Physical and chemical properties
Physical state: Compressed gas.
Appearance: Colorless.
Odor: Odorless
Autoignition temperature 570 °C / 1058 °F (Hydrogen)

Hazard Statements

Extremely flammable gas
Contains gas under pressure; may explode if heated
May displace oxygen and cause rapid suffocation
May form explosive mixtures with air
Burns with invisible flame

Prevention

Keep away from heat,sparks,open flames,hot surfaces.
No smoking
Use and store only outdoors or in a well ventilated place
Use a back flow preventive device in piping
Use only with equipment rated for cylinder pressure
Do not open valve until connected to equipment prepared for use
Close valve after each use and when empty
Never put cylinders into unventilated areas of passenger vehicles

Handing and storage

Keep at temperatures below 52°C / 125°F.
Protect from sunlight when ambient temperature exceeds 52°C/125°F
Store in cool, dry, well-ventilated area of non-combustible construction away from heavily trafficked areas and emergency exits.
Cylinders should be stored upright with valve protection cap in place and firmly secured to prevent falling.
Full and empty cylinders should be segregrated.
Use a “first in-first out” inventory system to prevent full cylinders from being stored for excessive periods of time.
Stored containers should be periodically checked for general condition and leakage.
Outside or detached storage is preferred.