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 takes 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 range 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 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.