Sypzoils

Concentration: refractometer reading (Brix) × the fluid's factor. Typical: grinding 3-5%, turning and milling 5-8%, drilling and tapping 7-10%, broaching and difficult materials 8-12%. Too low gives rust, bacteria and tool wear; too high wastes money and irritates skin.
pH: about 8.6 to 9.5 for soluble and semi-synthetic fluids; below about 8.3 usually means bacteria are eating the fluid.
Hardness: about 80 to 200 ppm as CaCO₃; very soft water foams, hard water forms soaps and splits emulsions.
Bacteria: below 10⁵ CFU/mL is generally acceptable; 10⁶ or more calls for action.
Tramp oil: above 2% feeds bacteria and splits emulsions.

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Sypzoils

by Syproatek · v

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