Ester / Diester Fluids

Fluids are based upon phosphate ester, dibasic ester, polyol ester, silicate ester or diester compounds. Phosphate esters and other synthetic fluids tend to have the highest fire resistance and cost. They are generally used in a diluted form with concentrations from 3% to 10%. Synthetic fluids often provide the best cooling performance among all cutting fluids. Semi-synthetic fluids are combinations of synthetic and soluble petroleum or mineral oil fluids. The characteristics, cost and heat transfer performance of semi-synthetic fluids falls between those of synthetic and soluble oil fluids. Some synthetics such as phosphate esters react or dissolve paint, pipe thread compounds and electrical insulation.