Upper Explosive Limit 11 : (UEL) The maximum concentration of vapor or gas in air above which flame propagation does not occur. See: Upper Flammable Limit; See also: Flammable Limit
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}