Methyl Ethyl Ketone (MEK)

MEK applications by sector

MEK earns its place in a formulation for two reasons: it cuts high-solids resin systems that weaker solvents leave gummy, and its evaporation rate (roughly 3.8x that of n-butyl acetate) sets a predictable working window. Below are the sectors where it does the most work.

Coatings, paints, lacquers and varnishes

This is MEK’s largest home. It dissolves acrylics, vinyls, epoxies, polyurethanes, and nitrocellulose, and it is a workhorse in high-solids coatings where a strong active solvent lets formulators carry more resin at lower total VOC. Coatings chemists use it as the primary solvent and as a viscosity-reduction tool — a measured addition drops application viscosity for spray or roll without slashing solids. The fast, even flash-off helps film leveling and reduces blush and pinholing on production lines.

Adhesives and contact cement

MEK dissolves the base polymers in rubber-based industrial cements, contact adhesives, and polyurethane adhesives while holding the right application viscosity. Its quick evaporation lets a bond reach tack and set on a line cadence rather than waiting on a slow-drying carrier. It is also a common surface prep and cleaning solvent immediately before bonding plastics and laminates.

Printing inks

In flexographic and gravure inks, MEK is a key solvent and carrier — it sets viscosity, dissolves the resin vehicle, and flashes off fast enough to keep press speeds high on film and foil substrates. Good resin compatibility and a clean evaporation profile keep dot and density consistent across a run.

Industrial cleaning and degreasing

The same strong solvency that dissolves resins makes MEK an effective degreaser and parts cleaner for removing uncured adhesives, coating overspray, and oily soils from metal and tooling. The fast flash-off means surfaces dry quickly with little residue before the next process step.

Plastics, PVC, resin processing and dewaxing

MEK is a process solvent in resin and synthetic-leather manufacture and a solvent for cellulose acetate and nitrate. In petroleum refining it is the working medium for MEK lube-oil dewaxing, where it chills and precipitates wax out of base oils, and it serves more broadly as an extraction medium for waxes, fats, oils, and resins.

MEK peroxide precursor and specialty coatings

MEK is the feedstock for methyl ethyl ketone peroxide (MEKP), the catalyst used to cure unsaturated polyester and vinyl-ester resins in fiberglass and composites. It also has a long history as a solvent in magnetic-tape and specialty functional coatings, where a clean, fast-drying carrier is required.

Grades and specification context

MEK is supplied to ASTM D740, which recognizes two types: Type I regular grade and Type II urethane grade. The practical difference is water content and trace impurities. Urethane-grade MEK is held to a tighter water spec because moisture interferes with isocyanate chemistry — even small amounts can scavenge isocyanate and disrupt polyurethane cure. For most coatings, adhesives, and ink work, a standard industrial grade is the right call; specify urethane grade when the resin system is moisture-sensitive. When you request a quote, share your target purity, water-content limit, and any color or non-volatile-matter constraints so the supply can be matched to your formulation rather than over- or under-specified.

Handling and safety

MEK is a highly flammable liquid (UN 1193) with a flash point well below room temperature and a low autoignition margin, so it demands grounded, vapor-controlled handling, bonded transfer, and ignition-source control. It is an eye, skin, and respiratory irritant and can cause drowsiness or dizziness at high vapor concentrations, which makes ventilation and appropriate PPE non-negotiable. None of this is unusual for an industrial ketone solvent, but it does govern how you store and dispense it. The Safety Data Sheet is the controlling document for classification, exposure limits, and handling — a current SDS ships with every order, and it, not this page, governs your site procedures.

Source MEK in bulk from RawSource

RawSource sources methyl ethyl ketone (MEK, CAS 78-93-3) in bulk for coatings, adhesive, ink, and resin manufacturers — drums, totes, and bulk quantities, with a CoA and SDS per shipment. Tell us your grade, packaging, target volume, and delivery location and we will quote current pricing and lead time. Request a bulk quote.