Methyl Ethyl Ketone
Methyl Ethyl Ketone (MEK), also known as Butanone, has the chemical formula of CH3COCH2CH3 and is used primarily as a solvent, particularly for resins, and exists in cleaning fluids and celluloid. Hobbyists use it as model cement, though its purpose is actually to weld the pieces together. Though it is primarily a manufactured substance, small amounts do occur naturally. Exhaust from cars and trucks release this chemical into the air.
Often found in paint removers, adhesives, and varnishes, this chemical compound is a colorless fluid that has a strong, sweet odor. It is highly flammable and known to cause irritation to skin and mucus membranes, including the eyes and nose.
This substance should be used in a well-ventilated area and while wearing protective clothing. It should not be inhaled or ingested. Once considered an environmentally dangerous substance and listed as a hazardous air pollutant, the U.S. Environmental Protection Agency removed it from the HAP list in 2005.