Is hydrogen cyanide gas explosive?
Hydrogen cyanide (AC) gas mixes well with air, and explosive mixtures are easily formed. Confined polymerization can cause container failure and a violent explosion. Hydrogen cyanide (AC) can decompose explosively on contact with alkaline materials.
What is the IDLH of HCN?
50 ppm
Basis for revised IDLH: Based on acute inhalation toxicity data in humans [Flury and Zernik 1931], the IDLH for hydrogen cyanide (50 ppm) is not being revised at this time.
What is a safe LEL level hydrogen?
LEL for Hydrogen: 4.0. LEL for Methane: 5.0.
What is the LEL and UEL?
Lower explosive limit (LEL): the lowest concentration of gas or vapour which will burn or explode if ignited. Upper explosive limit (UEL): the highest concentration of gas or vapour which will burn or explode if ignited. From the LEL to the UEL, the mixture is explosive.
How many ppm is HCN fatal?
2.1. In a review of human fatalities (ATSDR 1997), it was stated that exposure to airborne concentrations of HCN at 180 to 270 ppm were fatal, usually within several minutes, and a concentration of 135 ppm was fatal after 30 min. The average fatal concentration for humans was estimated at 546 ppm for 10 min.