Methyl ethyl ketoxime

CAS: 96-29-7

Overview

Methyl ethyl ketoxime (CAS 96-29-7 ), commonly known as MEKO or 2-butanone oxime, is an oxime compound used primarily as a skinning inhibitor and anti-skinning agent in solvent-based coatings and alkyd systems.

It prevents premature surface oxidation in paints, varnishes, and printing inks during storage and application. In coatings and alkyd paints, MEKO is added at low concentrations to block metal drier activity.

This prevents surface skin formation before the product is applied during container storage. Printing ink manufacturers use it to extend shelf life in oxidatively drying ink systems without compromising cure performance.

Once the ink is exposed to air, the drying process proceeds as intended. In silicone sealants and adhesive formulations, MEKO acts as a crosslinker and release agent for various industrial applications.

This enables moisture-cure systems to achieve controlled adhesion profiles. It also functions as a catalyst precursor and intermediate in specialty chemical synthesis for diverse manufacturing sectors.

Methyl ethyl ketoxime is supplied as a clear liquid in standard industrial packaging, including drums and IBC containers. Technical grade is the predominant commercial specification for this material.

Purity levels are typically at 99% or above to meet industrial requirements. Bulk supply is available for high-volume coatings and sealant manufacturers, with smaller quantities offered for formulators.

R&D procurement teams can also access specialized quantities for testing. The product maintains stability when stored under proper conditions in original sealed containers away from heat.

Physical Properties

Melting Point	-29.5 °C
Boiling Point	149-151 °C
Density	0.9232 g/cm³ @ Temp: 80 °C
Flash Point	140 °F
Appearance	colourless liquid
Color	Clear colorless to pale yellow
Odor	Musty odor
Form	Liquid
Water Solubility	114 g/L (20 ºC)
Vapor Pressure	<8 mm Hg ( 20 °C)
Refractive Index	n 20/D 1.442(lit.)
Log P	0.63 at 25℃

Safety & Handling

Danger GHS05 GHS06 GHS08 GHS07 Hazard Statements H301 Toxic if swallowed H302 Harmful if swallowed H311 Toxic in contact with skin H312 Harmful in contact with skin H315 Causes skin irritation H317 May cause an allergic skin reaction H318 Causes serious eye damage H336 May cause drowsiness or dizziness H350 May cause cancer H351 Suspected of causing cancer H370 Causes damage to organs H372 Causes damage to organs through prolonged or repeated exposure H373 May causes damage to organs through prolonged or repeated exposure H402 Harmful to aquatic life H412 Harmful to aquatic life with long lasting effects Precautionary Statements P203 Obtain, consult and follow expert instructions for use. P260 Do not breathe dust/fume/gas/mist/vapours/spray. P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P262 Do not get in eyes, on skin, or on clothing. P264 Wash … thoroughly after handling. P270 Do not eat, drink or smoke when using this product. P271 Use only outdoors or in a well-ventilated area. P272 Contaminated work clothing should not be allowed out of the workplace. P273 Avoid release to the environment. P280 Wear protective gloves/protective clothing/eye protection/face protection. P316 Get emergency medical help immediately. P317 Get emergency medical help. P318 IF exposed or concerned, get medical advice. P319 Get medical advice/attention if you feel unwell. P321 Specific treatment (see … on this label). P330 Rinse mouth. P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P301+P316 Get emergency medical help immediately. P301+P317 Get emergency medical help. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P308+P316 Get emergency medical help immediately. P332+P317 Get emergency medical help. P333+P317 Get emergency medical help. P361+P364 Take off immediately all contaminated clothing and wash it before reuse. P362+P364 Take off contaminated clothing and wash it before reuse. P403+P233 Store in a well-ventilated place. Keep container tightly closed. P305+P354+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.

Trade & Regulatory

HS Code	29280090
UN Number	1993
ADR Class	3
Packing Group	III
WGK (Germany)	1

Other Names

Industries

Printing & Packaging Coatings, Adhesives, Sealants & Elastomers