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MSDS Material Safety Data Sheet
CAS

74-82-8

File Name: avogadro_chem_iastate_edu---methane.asp
                    MATERIAL SAFETY DATA SHEET
SECTION 1. PRODUCT IDENTIFICATION
PRODUCT NAME: Methane FORMULA: CH4
CHEMICAL NAME: Methane, Saturated Alphatic Hydrocarbon, Alkane
SYNONYMS: Methyl Hydride, Marsh Gas, Fire Damp
MANUFACTURER: Air Products and Chemicals, Inc.
7201 Hamilton Boulevard
Allentown, PA 18195 - 1501
PRODUCT INFORMATION : (800) 752-1597
MSDS NUMBER: 1070 REVISION: 6
REVIEW DATE: July 1999 REVISION DATE: July 1999

SECTION 2. COMPOSITION / INFORMATION ON INGREDIENTS
Methane is packaged as pure product (>99%).
CAS NUMBER: 74-82-8
EXPOSURE LIMITS:
OSHA: None established ACGIH: Simple Asphyxiant NIOSH: None established

SECTION 3. HAZARD IDENTIFICATION

EMERGENCY OVERVIEW
Methane is a flammable, colorless, odorless, compressed gas packaged in cylinders under high
pressure. It poses an immediate fire and explosion hazard when mixed with air at concentrations
exceeding 5.0%. High concentrations that can cause rapid suffocation are within the flammable
range and should not be entered.

EMERGENCY TELEPHONE NUMBERS
800 - 523 - 9374 in Continental U.S. , Canada and Puerto Rico
610 - 481 - 7711 outside U.S.

ACUTE POTENTIAL HEALTH EFFECTS:
ROUTES OF EXPOSURE:
EYE CONTACT: No harmful affect.
INGESTION: Not applicable
INHALATION: Methane is nontoxic. It can, however, reduce the amount of oxygen in the air
necessary to support life. Exposure to oxygen-deficient atmospheres (less than 19.5 %) may
produce dizziness, nausea, vomiting, loss of consciousness, and death. At very low oxygen
concentrations (less than 12 %) unconsciousness and death may occur without warning. It should
be noted that before suffocation could occur, the lower flammable limit for Methane in air will be
exceeded; causing both an oxygen deficient and an explosive atmosphere.
SKIN CONTACT: No harmful affect.
POTENTIAL HEALTH EFFECTS OF REPEATED EXPOSURE:
ROUTE OF ENTRY: None
SYMPTOMS: None




MSDS # 1070 Methane Page 1 of 5
Pub # 320-732
TARGET ORGANS: None
MEDICAL CONDITIONS AGGRAVATED BY OVEREXPOSURE: None
CARCINOGENICITY: Methane is not listed as a carcinogen or potential carcinogen by NTP, IARC, or
OSHA Subpart Z.
SECTION 4. FIRST AID MEASURES

EYE CONTACT: No treatment necessary.
INGESTION: Not applicable
INHALATION: Remove person to fresh air. If not breathing, administer artificial respiration. If
breathing is difficult, administer oxygen. Obtain prompt medical attention.
SKIN CONTACT: No treatment necessary.
NOTES TO PHYSICIAN: Treatment of overexposure should be directed at the control of symptoms and
the clinical condition.

SECTION 5. FIRE FIGHTING MEASURES
FLASH POINT: AUTOIGNITION: FLAMMABLE RANGE:
-306 掳F (-187.8 掳C) 999 掳F (537 掳C) 5.0% - 15%
EXTINGUISHING MEDIA: Dry chemical, carbon dioxide, or water.
SPECIAL FIRE FIGHTING INSTRUCTIONS: Evacuate all personnel from area. If possible, without risk,
shut off source of methane, then fight fire according to types of materials burning. Extinguish fire only
if gas flow can be stopped. This will avoid possible accumulation and re-ignition of a flammable gas
mixture. Keep adjacent cylinders cool by spraying with large amounts of water until the fire burns itself
out. Self-contained breathing apparatus (SCBA) may be required.
UNUSUAL FIRE AND EXPLOSION HAZARDS: Most cylinders are designed to vent contents when
exposed to elevated temperatures. Pressure in a cylinder can build up due to heat and it may rupture
if pressure relief devices should fail to function.
HAZARDOUS COMBUSTION PRODUCTS: Carbon monoxide

SECTION 6. ACCIDENTAL RELEASE MEASURES
STEPS TO BE TAKEN IF MATERIAL IS RELEASED OR SPILLED: Evacuate immediate area.
Eliminate any possible sources of ignition, and provide maximum explosion-proof ventilation. Use a
flammable gas meter (explosimeter) calibrated for Methane to monitor concentration. Never enter an
area where Methane concentration is greater than 1.0% (which is 20% of the lower flammable limit).
An immediate fire and explosion hazard exists when atmospheric Methane concentration exceeds
5.0%. Use appropriate protective equipment (SCBA and fire resistant suit). Shut off source of leak if
possible. Isolate any leaking cylinder. If leak is from container, pressure relief device or its valve,
contact your supplier. If the leak is in the user鈥檚 system, close the cylinder valve, safely vent the
pressure, and purge with an inert gas before attempting repairs.

SECTION 7. STORAGE AND HANDLING
STORAGE: Store cylinders in a well-ventilated, secure area, protected from the weather. Cylinders
should be stored upright with valve outlet seals and valve protection caps in place. There should be
no sources of ignition. All electrical equipment should be explosion-proof in the storage areas.
Storage areas must meet National Electrical Codes for class 1 hazardous areas. Flammable storage
areas must be separated from oxygen and other oxidizers by a minimum distance of 20 ft. or by a
barrier of non-combustible material at least 5 ft. high having a fire resistance rating of at least _ hour.
Post 鈥淣o Smoking or Open Flames鈥? signs in the storage or use areas. Do not allow storage temperature
to exceed 125 掳F (52 掳C). Storage should be away from heavily traveled areas and emergency exits.
Full and empty cylinders should be segregated. Use a first-in first-out inventory system to prevent full
containers from being stored for long periods of time.
HANDLING: Do not drag, roll, slide or drop cylinder. Use a suitable hand truck designed for cylinder
movement. Never attempt to lift a cylinder by its cap. Secure cylinders at all times while in use. Use
a pressure reducing regulator to safely discharge gas from cylinder. Use a check valve to prevent
reverse flow




MSDS # 1070 Methane Page 2 of 5
Pub # 320-732
into cylinder. Never apply flame or localized heat directly to any part of the cylinder. Do not allow
any part of the cylinder to exceed 125 掳F (52 掳C). Use piping and equipment adequately designed to
withstand pressures to be encountered. Once cylinder has been connected to properly purged and
inerted process, open cylinder valve slowly and carefully. If user experiences any difficulty operating
cylinder valve, discontinue use and contact supplier. Never insert an object (e.g., wrench, screwdriver,
etc.) into valve cap openings. Doing so may damage valve causing a leak to occur. Use an adjustable
strap-wrench to remove over-tight or rusted caps. All piped systems and associated equipment must be
grounded. Electrical equipment should be non-sparking or explosion-proof.
SPECIAL PRECAUTIONS: Always store and handle compressed gas cylinders in accordance with
Compressed Gas Association, Inc. (telephone 703-412-0900) pamphlet CGA P-1, Safe Handling of
Compressed Gases in Containers. Local regulations may require specific equipment for storage or use.

SECTION 8. EXPOSURE CONTROLS/PERSONAL PROTECTION
ENGINEERING CONTROLS:
VENTILATION: Provide adequate natural or explosion-proof ventilation to prevent
accumulation of gas concentrations above 1.0% Methane (20% of LEL).
RESPIRATORY PROTECTION:
Emergency Use: Do not enter areas where Methane concentration is greater than 1.0% (20%
of the LEL). Exposure to concentrations below 1.0% do not require respiratory protection.
EYE PROTECTION: Safety glasses and/or face shield.
SKIN PROTECTION: Leather gloves for handling cylinders. Fire resistant suit and gloves in emergency
situations.
OTHER PROTECTIVE EQUIPMENT: Safety shoes are recommended when handling cylinders.

SECTION 9. PHYSICAL AND CHEMICAL PROPERTIES
APPEARANCE, ODOR AND STATE: Colorless, odorless, flammable gas.
MOLECULAR WEIGHT: 16.04
BOILING POINT (1 atm): -258.7 掳F (-161.5 掳C)
SPECIFIC GRAVITY (Air = 1): 0.554
FREEZING POINT / MELTING POINT: -296. 5 掳F (-182.5 掳C)
VAPOR PRESSURE (At 70 F (21.1 C)): Permanent, noncondensable gas.
GAS DENSITY (At 70 F (21.1 C) and 1 atm): 0.042 lb/ft 3
SOLUBILITY IN WATER (vol/vol): 3.3 ml gas / 100 ml

SECTION 10. STABILITY AND REACTIVITY
CHEMICAL STABILITY: Stable
CONDITIONS TO AVOID: Cylinders should not be exposed to temperatures in excess of 125 掳F (52 掳C).
INCOMPATIBILITY (Materials to Avoid): Oxygen, Halogens and Oxidizers
REACTIVITY:
A) HAZARDOUS DECOMPOSITION PRODUCTS: None
B) HAZARDOUS POLYMERIZATION: Will not occur

SECTION 11. TOXICOLOGICAL INFORMATION
LC50 (Inhalation): Not applicable. Simple asphyxiant.
LD50 (Oral): Not applicable
LD50 (Dermal): Not applicable
SKIN CORROSIVITY: Methane is not corrosive to the skin.
ADDITIONAL NOTES: None




MSDS # 1070 Methane Page 3 of 5
Pub # 320-732
SECTION 12. ECOLOGICAL INFORMATION
AQUATIC TOXICITY: Not determined
MOBILITY: Not determined
PERSISTENCE AND BIODEGRADABILITY: Not determined
POTENTIAL TO BIOACCUMULATE: Not determined
REMARKS: This product does not contain any Class I or Class II ozone depleting chemicals.

SECTION 13. DISPOSAL CONSIDERATIONS
UNUSED PRODUCT / EMPTY CONTAINER: Return container and unused product to supplier. Do not
attempt to dispose of residual or unused quantities.
DISPOSAL INFORMATION: Residual product in the system may be burned if a suitable burning unit
(flair incinerator) is available on site. This shall be done in accordance with federal, state, and local
regulations. Wastes containing this material may be classified by EPA as hazardous waste by
characteristic (i.e., Ignitability, Corrosivity, Toxicity, Reactivity). Waste streams must be characterized
by the user to meet federal, state, and local requirements.

SECTION 14. TRANSPORT INFORMATION
DOT SHIPPING NAME: Methane, compressed
HAZARD CLASS: 2.1
IDENTIFICATION NUMBER: UN1971
SHIPPING LABEL(s): Flammable gas
PLACARD (When required): Flammable gas
SPECIAL SHIPPING INFORMATION: Cylinders should be transported in a secure upright position in a
well-ventilated truck. Never transport in passenger compartment of a vehicle. Ensure cylinder valve is
properly closed, valve outlet cap has been reinstalled, and valve protection cap is secured before
shipping cylinder.
CAUTION: Compressed gas cylinders shall not be refilled except by qualified producers of compressed
gases. Shipment of a compressed gas cylinder which has not been filled by the owner or with the owner鈥檚
written consent is a violation of Federal law (49 CFR 173.301).
NORTH AMERICAN EMERGENCY RESPONSE GUIDEBOOK NUMBER (NAERG #): 115

SECTION 15. REGULATORY INFORMATION
U.S. FEDERAL REGULATIONS:
EPA - ENVIRONMENTAL PROTECTION AGENCY
CERCLA: Comprehensive Environmental Response, Compensation, and Liability Act of 1980
(40 CFR Parts 117 and 302)
Reportable Quantity (RQ): None
SARA TITLE III: Superfund Amendment and Reauthorization Act
SECTIONS 302/304: Emergency Planning and Notification (40 CFR Part 355)
Extremely Hazardous Substances: Methane is not listed.
Threshold Planning Quantity (TPQ): None
Reportable Quantity (RQ): None
SECTIONS 311/312: Hazardous Chemical Reporting (40 CFR Part 370)
IMMEDIATE HEALTH: Yes PRESSURE: Yes
DELAYED HEALTH: No REACTIVITY: No
FIRE: Yes
SECTION 313: Toxic Chemical Release Reporting (40 CFR Part 372)
Methane does not require reporting under Section 313.




MSDS # 1070 Methane Page 4 of 5
Pub # 320-732
CLEAN AIR ACT:
SECTION 112 (r): Risk Management Programs for Chemical Accidental Release
(40 CFR PART 68)
Methane is listed as a regulated substance.
Threshold Planning Quantity (TPQ): 10,000 lbs
TSCA: Toxic Substance Control Act
Methane is listed on the TSCA inventory.
OSHA - OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION:
29 CFR Part 1910.119: Process Safety Management of Highly Hazardous Chemicals
Methane is not listed in Appendix A as a highly hazardous chemical. However, any
process that involves a flammable gas on site in one location, in quantities of 10,000
pounds
(4,553 kg) or greater is covered under this regulation unless it is used as fuel.
STATE REGULATIONS:
CALIFORNIA:
Proposition 65: This product is not a listed substance which the State of California
requires warning under this statute.

SECTION 16. OTHER INFORMATION
NFPA RATINGS: HMIS RATINGS:
HEALTH: = 1 HEALTH: =0
FLAMMABILITY: = 4 FLAMMABILITY: =4
REACTIVITY: = 0 REACTIVITY: =0
SPECIAL: = SA*

*SA denotes 鈥淪imple Asphyxiant鈥? per Compressed Gas Association recommendation.




MSDS # 1070 Methane Page 5 of 5
Pub # 320-732

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