ 0.022 psia	- 218.8 °C @ 0.1517 kPa, abs
Liquid/Gas Volumetric Ratio:	1.0/860.6	1.0/860.6

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