Mineral, naphthenic, and polyalphaolefin (PAO) base oils as raw-material inputs for metalworking fluids and industrial lubricant blending.
Base oils are the major raw-material fraction of almost every lubricant and water-soluble metalworking fluid — commonly 70 to 95 percent of the finished blend — and they carry the additive package that does the protecting. In industrial manufacturing they fall into three working types: paraffinic mineral oils, naphthenic oils, and synthetic polyalphaolefins (PAO). The base oil sets the viscosity, the solvency for additives, and the oxidation and thermal behavior of the finished fluid.
Paraffinic mineral oils, such as a 90-viscosity stock, are the default carrier for general lubricants and soluble cutting fluids because they balance cost, viscosity, and additive response. Naphthenic oils carry a lower pour point and dissolve additives and metal soaps more readily, which makes them useful in soluble metalworking concentrates and in fluids that must stay clear at low temperature. Choose naphthenic where solvency and low-temperature behavior matter more than oxidation life.
Polyalphaolefin is the synthetic option. It gives a higher viscosity index, better oxidation stability, and a wider service-temperature range than mineral stock, which extends drain intervals in demanding lubricants. The trade-off is cost: PAO runs several times the price of a paraffinic base oil, so it is specified where service life or temperature span justifies the spend, not as a drop-in for commodity fluids. Blend it with esters when additive solubility needs a lift.
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