Methyl Ethyl Ketoxime

MEKO, 2-Butanone oxime.

CAS: 96-29-7
EC: 202-496-6
Sectors: Coatings, Adhesives, Sealants & Elastomers

Methyl Ethyl Ketoxime (CAS 96-29-7), also known as MEKO or 2-butanone oxime, is an oxime supplied as a clear, colorless liquid with a characteristic odor, typically offered at >99% purity, and used as an anti-skinning agent for alkyd paints and varnishes and as an isocyanate blocking agent in polyurethane coatings. It works by preventing the oxidative polymerization of drying oils at the surface of the liquid in the container. This Technical Grade chemical is essential for maintaining the shelf life of alkyd-based paints and varnishes. Its high volatility ensures it evaporates quickly after application, allowing the coating to cure naturally.

Typical Properties

Molecular formula	C₄H₉NO
Molecular weight	87.12 g/mol
Appearance	colourless liquid
Form	Liquid
Color	Clear colorless to pale yellow
Odor	Musty odor
Melting point	-29.5 °C
Boiling point	149-151 °C
Density	0.9232 g/cm³ @ Temp: 80 °C
Water solubility	114 g/L (20 °C)
Flash point	140 °F
GHS signal word	Danger · Corrosive, Acute toxicity, Irritant / harmful, Health hazard
HS code	29280090
Grades available	Technical Grade

Typical literature values for identification; lot-specific results are stated on the certificate of analysis (COA) and the safety data sheet (SDS) that accompany every delivery.

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