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Chemical Sampling Information (CSI)
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General Description

OSHA IMIS Code Number: 1410

Chemical Abstracts Service (CAS) Registry Number: 1333-74-0

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: MW8900000

Chemical Description and Physical Properties:

gas

Exposure Limits

OSHA Permissible Exposure Limit (PEL):

Construction Industry: 29 CFR 1926.55 Appendix A -- Simple asphyxiants. The limiting factor is the available oxygen which shall be at least 19.5 percent and be within the requirements addressing explosion in part 1926.

Maritime: 29 CFR 1915.1000 Table Z-Shipyards -- Simple asphyxiants. The limiting factor is the available oxygen which shall be at least 18 percent and be within the requirements addressing explosion in subpart B of part 1915.

American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): Simple Asphyxiant

Health Factors

Potential Symptoms: Drowsiness, unconsciousness, asphyxia; severe burns and frostbite from contact with liquid

Health Effects: Asphyxiant (HE17); Explosive (HE18)

Affected Organs: CNS

Notes:

  1. OSHA does not have a PEL for hydrogen. In confined spaces, oxygen content should be at least 19.5% by volume.
  2. Gas/air mixtures are explosive. There is no odor warning.

Literature Basis:

  • International Chemical Safety Cards (WHO/IPCS/ILO): Hydrogen.
  • Pohanish, R.P. (editor): Hydrogen. In, Sittig's Handbook of Toxic and Hazardous Chemicals and Carcinogens, Fourth Ed., Vol. 1. Norwich, NY: Noyes Publications, William Andrew Publishing, 2002, pp. 1272-1273.

Date Last Revised: 02/23/2004

Monitoring Methods used by OSHA

On-Site Sampling Techniques/Methods:

  • device: Detector Tube
    manufacturer: Dräger
    model/type: Hydrogen 0.2%/a, order no. 81 01511
    sampling information: 1 stroke
    upper measurement limit: 2.0 Vol.-%
    detection limit: approximately 0.1 Vol.-%
    overall uncertainty: approximately 25%
    method reference: on-site air secondary (manufacturer)

  • device: Detector Tube
    manufacturer: Dräger
    model/type: Hydrogen 0.5%/a, order no. CH 30901
    sampling information: 5 strokes
    upper measurement limit: 3.0 Vol.-%
    detection limit: approximately 0.2 Vol.-%
    overall uncertainty: approximately 25%
    method reference: on-site air secondary (manufacturer)

  • device: Detector Tube
    manufacturer: Gastec
    model/type: 30
    sampling information: 1 stroke
    upper measurement limit: 2.0%
    detection limit: 0.5%
    overall uncertainty: unknown
    method reference: on-site air secondary (manufacturer)

  • device: Detector Tube
    manufacturer: Matheson-Kitagawa
    model/type: 8014-137U
    sampling information: 1 or 2 strokes
    upper measurement limit: 0.8%
    detection limit: approximately 0.02%
    overall uncertainty: unknown
    method reference: on-site air secondary (manufacturer)

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