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Quick Primer: Classes of MWFs

August 01, 2012
Jean Van Rensselar
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MWF Quick Primer

Excerpt from TLT's Feature Article in August 2012, The Growth of Biobased Metalworking Fluids by Jean Van Rensselar. It's a quick way to get acquainted with different classes of metalworking fluids. Read the rest of the article here.

MWFs have many applications, but all have the basic purpose of lubricating and cooling the work piece-tool interface, flushing scrap and residue from the work area and improving the surface finish on end products.

MWFs are categorized into the following four classes:

  • Straight/neat/cutting oil. Ultra-refined oils that are not diluted with water but may contain additives.
  • Soluble oil. Composed of anywhere from 30% to 85% severely refined basestock, water and emulsifiers.
  • Semi-synthetic fluids. Containing 5%-30% severely refined oils, 30% to 50% water and several additives.
  • Synthetic fluids. Composed of compounds that do not contain any petroleum or vegetable products.

Each of the four classes also may contain additives such as biocides, corrosion inhibitors, extreme pressure chemicals, defoamers, emulsifiers, stabilizers, dispersants and dyes.

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