METAL WORKING FLUIDS COMPOSITION

A composition of antiseptic metal working fluids is provided to prevent decomposition of the working fluid by excluding non-biodegradable formaldehyde and using environment-friendly materials. A composition of antiseptic metal working fluids consists of minerals of 50~70wt.% having kinematic viscosity of 8~31cst at 40°C, polyoxyethylene alkyl ester(3~6 mol.) of 5~10wt.%, polyethylene glycol mono-oleate of 5~10wt.% having molecular weight of 400~600, chloroparaffin of 10~20wt.% having the content weight of 42%, sulfol 465 of 5~10wt.%, potassium hydroxide below 2wt.%, ion exchanged water of 2~7wt.%, sodium gluconate of 1~5wt.%, and an additive of 0.1~0.5wt.% such as a silicone antifoaming agent. The mineral reduces friction resistance and facilitates machining work by increasing lubricating ability between a workpiece and a tool in cutting and winding ferrous and nonferrous metals.