Hydrogen (H₂)
CAS Number:
1333-74-0
Hydrogen (H₂) is a colorless, odorless, tasteless gas that is the lightest and most abundant element in the universe. In industry, hydrogen is used in petroleum refining, chemical synthesis, fuel cells, rocket propellant, and metal processing. It is not toxic, but it is an extremely flammable asphyxiant with a wide flammable range (4–75% in air) and a very low ignition energy. In enclosed spaces, hydrogen can displace oxygen and cause asphyxiation, while any ignition source can trigger explosive combustion. Battery charging operations, hydrogen fueling stations, and electrochemical processes are common sources of workplace hydrogen release.
Hydrogen (H₂) is a highly flammable gas used in refining, chemical processing, fuel cell work, and metal processing. Rent hydrogen gas detection equipment from RAECO Rents to support leak checks, confined space screening, and hot work safety where hydrogen may be present. All gas instruments are bump tested before shipment and supported with routine span calibration so crews can trust the readings in the field.
Regulatory Exposure Limits
As of March 09, 2026
OSHA PEL
TWA:
N/A
STEL:
N/A
C:
N/A
NIOSH REL
TWA:
N/A
STEL:
N/A
C:
N/A
ACGIH TLV
TWA:
N/A
STEL:
N/A
C:
N/A