The potential of a substance to exert a harmful effect on humans or animals and a description of the effect and the conditions or concentration under which the effect take place. The commercial name or trademark by which a chemical is known. One chemical may have a variety of trade names depending on the manufacturers or distributors involved. The difference between the LEL and the UEL constitutes the flammable range or explosive range of a substance. That is, if the LEL is 1 ppm and the UEL is 5 ppm, then the explosive range of the chemical is 1 ppm to 5 ppm.
Vapors evaporate into the air from liquids such as solvents.
Solvents with low boiling points will evaporate.