What is a Micro-Emulsion Coolant?

Micro-Emulsion Coolants

Micro-Emulsion CoolantsWhat is a Micro-Emulsion?

Micro-emulsions are clear, thermodynamically stable, isotropic mixtures of oil, water and surfacant (which lowers the surface tension between two liquids or a liquid and a solid). Most of the particles in the micro-emulsion are between 10 and 50 nanometers in diameter.

The term was coined in 1943 by two Cambridge University chemistry professors. The microemulsion systems are also called solubilized oil, transparent emulsions or micellar solutions.

Micro-emulsions are usually the result of:

  • Oil dispursed in water (globular)
  • Water dispursed in oil (globular)
  • Biocontinuous (interconnected)

These Micro-emulsion mixtures may also contain cosurfactants (which make surfacants more effective). Cosurfactants increase the oil solubility of microemulsions. Cosurfactants can also change the temperature range or the salinity range of microemulsion formations, to improve their use in certain applications.

Micro-emulsion Coolants

Micro-emulsions can provide the best of both worlds (synthetic coolant and soluble oil) as a coolant. They provide all the cooling properties of a synthetic plus the lubrication properties of a soluble oil. This makes them the best choice for medium to heavy duty machining operations on stainless steel.

Benefits of Micro-emulsion Coolants

In particular, micro-emulsion coolants provide:

  • Excellent cooling at the tool-workpiece interface
  • Can be used for multi-metal operations including carbon steels, yellow metal, aluminum and stainless steel
  • Can be formulated with Extreme Pressure lubrication additives
  • Superior hard water stability
  • Improved bio-resistance
  • Improved metal removal properties and chip carry out
  • Excellent tramp oil rejection
  • Able to be formulated for light, medium or heavy duty operations
  • Easier to remove soils from work piece after operation
  • Lower surface tension allows for better wetting and even films during machining

Our Micro-emulsion Coolant Products

Harry Miller Corp offers micro-emulsion coolants in the Kleerkut products series. Kleerkut 2900, Kleerkut 4960, most of the Kleerkut 4900* series, and the Kleerkut 5900 series are all micro-emulsion coolants.

If you would like to learn more about the micro-emulsion coolants and other products we offer, contact us today.

(*the exceptions being Kleerkut 4900-TLF and Kleerkut 4900–LFS)

Visit to Japan – May 2015

May 8th-14th, Harry Miller President, Bruce Entwisle, visited Daisho Seiki Corporation outside Osaka, Japan to qualify Harry Miller Products for use in their machines. While there, he created the following photo album of his travels:

Hamikleer® 1975-RP – Synthetic Coolant

Hamikleer® 1975-RP is similar to Hamikleer® 1975 but with improved rust protection for ferrous materials.

Hamikleer® 1975-XS – Synthetic Coolant

Hamikleer® 1975-XS is a synthetic coolant that provides improved hard water stability versus Hamikleer® 1975.

Hamikleer® 1975 – Synthetic Coolant

Hamikleer® 1975 is a synthetic coolant for ferrous and non-ferrous materials. It is designed for light-to-medium duty machining and grinding applications. It provides a liquid residual film to keep machine parts moving and has excellent wetting properties to allow swarf and fines to settle in the sump and not deposit on machinery.

Kleerkut® 4900-EPL – Heavy Duty Semi-Synthetic Coolant

Kleerkut® 4900-EPL is a high oil semi-synthetic with chlorinated extreme pressure additives for machining the toughest alloys.

Kleerkut® 4900-HD – Heavy Duty Semi-Synthetic Coolant

Kleerkut® 4900-HD has an enhanced, upweighted synthetic lubricant package, compared to Kleerkut 4900, for heavier duty applications. This product is chlorine-free.

Kleerkut® 4900-HP – Medium Duty Coolant

Kleerkut® 4900-HP is a lower oil version of 4900 designed for light-to-medium duty applications. This product has more reserve alkalinity to enhance pH stability and provide superior emulsion stability.

Hamikut® 100-MG3 – Soluble Oil Coolant

Hamikut® 100-MG3 possesses all the machining capabilities of Hamikut 100 but it has exceptional hard water stability that makes it very effective for machining magnesium and its alloys.

Hamikut® 9036-HP – Soluble Oil Coolant

Hamikut® 9036-HP is a soluble oil designed for light-to-medium duty applications on a wide variety of materials. It has excellent bioresistance, is low foaming and has more reserve alkalinity for longer pH stability and better rust protection.