Section 100:1. APPENDIX a. Concentrations at which some common substances exhibit immediately dangerous to life or health (IDLH) effects

APPENDIX A.

Concentrations at which some common substances exhibit immediately dangerous to life or health (IDLH) effects.

Appendix A is a non-mandatory appendix. According to The National Institute for Occupational Safety and Health (NIOSH) the levels listed below represent a maximum concentration from which one could escape within 30 minutes without any escape-impairing symptoms or any irreversible health effects. These levels were published by NIOSH in September 1985 and are subject to frequent change. This list is not meant to be all inclusive but rather is meant to list some of the more frequently encountered chemicals in confined spaces.

Appendix A
CHEMICAL NAME	IDLH LEVELS*
Ammonia	500 ppm
Benzene	2,000 ppm
Butadiene	20,000 ppm
2 - Butanone	3,000 ppm
Carbon dioxide	50,000 ppm
Carbon monoxide	1,500 ppm
Carbon tetrachloride	300 ppm
Chlorine	25 ppm
Chlorobromomethane	5,000 ppm
Chloroform	1,000 ppm
Cresol	250 ppm
Cyclohexane	10,000 ppm
Dichlorodifluoromethane	50,000 ppm
Dichloromonofluoromethane	50,000 ppm
Ethyl acetate	10,000 ppm
Fluorotrichloromethane	10,000 ppm
Heptane	4,250 ppm
Hexane	5,000 ppm
2 - Hexanone	5,000 ppm
Hydrogen chloride	100 ppm
Hydrogen sulfide	300 ppm
Isopropyl alcohol	20,000 ppm
Liquefied petroleum gas	19,000 ppm
Methyl alcohol	25,000 ppm
Methyl cellosolve	2,000 ppm
Methyl cellosolve acetate	4,500 ppm
Methyl chloroform	1,000 ppm
Methylene chloride	5,000 ppm
Nitric oxide	100 ppm
Nitrogen dioxide	50 ppm
Octane	3,750 ppm
Ozone	10 ppm
Pentane	5,000 ppm
Petroleum distillates mixture	10,000 ppm
Phenol	100 ppm
Phosgene	2 ppm
Propane	20,000 ppm
Sodium hydroxide	200 mg/M3
Stoddard solvent	5,000 ppm
Styrene	5,000 ppm
Sulfur dioxide	100 ppm
1, 1, 2, 2, - Tetrachloro-1, 2 - difluroethane	15,000 ppm
Toluene	2,000 ppm
Toluene-2, 4-diisocyanate	10 ppm
Trifluoromonobromomethane	50,000 ppm
Turpentine	1,900 ppm
Xylene	10,000 ppm
*Reference NIOSH/OSHA Pocket Guide to Chemical Hazards DHEW (NIOSH) Publication No. 78-210

Historical Notes

Derived from VR425-02-30, eff. November 15, 1987; amended, eff. July 1, 1988.

Statutory Authority

§ 40.1-22(5) of the Code of Virginia.