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  • Butanone

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Butanone, also known as methyl ethyl ketone (MEK), is an organic compound with the formula CH3C(O)CH2CH3. This colorless liquid ketone has a sharp, sweet odor reminiscent of butterscotch and acetone. It is produced industrially on a large scale, and also occurs in trace amounts in nature. It is soluble in water and is commonly used as an industrial solvent. Methyl ethyl ketone is a colorless fairly volatile liquid with a pleasant pungent odor. Flash point 20°F. Vapors heavier than air. Does not react with water or many common materials. Stable in normal transportation. Irritates the nose, eyes, and throat. Combustion may produce toxic materials. Used as a solvent, for making other chemicals, and for production of wax from petroleum.

Butanone occurs as a natural product. It is made by some trees and found in some fruits and vegetables in small amounts. It is also released to the air from car and truck exhausts. The known health effects to people from exposure to butanone are irritation of the nose, throat, skin, and eyes.

Molar mass
72.107 g/mol
CAS Number
0.8050 g/mL
Melting point
?86 °C (?123 °F; 187 K)
Boiling point
79.64 °C (175.35 °F; 352.79 K)
Solubility in water
27.5 g/100mL
Refractive index (nD)

Note: The chemical specifications for some items on this product page may differ from the specifications listed above. For more information, consult with our manager. A detailed specification for any chemical product is available on request.

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