Immediately Dangerous to Life and Health (IDLH) 03
Immediately Dangerous to Life and Health (IDLH) 03 : Concentration of chemical or gas in the air that would cause some kind of permanent health damage in a 30-minute exposure
NFPA 318 Standard for the Protection of Semiconductor Fabrication Facilities, 2002 ed. http://www.nfpa.org/assets/files/AboutTheCodes/318 /Errata318-02-2.PDF, (Std: Prot of Semiconductor Fabrication Fcilty - Amer) {297 NFC}