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Product Name:
MSDS No.:
Date: Oct. 15, 2010
Praxair Material Safety Data Sheet
1. Chemical Product and Company Identification
Product Name: Oxygen
Trade Name:
Product Use:
Chemical Name:
Synonym:
Chemical Formula: O2
Chemical Family: Permanent Gas.
Telephone:
Emergencies: * 1-800-363-0042
Supplier
/Manufacture:
1 City Centre DriveSuite 1200Mississauga, ON L5B 1M2 *Call emergency numbers 24 hours a day only for spills, leaks, fire, exposure, or accidents involving thisproduct. For routine information, contact your supplier or Praxair sales representative. 2. Hazards Identification
Emergency Overview
WARNING!
High pressure, oxidizing gas. Vigorously accelerates combustion. Self-contained breathing
apparatus may be required by rescue workers.

ROUTES OF EXPOSURE:
THRESHOLD LIMIT VALUE: TLV-TWA Data from 2007 Guide to Occupational Exposure Values (ACGIH). TLV-TWAs
should be used as a guide in the control of health hazards and not as fine lines between safe and dangerous
concentrations.
EFFECTS OF A SINGLE (ACUTE) OVEREXPOSURE:
INHALATION:
Breathing 80% or more oxygen at atmospheric pressure for more than a few hours maycause nasal stuffiness, cough, sore throat, chest pain and breathing difficulty. Breathingoxygen at higher pressure increases the likelihood of adverse effects within a shorter timeperiod. Breathing pure oxygen under pressure may cause lung damage and also centralnervous system effects resulting in dizziness, poor coordination, tingling sensation, visual andhearing disturbances, muscular twitching, unconsciousness and convulsions. Breathing ofoxygen under pressure may cause prolongation of adaptation to darkness and reducedperipheral vision.
SKIN CONTACT:
SKIN ABSORPTION:
No evidence of adverse effects from available information.
SWALLOWING:
This product is a gas at normal temperature and pressure.
EYE CONTACT:
No evidence of adverse effects from available information.
Copyright 2005, Praxair Canada Inc.
Page 1 of 8
EFFECTS OF REPEATED (CHRONIC) OVEREXPOSURE:
No evidence of adverse effects from available information.
OTHER EFFECTS OF OVEREXPOSURE:
See "Notes to Physician", in the "First Aid" section.
MEDICAL CONDITIONS AGGRAVATED BY OVEREXPOSURE:
See "Notes to Physician", in the "First Aid" section.
SIGNIFICANT LABORATORY DATA WITH POSSIBLE RELEVANCE TO HUMAN HEALTH HAZARD EVALUATION:
CARCINOGENICITY:
Not listed as carcinogen by OSHA, NTP or IARC.
3. Composition and Information on Ingredients
COMPONENTS
CONCENTRATION
4. First Aid Measures
INHALATION:
If inhaled, remove to fresh air. If not breathing, give artificial respiration. Keep patient warm and at rest. Get medicalattention. Advise the physician that the victim has been exposed to high concentration of oxygen.
SKIN CONTACT:
SWALLOWING:
This product is a gas at normal temperature and pressure.
EYE CONTACT:
NOTES TO PHYSICIAN:
Supportive treatment should include immediate sedation, anti-convulsive therapy if needed, and rest. Animal studiessuggest that the administration of certain drugs, including phenothiazine drugs and chloroquine, increase thesusceptibility to toxicity from oxygen at high concentrations or pressures. Animal studies also indicate that vitamin Edeficiency may increase susceptibility to oxygen toxicity. Airway obstruction during high oxygen tension may causealveolar collapse following absorption of the oxygen. Similarly, occlusion of the eustachian tubes may cause retraction ofthe eardrum and obstruction of the paranasal sinuses may produce “vacuum-type” headache. Newborn prematureinfants exposed to high oxygen concentrations may suffer delayed retinal damage, which can progress, to retinaldetachment and blindness (retrolental fibroplasia). Retinal damage can also occur in adults exposed to 100% oxygenunder greater that atmospheric pressure, particularly in individuals whose retinal circulation has been previouslycompromised. All individuals exposed for only periods to oxygen at high pressure and all that exhibit overt oxygen toxicity should haveophthalmologic examination. 5. Fire Fighting Measures
FLAMMABLE :
IF YES, UNDER WHAT CONDITIONS?
V i g o r o u s l y a c c e l e r a t e scombustion.
EXTINGUISHING MEDIA:
Vigorously accelerates combustion. Use media appropriate for surrounding fire. Water (i.e., safety shower) is thepreferred extinguishing media for clothing fires.
PRODUCTS OF COMBUSTION:
Copyright 2005, Praxair Canada Inc.
Page 2 of 8
PROTECTION OF FIREFIGHTERS:
WARNING! Evacuate all personnel from danger area. Immediately deluge cylinders with water from maximum distance
until cool; then move them away from fire area if without risk.
SPECIFIC PHYSICAL AND CHEMICAL HAZARDS:
Oxidizing agent, vigorously accelerates combustion. Contact with flammable materials may cause fire or explosion.
Container may rupture due to heat of fire. Vapours are extremely irritating. Contact may cause burns to skin and eyes.
No part of a container should be subjected to a temperature higher than 52 C. See incompatibility in Section 10. Mostcontainers are provided with a pressure relief divice designed to vent contents when they are exposed to elevatedtemperature. Smoking, flames and electrric sparks in the presence of enriched oxygen atmospheres are potentialexplosion hazards.
SENSITIVITY TO IMPACT:
SENSITIVITY TO STATIC DISCHARGE:
PROTECTIVE EQUIPMENT AND PRECAUTIONS FOR FIREFIGHTERS:
Firefighters should wear self-contained breathing apparatus and full fire-fighting turnout gear.
FLAMMABLE LIMITS IN AIR, % by volume:
FLASH POINT:
AUTOIGNITION TEMPERATURE:
6. Accidental Release Measures
STEPS TO BE TAKEN IF MATERIAL IS RELEASED OR SPILLED:
Personal Precautions:
WARNING!
Shut off flow if you can do so without risk. Ventilate area or move cylinder to a well-ventilated area.
Remove all flammable materials from vicinity. Oxygen must never be permitted to strike an oily surface,greasy clothes, or other combustible material.
Environmental Precautions:
Discard any product, residue, disposable container, or liner in an environmentally acceptable manner, in full compliancewith federal, provincial, and local regulations. If necessary call your local supplier.
7. Handling and Storage
PRECAUTIONS TO BE TAKEN IN HANDLING:
Use piping and equipment adequately designed to withstand pressures to be encountered. Ground all equipment.
Store and use with adequate ventilation at all times. Use only in a closed system constructed of corrosion resistantmaterials. NOTE: Reverse flow into cylinder may cause rupture. Use a check valve or other protective apparatus inany lines or piping from the cylinder to prevent reverse flow. For additional information refer to CGA pamphlet P-1. (Seesection 16 for more details).
WHEN USED IN WELDING AND CUTTING: Read and understand the namufacturer's instructions and theprecautionary label on the product. See American Standard Z49.1 "Safety in Welding and Cutting" published by theAmerican Welding Society, P.O. Box 351040, Miami, Florida, 33135.
Note: Suitability for use as a component in underwater breathing gas mixtures is to be determined by or under the Copyright 2005, Praxair Canada Inc.
Page 3 of 8
supervision of personnel experienced in the use of underwater breathing gas mixtures. Become familiar with theeffects, methods, frequency and duration of use, hazards, side effects and precautions to be taken.
PRECAUTIONS TO BE TAKEN IN STORAGE:
Store and use with adequate ventilation. Separate flammable cylinders from oxygen, chlorine, and other oxidizers by atleast 6 m or use a barricade of non-combustible material. This barricade should be at least 1.5 m high and have a fireresistance rating of at least ½ hour. Firmly secure cylinders upright to keep them from falling or being knocked over.
Screw valve protection cap firmly in place by hand. Post “No Smoking or Open Flames” signs in storage and use areas.
There must be no sources of ignition. All electrical equipment in storage areas must be explosion-proof. Storage areasmust meet national electric codes for Class 1 hazardous areas. Store only where temperature will not exceed 52 C.
Store full and empty cylinders separately. Use a first-in, first-out inventory system to prevent storing full cylinders forlong periods. For additional information refer to CGA pamphlet P-2305(for welding and cutting). See section 16.
OTHER HAZARDOUS CONDITIONS OF HANDLING, STORAGE, AND USE:
High-pressure, oxidizing gas. Use piping and equipment adequately designed to withstand pressures to be
encountered. Vigorously accelerates combustion. Keep oil, grease, and combustibles away. Store and use with
adequate ventilation at all times.
Close valve after each use; keep closed even when empty. Prevent reverse flow.
Reverse flow into cylinder may cause rupture. Use a check valve or other protective device in any line or piping from the
cylinder. When returning cylinder to supplier, be sure valve is closed, then install valve outlet plug tightly. Never work
on a pressurized system.
If there is a leak, close the cylinder valve. Vent the system down in a safe and
environmentally sound manner in compliance with all federal, provincial, and local laws; then repair the leak. Never
place a compressed gas cylinder where it may become part of an electrical circuit.

RECOMMENDED PUBLICATIONS:
Additional information on storage, handling, and use of this product is provided in NFPA 55: Standard for the Storage,
Use, and Handling of Compressed and Liquefied Gases in Portable Cylinders
, published by the National Fire
Protection Association.
See also Praxair publication P-14-153, Guidelines for Handling Gas Cylinders and Containers. Obtain from your localsupplier.
8. Exposure Controls/Personal Protection
INGREDIENTS
CAS NUMBER
Exposure Limits
(Species &
THRESHOLD LIMIT VALUE: TLV-TWA Data from 2007 Guide to Occupational Exposure Values (ACGIH). TLV-TWAs
should be used as a guide in the control of health hazards and not as fine lines between safe and dangerous
concentrations.
IMMEDIATELY DANGEROUS TO LIFE AND HEALTH (IDLH):
VENTILATION/ENGINEERING CONTROLS:
LOCAL EXHAUST: Use a local exhaust system, if necessary, to prevent increased oxygen
concentration and, in welding, to keep hazardous fumes and gases belowapplicable TLVs in the worker's breathing zone.
MECHANICAL (General): General exhaust ventilation may be acceptable if it can maintain a
supply of air that is not too rich in oxygen an, during welding, cankeep hazardous fumes and gases below the applicable TLVs inthe worker's breathing zone.
SPECIAL: None.
Copyright 2005, Praxair Canada Inc.
Page 4 of 8
OTHER: None.
PERSONAL PROTECTION:
RESPIRATORY PROTECTION: None required under normal use. However, air-supplied
respirators are required while working in confined spaces with thisproduct. For welding, use air-purifying or air-supplied respirators,as appropriate, where local or general exhaust ventilation isinadequate. Adequate ventilation must keep worker exposurebelow applicable TLVs for fumes, gases and other by-products ofwelding with oxygen. Selection should be based on the currentCSA standard Z94.4 “Selection, Care, and Use of Respirators”.
Respirators should be approved by NIOSH and MSHA.
SKIN PROTECTION: Wear work gloves when handling cylinders.
EYE PROTECTION: Wear safety glasses when handling cylinders.
Select in accordance with the current CSA standard Z94.3,"Industrial Eye and Face Protection", and any provincialregulations, local bylaws or guidelines.
OTHER PROTECTIVE EQUIPMENT: Metatarsal shoes for cylinder handling. Protective clothing where
needed. Cuffless trousers should be worn outside the shoes.
Select in accordance with the current CSA standard Z195,"Protective Foot Wear", and any provincial regulations, localbylaws or guidelines.
9. Physical and Chemical Properties
PHYSICAL STATE:
FREEZING POINT:
BOILING POINT
MOLECULAR WEIGHT:
PRESSURE
SPECIFIC
SOLUBILITY IN
GRAVITY:
SPECIFIC
EVAPORATION
COEFFICIENT OF
GRAVITY:
WATER/OIL
DISTRIBUTION:
VAPOUR DENSITY:
% VOLATILES BY
ODOUR THRESHOLD:
APPEARANCE & ODOUR: Colourless.
10. Stability and Reactivity
STABILITY:
CONDITIONS OF CHEMICAL INSTABILITY:
C o m p a t i b i l i t y w i t h p l a s t i c s s h o u l d b econfirmed prior to use.
INCOMPATIBILITY (materials to avoid):
Combustible materials, asphalt, flammablematerials, especially oils and greases.
Oxygen reacts with many materials.
HAZARDOUS DECOMPOSITION PRODUCTS:
HAZARDOUS POLYMERIZATION:
Copyright 2005, Praxair Canada Inc.
Page 5 of 8
CONDITIONS TO AVOID:
CONDITIONS OF REACTIVITY:
11. Toxicological Information
ACUTE DOSE EFFECTS: The welding process may generate hazardous fumes and gases. See Sections 10 and 16
STUDY RESULTS:
At atmospheric concentration and pressure, oxygen poses no toxicity hazards. At high concentrations, newbornpremature infants may suffer delayed retinal damage (retrolental fibroplasia) that can progress to retinal detachment andblindness. Retinal damage may also occur in adults exposed to 100% oxygen for extended periods (24 to 48 hours) or atgreater than atmospheric pressure, particularly in individuals whose retinal circulation has been previously compromised.
All individuals exposed for long periods to oxygen at high pressure and all who exhibit overt oxygen toxicity should haveophthalmologic examinations.
At two or more atmospheres, toxicity to the Central Nervous System (CNS) occurs. Symptoms include nausea, vomiting,dizziness or vertigo, muscle twitching, vision changes, and loss of consciousness and generalized seizures. At threeatmospheres, CNS toxicity occurs in less than two hours; at six atmospheres, in only a few minutes.
Patients with chronic obstructive pulmonary disease retain carbon dioxide abnormally. If oxygen is administered, raisingtheir blood oxygen concentration, their breathing becomes depressed and retained carbon dioxide rises to a dangerouslevel.
Animal studies suggest that the administration of certain drugs, including phenothiazine drugs and chloroquine, increasesthe susceptibility to toxicity from oxygen at high concentrations or pressures. Animal studies also indicate that vitamin Edeficiency 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 eustachians tubes may cause retraction of the eardrum and obstruction of the paranasal sinuses mayproduce vacuum-type headache.
12. Ecological Information
No adverse ecological effects expected. This product does not contain any Class I or Class II ozone-depleting chemicals.
The components of this mixture are not listed as marine pollutants by TDG Regulations.
13. Disposal Considerations
WASTE DISPOSAL METHOD:
Do not attempt to dispose of residual or unused quantities. Return cylinder tosupplier.
14. Transport Information
TDG/IMO SHIPPING NAME:
HAZARD CLASS:
IDENTIFICATION #:
PRODUCT RQ:
Copyright 2005, Praxair Canada Inc.
Page 6 of 8
SHIPPING LABEL(s):
Special/Oxidizer with Class 2 at bottom.
PLACARD (When Required):
Special/Oxidizer with Class 2 at bottom.
SPECIAL SHIPPING INFORMATION:
Cylinders should be transported in a secure position, in a well-ventilated vehicle. Cylinders transported in an enclosed,nonventilated compartment of vehicle can present serious safety hazards.
15. Regulatory Information
The following selected regulatory requirements may apply to this product. Not all such requirements are identified. Users of thisproduct are solely responsible for compliance with all applicable federal, provincial, and local regulations. This product has beenclassified in accordance with the hazard criteria of the CPR and the MSDS contains all the information required by the CPR.
WHMIS (Canada):
CLASS A: Compressed gas.
CLASS C: Oxidizing material.
International Regulations:
DSCL (EEC):
R8- Contact with combustible material may cause fire.
International Lists:
16. Other Information
MIXTURES:
When two or more gases, or liquefied gases are mixed, their hazardous properties may combine to create additional,unexpected hazards. Obtain and evaluate the safety information for each component before you produce the mixture.
Consult an Industrial Hygienist, or other trained person when you make your safety evaluation of the end product.
Remember, gases and liquids have properties which can cause serious injury or death.
HAZARD RATING SYSTEM:
HMIS RATINGS:
FLAMMABILITY 0
PHYSICAL HAZARD 2
STANDARD VALVE CONNECTIONS FOR U.S. AND CANADA:
THREADED:
0-3000 psig CGA-5403001-4000 CGA-5774001-5500 CGA-701 PIN-INDEXED YOKE:
ULTRA-HIGH-INTEGRITY
CONNECTION:
Use the proper CGA connections. DO NOT USE ADAPTERS. Additional limited-standard connections may apply.
See CGA pamphlets V-1 and V-7 listed below.
Ask your supplier about free Praxair safety literature as referred to in this MSDS and on the label for this product. Furtherinformation about this product can be found in the following pamphlets published by the Compressed Gas Association,Inc. (CGA), 4221 Walney Road, 5th Floor, Chantilly, VA 20151-2923, Telephone (703) 788-2700, Fax (703) 961-1831,website: www.cganet.com.
Copyright 2005, Praxair Canada Inc.
Page 7 of 8
Safe Handling and Storage of Compressed Gases Characteristics and Safe Handling of Cryogenic Liquid and Gaseous Oxygen Safe Handling of Compressed Gases in Containers Characteristics and Safe Handling of Medical Gases Accident Prevention in Oxygen-Rich, Oxygen-Deficient Atmospheres Use of Oxy-Fuel Gas Welding and Cutting Apparatus Compressed Gas Cylinder Valve Inlet and Outlet Connections Handbook of Compressed Gases, Fourth Edition Praxair asks users of this product to study this MSDS and become aware of product hazards and safety information. Topromote safe use of this product, a user should (1) notify employees, agents, and contractors of the information in thisMSDS and of any other known product hazards and safety information, (2) furnish this information to each purchaser ofthe product, and (3) ask each purchaser to notify its employees and customers of the product hazards and safetyinformation.
PREPARATION INFORMATION:
October 15, 2010
DEPARTMENT:
Safety and Environmental Services
TELEPHONE:
905-803-1600
The opinions expressed herein are those of qualified experts within Praxair Canada Inc. We believe that the informationcontained herein is current as of the date of this Material Safety Data Sheet. Since the use of this information and theconditions of use of the product are not within the control of Praxair Canada Inc., it is the user's obligation to determine theconditions of safe use of the product.
Praxair Canada Inc. requests the users of this product to study this Material Data Sheet (MSDS) and become aware ofproduct hazards and safety information. To promote safe use of this product, a user should (1) notify its employees,agents and contractors of the information on this MSDS and any product hazards and safety nformation, (2) furnish thissame information to each of its customers for the product, and (3) request such customers to notify their employees andcustomers for the product of the same product hazards and safety information.
Praxair and the Flowing Airstream design are trademarks of Other trademarks used herein are trademarks or registered trademarks of their respective owners.
Praxair Canada Inc.
1 City Centre DriveSuite 1200Mississauga, ON L5B 1M2 Copyright 2007, Praxair Technology, Inc.
Copyright 2005, Praxair Canada Inc.
Page 8 of 8

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