Physical Properties of MEK
MEK is a colorless and transparent liquid with a volatile odor similar to acetone. This characteristic odor is typical of methyl ethyl ketone. It is soluble in water, with a solubility of approximately 290 g/L at 20 degrees, and miscible with ethanol, diethyl ether, benzene, chloroform and most oils, making MEK highly versatile in industrial formulations. Its boiling point is about 79.6 degrees, and it is less volatile than acetone, being classified as a medium-boiling ketone solvent.
Flammability and Explosive Limits
The flash point is approximately minus 7 to minus 9 degrees. MEK is highly flammable, and its vapor can form explosive mixtures with air, with explosion limits of about 1.7 to 11.4 percent by volume. The low flash point requires strict fire precautions in storage and use, including grounding, ventilation and segregation from ignition sources.
Chemical Stability and Reactivity
MEK is chemically stable under normal conditions. However, the alpha-hydrogen atoms adjacent to the carbonyl group are relatively active and can undergo condensation and halogenation reactions. When reacting with strong oxidizing agents such as chromic acid, methyl ethyl ketone can be oxidized to acetic acid. The carbonyl chemistry of MEK is the basis of its use as a reaction solvent and intermediate.
Toxicity and Safety
MEK is classified as a low-toxicity solvent. High concentrations of MEK solvent vapors may have anesthetic effects, while contact with eyes and skin may cause mild irritation. Long-term exposure may affect the nervous system. The exposure limits are enforced by occupational safety regulations, and handling requires ventilation and protective equipment.
Applications
Due to these properties, methyl ethyl ketone uses are widespread in coatings, inks, adhesives, electronic cleaning processes and lubricant dewaxing operations. The medium evaporation rate and strong solvency make MEK a standard solvent in these industries, and its water solubility extends its use in cleaning formulations.
Quality and Supply
Industrial MEK is supplied with stable high purity, produced under quality management systems. Each batch is delivered with COA and MSDS, and the supply options include drums, ISO tanks and bulk, suitable for long-term contracts and large-volume industrial buyers.
Frequently Asked Questions
What is MEK? Methyl ethyl ketone, also called 2-butanone, with CAS 78-93-3.
What is the boiling point of MEK? about 79.6 degrees, a medium-boiling ketone solvent.
Is MEK soluble in water? Yes, about 290 g/L at 20 degrees.
What are the explosion limits? about 1.7 to 11.4 percent by volume in air.
What is MEK used for? Coatings, inks, adhesives, electronics cleaning and dewaxing.