Material Safety Data Sheets. M.J. Electric, Inc. What is a Material Safety Data Sheet (MSDS)?. An MSDS is a technical document which provides detailed and comprehensive information on a controlled product related to: health effects of overexposure to a substance;
M.J. Electric, Inc.
It is the LOWEST percent volume/volume ratio of a vapour or gas in air that can explode if ignited.
Mixtures below L.E. L. are to “lean” to burn.
E.g.. Gasoline has an L.E. L. of 1.4%. If the conc of the vapours is <1.4% there is no risk. But when it reaches 1.4% (LEL) a spark or flame can cause the mixture to explode!
UPPER explosive limit (U.E.L.)
It is the HIGHEST percent volume/volume ratio of a vapour or gas in air that can explode if ignited.
Mixtures above U.E. L. are to “rich” to burn.
E.g.. Gasoline has an U.E. L. of 7.4%. If the conc. of the vapours is >7.4% there is no risk. However, dilution will reduce the concentration to the explosive range.Fire or Explosion Hazard contd.Explosive limit