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HYDROGEN
Product Name:
Hydrogen, Compressed
Chemical Name:
Hydrogen
Formula:
H2 4
Chemical Family: Flammable gas 0 0
Use:
Various SA
Synonyms:
None

NFPA Fire: 4 HMIS Fire:
4 Acute:
No

NFPA Health: 0 HMIS Health:
0 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
Hydrogen 1333-74-0 99.0% 100.0% None. Simple Asphyxiant
LD50: None. LC50: None.
03. HAZARDS IDENTIFICATION

EMERGENCY OVERVIEW:

Danger:
Flammable, High Pressure Gas

Can form explosive mixtures with air

Burns with an invisible flame.

Potential Health Effects Information:

Routes of Exposure:

Inhalation:
Asphyxiant. It should be noted that before suffocation could occur, the lower

flammability limit of hydrogen in air would be exceeded; possibly causing both an

explosive and oxygen-deficient atmosphere. Exposure to moderate concentrations

may cause dizziness, headache, nausea and unconsciousness. Exposure to

atmospheres containing 8-10% or less oxygen will bring about unconsciousness

without warning, and so quickly that the individuals cannot help or protect

themselves. Lack of sufficient oxygen may cause serious injury or death.

Eye:
None.

Skin:
None.

Ingestion:
None.

Medical Conditions Aggravated By
None.

Overexposure:

Chronic Effects:
None

Carcinogenicity:
Not listed in NTP, OSHA or IARC
04. FIRST AID MEASURES

Inhalation:
Remove to fresh air. If not breathing, give artificial respiration. If breathing is

difficult, give oxygen. Get immediate medical attention.

Eye:
None.

Skin:
None.

Ingestion:
None.

Notes To Physician:
None.
05. FIRE FIGHTING MEASURES

Flash Point:
Flammable gas.

Autoignition:
565.5C (1050F)

Flammable Limits - Lower:
4%

Flammable Limits - Upper:
74%

Extinguishing Media:
CO2, dry chemical, water spray or fog for surrounding area. Do not extinguish until

hydrogen source is shut off.

Fire Fighting Instructions:
Evacuate all personnel from danger area. Immediately cool container with water

spray from maximum distance, taking care not to extinguish flames. If flames are

accidentally extinguished, explosive re-ignition may occur. Stop flow of gas if

without risk while continuing cooling water spray.

Fire And Explosion Hazards:
Burns with a pale blue, nearly invisible flame. Hydrogen is easily ignited with low

ignition energy. Hydrogen is lighter than air and can accumulate in the upper

sections of enclosed spaces. Pressure in a container can build up due to heat; and it

may rupture if pressure relief devices should fail to function.

Hazardous Combustion Products:
None.

Sensitivity To Mechanical Impact:
None.

Hazardous Combustion Products:
None.

Sensitivity To Static Discharge:
Ignitable by static electricity
06. ACCIDENTAL RELEASE MEASURES

Evacuate:
Evacuate immediate area. Eliminate any possible sources of ignition, and provide

maximum explosion-proof ventilation. Shut off source of hydrogen, if possible. If

leaking from cylinder, or valve, contact your supplier. The presence of a hydrogen

flame can be detected by approaching cautiously with an outstretched straw broom

to make the flame visible. Never enter a confined space or other area where the

concentration is greater than 10% of the lower flammable limit which is 0.4%.
07. HANDLING AND STORAGE

Storage:
Specific requirements are listed in NFPA 50A. Cylinder storage locations should be

well-protected, well-ventilated, dry, and separated from combustible materials.

Cylinders should never knowingly be allowed to reach a temperature exceeding

125F (52C). Cylinders of hydrogen should be separated from oxygen cylinders or

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. 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.



Cylinders should be stored upright with valve protection cap in place and firmly

secured to prevent falling or being knocked over. Protect cylinders from physical

damage; do not drag, roll, slide or drop. Use a suitable hand truck for cylinder

movement. Post "No Smoking or Open Flames" signs in the storage areas. There

should be no sources of ignition. All electrical equipment should be explosion proof

in the storage and use areas. Storage areas must meet national electric codes for

class 1 hazardous areas.

Handling:
Do not "crack" hydrogen cylinder valve before connecting it, since self-ignition may

occur. Hydrogen is the lightest gas known and may collect in the top of buildings

with out proper ventilation. It may leak out of a system which is gas-tight for air or

other gases. Leak check system with leak detection solution, never with flame. If

user experiences difficulty operating cylinder valve, discontinue use and contact

supplier. Never insert an object (e.g., wrench, screwdriver, pry bar, 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. Never strike an arc on

a compressed gas cylinder or make a cylinder a part of an electrical circuit.

Non-sparking tools should be used. For additional precautions in using hydrogen see

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

Engineering Controls:

Ventilation:
Provide adequate natural or explosion-proof mechanical ventilation to ensure

hydrogen does not reach its lower explosive limit of 4%

Personal Protective Equipment (PPE):

Skin Protection:

Glasses:
Safety glasses are recommended when handling cylinders.

Shoes:
Safety shoes are recommended when handling cylinders.

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

Gloves:
Work gloves are recommended when handling cylinders.

Respiratory Protection:

General Use:
None.

Emergency Use:
Air supplied respirators are required in oxygen-deficient atmospheres, air purifying

respirators will not function. Before entering area you must check for flammable or

oxygen-deficient atmospheres.
09. PHYSICAL AND CHEMICAL PROPERTIES

Physical State:
Gas

Color:
Colorless gas.

Odor:
Odorless

Molecular Weight:
2.016

Boiling Point:
-423.0F (-252.8C) @ 1 atm

Specific Gravity:
.0696 At 32F (0C) @ 1 atm, Air = 1

Freezing/Melting Point:
-434.55F (-259.2C), @ 1 atm

Vapor Pressure:
Not Applicable

Vapor Density:
.00521 lb./cu ft (0.08342 kg/CuM), At 70F (21.1C) @ 1 atm

Water Solubility:
.019 Vol./Vol at 60F (15.6C)

Expansion Ratio:
Not Applicable - Gas

pH:
Not Applicable - Gas

Odor Threshold:
Not Applicable (odorless)

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:
Oxidizing agents. Some steels are susceptible to hydrogen embrittlement at high

pressures and temperatures

Hazardous Decomposition Products:
None

Hazardous Polymerization:
Will not occur
11. TOXICOLOGICAL INFORMATION

Irritancy Of Material:
None.

Reproductive Effects:
None.

Teratogenicity:
None.

Synergistic Materials:
None.

Sensitization To Material:
None.

Mutagenicity:
None.
12. ECOLOGICAL INFORMATION

Ecotoxicity:
No adverse ecological effects are expected. Hydrogen does not contain any Class I

or Class II Ozone depleting chemicals (40 CFR Part 82). Hydrogen 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.

Residual product within process system may be vented at a controlled rate, to the

atmosphere through a vent stack that discharges to an elevated point. This vent

stack should be in an isolated area away from ignition sources.
14. TRANSPORT INFORMATION

DOT/IMO Shipping Name:
Hydrogen, compressed.

Hazard Class:
2.1 (Flammable gas.)

Identification Number:
UN1049

PIN:
1049

Product RQ:
None.

Shipping Label:
Flammable Gas.

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):
Flammable gas.

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