Chemicals and Solvents

What is MEK (Methyl Ethyl Ketone)?

Methyl Ethyl Ketone (MEK) is a colorless, liquid chemical substance that is used in many industrial production processes. It is a natural solvent, making it a key component in many different chemical mixes and surface treatments.

MEK - Chemical Properties: Solubility, Molar Mass and Molecular Density

Methyl Ethyl Ketone (C4H8O) is an organic compound that is a strong, corrosive, naturally oxidizing agent.

It is also referred to as Butanone or 2-Butanone, and while it is a particularly effective solvent itself, MEK is soluble in alcohol and water. It is a liquid ketone with no color, and a sharp odor similar to acetone. In fact, MEK and acetone share similar chemical compounds. MEK is favored for its strength over acetone, as it boils at a higher temperature and has a slower evaporation rate. It has a boiling point of 175.4°F (79.64°C), a molar mass of 72.11 g/mol, and a molecular density of 0.8049 g/mL. While MEK is a predominantly manufactured chemical used for industrial purposes, it can also be found in trace amounts in nature.

What is Methyl Ethyl Ketone (MEK) used for?

MEK is a commonly used industrial solvent. It is very useful in industrial processes as it can be applied to various manufacturing procedures and products. Because methyl ethyl ketone is such a highly effective solvent, it is a common ingredient in processing resins, coatings, and mixtures; as well as manufacturing plastics, inks, and dyes.

Cautions in using Methyl Ethyl Ketone (MEK)

Exposure to MEK typically involves vapors that are present in the air when handling the liquid, or by direct contact with skin. This can occur in individuals that are exposed to specific glues or coatings, and in factories or labs where synthetic rubber or glues are made. Short-term inhalation of methyl ethyl ketone can cause irritation to the eyes, nose, and throat. Although there have not been many long-term studies done to show the effects of prolonged exposure to MEK, experts advise exercising caution when handling the substance. Methyl ethyl ketone is also flammable, and it can react with most oxidizing materials.

Proper safety measures should be taken when handling and storing the liquid. Store MEK in non-reactive material in a cool, dry place. MEK should be handled in well-ventilated areas, while following proper safety standards and wearing appropriate PPE (personal protective equipment) that covers any exposed skin. Chemical resistant gloves, chemical splash goggles, and face protection are recommended when handling the liquid.

Top 5 Uses for Methyl Ethyl Ketone (MEK)

1. Cleaning agent

Because MEK is naturally corrosive, it is a strong degreaser and can also be used to remove adhesives  and other coatings from surfaces. MEK can be used to remove residual glue, dirt, grease, paint, or older coating layers that are starting to erode. MEK is often used to clean surfaces before new paint or parts are installed. It is sometimes used as a step in refurbishing products before reuse.

2. In petrochemical plastics

MEK can be used as a hardener in the manufacturing of resins, synthetic rubber, and as a solvent in making other chemicals for plastic production.

3. Paints, dyes, and glue

If you’ve ever smelled the distinct, sharp scent of a dry-erase marker, you’ve used a product of methyl ethyl ketone.  MEK’s slow evaporating properties make it a useful ingredient in products like dry-erase markers. It is used as a solvent in the dye to ensure the ink flows properly. MEK is also a common ingredient in paint and paint products, like lacquer and other varnishes;  as well as paint remover and glue.

4. Curing agent

MEK is commonly found in the fiberglass and plastic manufacturing industry. It is used as a curing agent for unsaturated polyester resins and fiberglass plastics. MEK is what’s known as a catalyst in this process for both vinyl and polyester resins. MEK cures the resin by reacting with it to solidify it from a liquid state.

5. In bonding and manufacturing

MEK is used as an effective plastic welding agent. It can dissolve many plastics, including polystyrene, and can bind plastics together. MEK works as a welding agent by dissolving the surface where it is applied and then evaporating - acting as more of a chemical welding agent. It can also be used to manufacture plastics themselves, as well as textiles, and paraffin wax.

Benefits of MEK

• Diverse application of uses
• Efficient solvent
• Soluble in water and alcohol
• Useful chemical ingredient in inks, adhesives, resins, glue, and dyes

Methyl ethyl ketone’s natural properties as a solvent and incredibly diverse abilities as an organic compound make it ideal for use in producing and manufacturing a wide array of other useful liquids, plastics, textiles, and chemical intermediates.

For over 40 years, Lab Pro Inc. has been committed to delivering the highest quality chemicals such as MEK, lab equipment, lab supplies, and cleanroom PPE apparel to medical device and electronic manufacturing laboratories worldwide. To learn more, visit the biggest Lab Supply showroom in California, or contact us online or at 888-452-2776.