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OXYGEN MSDS
Chemical Name:
Liquid Oxygen
Formula:

O2

Chemical Family: Oxidizer
Use:
Welding, Medical
Synonyms:
Oxygen USP, Aviators Breathing Oxygen (ABO)

NFPA Fire: 0 HMIS Fire:
0 Acute:
No

NFPA Health: 3 HMIS Health:
3 Chronic:
No

NFPA Reactivity: 0 HMIS Reactivity:
0 Fire:
Yes

NFPA Special Hazard: SA Mixture:
No Reactive:
No

Sudden Release Pressure:
Yes
02. INGREDIENTS - COMPOSITION & INFORMATION

PERCENT EXPOSURE GUIDELINES
COMPONENT CAS No. (BY WT.) OSHA - TWA ACGIH - STEL

Oxygen

7782-44-7

99.0% 100.0% None. Simple Asphyxiant
LD50: None. LC50: None.
03. HAZARDS IDENTIFICATION

EMERGENCY OVERVIEW:

Warning:
Extremely cold oxidizing liquid and gas under pressure.

Vigorously accelerates combustion.

Combustibles in contact with liquid oxygen may explode on ignition or impact.

Can cause severe frostbite.

Potential Health Effects Information:

Routes of Exposure:

Inhalation:
Breathing 80% or more oxygen at atmospheric pressure for more that a few hours

may cause nasal stuffiness, cough , sore throat, chest pain and breathing difficulty.

Breathing oxygen at higher pressure increases the likelihood of adverse effects

within a shorter time period. Breathing pure oxygen under pressure may cause lung

damage and also central nervous system effects resulting in dizziness, poor

coordination, tingling sensation, visual and hearing disturbances, muscular twitching,

unconsciousness and convulsion. Breathing oxygen under pressure may cause

prolongation of adaptation to darkness and reduced peripheral vision.

Eye Contact:
Tissue freezing and severe cryogenic burns of eyes.

Skin Contact:
Tissue freezing and severe cryogenic burns of skin.

Chronic Effects:
None

Medical Conditions Aggravated By
None.

Overexposure:

Other Effects Of Overexposure
See Section 11 "Toxicological Information".

Carcinogenicity:
Oxygen is not listed by NTP, OSHA, or IARC
04. FIRST AID MEASURES

Eye:
Incase of splash contamination, immediately flush eyes with plenty of water for at

least 15 minutes. See a physician, preferably an ophthalmologist, immediately.

Inhalation:
Move victim to fresh air. Call a physician. The physician should be advised that the

victim has been exposed to a high concentration of oxygen.



Rescue personnel should be aware of the extreme fire hazards associated with

oxygen-enriched atmospheres.

Skin:
Remove any clothing that may restrict circulation to frozen area. Do not rub frozen

parts as tissue damage may result. As soon as practical place the affected area in a

warm water bath which has a temperature not to exceed 105F (40C). Never use

dry heat. Remove and thoroughly air out contaminated clothing. In case of

massive exposure, remove clothing while showering with warm water. Call a

physician as soon as possible.



Frozen tissue is painless and appears waxy with a possible yellow color. It will

become swollen, painful, and prone to infection when thawed. If the frozen part of

the body has been thawed by the time medical attention has been obtained, cover

the area with dry sterile dressing with a large bulky protective covering.

Ingestion:
None.

Note To Physician:
Supportive treatment should include immediate sedation, anti-convulsive therapy if

needed, and rest. More detailed information can be found in Section 11

"Toxicological Information"
05. FIRE FIGHTING MEASURES

Flash Point:
Not applicable; Gas.

Auto ignition:
Not applicable.

Flammable Limits - Lower:
Not applicable.

Flammable Limits - Upper:
Not applicable.

Extinguishing Media:
Oxygen is nonflammable and will accelerate combustion. Use extinguishing media

appropriate for surrounding fire.

Fire Fighting Instructions:
Evacuate all personnel from the danger area. If possible, shut off flow of oxygen

which is supporting the fire. Immediately cool containers with water spray form

maximum distance. Do not direct water spray at the container vent. When cool,

move containers from fire area, if without risk. Liquid oxygen when spilled will

vaporize rapidly forming an oxygen-enriched vapor cloud. Evacuate this vapor

cloud area.

Fire And Explosion Hazards:
Oxidizing agent, vigorously accelerates combustion. Some materials which are

noncombustible in air will burn in the presence of an oxygen-enriched atmosphere

(over 23%). Oxygen may form explosive compounds when exposed to combustible

materials or oil, grease, and other hydrocarbon materials.



Liquid oxygen, when spilled, will vaporize rapidly, forming an oxygen-rich vapor

cloud. Evacuate this vapor cloud area. Visibility may be obscured in its vapor

cloud.



Upon exposure to intense heat or flame, cylinder will vent rapidly and or rupture

violently. Most cylinders are designed to vent contents when exposed to elevated

temperatures.



Pressure in a container can build up due to heat and it may rupture if pressure relief

devices should fail to function.



Contact with cold liquid or gaseous oxygen may cause frostbite.

Hazardous Combustion Products:
None known.

Sensitivity To Static Discharge:
Not applicable.

Sensitivity To Mechanical Impact:
None.
06. ACCIDENTAL RELEASE MEASURES

Steps to be taken is material is released
Evacuate all personnel from the affected area. Shut off source of Oxygen, if

or spilled:
possible without risk. Ventilate area or remove leaking containers to a well

ventilated location. Remove sources of heat, ignition and, if possible, separate

combustibles from the leak.



If possible, prevent liquid oxygen from contacting grease, oil, asphalt and other

combustibles. To increase rate of vaporization, spray large amounts of water onto

the spill from an upwind position. Avoid contact with liquid oxygen or cold gas.
07. HANDLING AND STORAGE

Storage:
Store and use with adequate ventilation. Do not store in a confined space. Post

"No Smoking or Open Flames" signs in the storage area. Cryogenic containers are

equipped with pressure relief devices to control internal pressure. Under normal

conditions these containers will periodically vent product. Some metals such as

carbon steel may become brittle at low temperatures and will easily fracture.

Prevent entrapment of liquid in closed systems or piping without pressure relief

devices.

Handling:
Never allow any unprotected part of the body to touch un-insulated pipes or vessels

which contain cryogenic fluids. The extremely cold metal will cause the flesh to

stick fast and tear when one attempts to withdraw from it.

Do not drop, tip, or roll containers on their side. If user experiences any difficulty

operating container valve discontinue use and contact supplier, Containers of liquid

oxygen should be separated from flammable gas containers by a minimum distance

of 20 ft., or by a barrier of noncombustible material at least 5 ft. high having a fire

resistance rating of 1/2 hour. For additional precautions in using liquid oxygen see

Section 16 - Other Information.
08. EXPOSURE CONTROLS - PERSONAL PROTECTION

Engineering Controls:

Ventilation:
Natural or mechanical to prevent oxygen-enriched atmospheres over 21% oxygen.

Personal Protective Equipment (PPE):

Skin Protection:

Clothing:
Cotton clothing is recommended for use to prevent static buildup. Long sleeve shirts

and trousers without cuffs.

Eye/Face Protection:
Full face shield and safety glasses are recommended.

Shoes:
Safety shoes are recommended when handling cylinders.

Gloves:
Loose fitting thermal insulated or leather gloves. Gloves must be clean and free of

oil and grease.

Respiratory Protection:
Before entering area you must check for flammable and oxygen deficient

atmospheres.

Respirator:
None required in general use.

Respirator:
Wear a Self contained breathing apparatus (SCBA) or NIOSH/MSHA-approved

(or equivalent) full-face piece airline respirator in the positive pressure mode in

oxygen deficient atmospheres (air purifying respirators will not provide protection).
09. PHYSICAL AND CHEMICAL PROPERTIES

Physical State:
Liquid gas

Color:
Pale blue

Odor:
Odorless

Molecular Weight:
32

Boiling Point:
-297.3F (-183.0C) @ 1 atm

Specific Gravity:
1.14 At 70F (21.1C) @ 1 atm, Air = 1

Freezing/Melting Point:
-361.1F (-218.4C), @ 1 atm

Vapor Pressure:
Not Applicable

Vapor Density:
.083 lb./cu ft (1.326 kg/CuM), At 70F (21.1C) @ 1 atm

Water Solubility:
.0489 Vol./Vol. At 32 F (0C)

Expansion Ratio:
1-860.5 70F (21.1C)

pH:
Not Applicable - Gas

Odor Threshold:
Not Applicable - Gas

Evaporation Rate:
Not Applicable - Gas

Coefficient Of Water/Oil Distribution:
Information not available
10. STABILITY AND REACTIVITY

Chemical Stability:
Stable.

Conditions To Avoid:
None.

Incompatibility With Other Materials:
Flammable materials, hydrocarbons such as oils and grease, asphalt, ethers, alcohols,

acids and aldehydes. Oxygen reacts with many materials. Refer to NFPA 491 M

Manual of Hazardous Chemical Reactions.

Hazardous Decomposition Products:
None.

Hazardous Polymerization:
Will not occur.
11. TOXICOLOGICAL INFORMATION

Other Studies Relevant To Material:
At atmospheric concentration and pressure, oxygen poses no toxicity hazards.



Premature infants exposed to high oxygen concentrations may suffer delayed retinal

damage which can progress to retinal detachment and blindness. Retinal damage

may also occur in adults exposed to 100% oxygen for extended periods (24 to 48

hr).



At two or more atmospheres central nervous system (CNS) toxicity occurs.

Symptoms include nausea, vomiting, dizziness or vertigo, muscle twitching, vision

changes, and loss of consciousness and generalized seizures. At three atmospheres,

CNS toxicity occurs in less than two hours, and at six atmospheres in only a few

minutes.

Additional Notes to Physician:
Animal studies suggest that the administration of certain drugs, including

phenothiazine drugs and chloroquine, increase the susceptibility to toxicity from

oxygen at high pressures. Animal studies also indicate that vitamin "E" deficiency

may increase susceptibility to oxygen toxicity.



Airway obstruction during high oxygen tension may cause alveolar collapse

following absorption of the oxygen. Similarly, occlusion of the Eustachian tubes may

cause retraction of the eardrum and obstruction of the paranasal sinuses may

produce "vacuum-type" headache.



All individuals exposed for long periods to oxygen at high pressure and who exhibit

overt oxygen toxicity should have ophthalmologic examinations.

Irritancy Of Material:
None.

Reproductive Effects:
None.

Teratogenicity:
None.

Synergistic Materials:
None.

Sensitization To Material:
None.

Mutagenicity:
None.
12. ECOLOGICAL INFORMATION

Additional Information:
The atmosphere contains approximately 21% oxygen. No adverse ecological

effects are expected. Oxygen does not contain any Class I or Class II ozone

depleting chemicals (40 CFR Part 82). Oxygen is not listed as a marine pollutant by

DOT (49 CFR Part 171).
13. DISPOSAL CONSIDERATIONS

Waste Disposal Method:
Do not attempt to dispose of residual or unused quantities. Return cylinder to

supplier.

Unserviceable cylinders should be returned to the supplier for safe and proper

disposal.

For emergency disposal, discharge slowly to the atmosphere in a well ventilated

area or outdoors.
14. TRANSPORT INFORMATION

DOT/IMO Shipping Name:
Oxygen, refrigerated liquid.

Hazard Class:
2.2 (Nonflammable gas.)

Identification Number:
UN 1073

PIN:
1073

Product RQ:
None.

Shipping Label:
Oxygen. An oxygen label may be used for domestic shipment in the United States

and Canada in place of the nonflammable and oxidizer labels, (49 CFR Part 172).

Special Shipping Information:
Cylinders should be transported in a secure position, in a well ventilated vehicle.

The transportation of compressed gas cylinders in automobiles or in closed-body

vehicles can present serious hazards and should be discouraged.

Placard (When Required):
Nonflammable Gas.

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