Metalworking fluids become contaminated as they are used. A primary problem is contamination with tramp oil. The degree of contamination can be minimized through maintenance and periodic change of seal and wipers. Other maintenance measures include: use of stable cutting and grinding fluids, use of demineralized water for mixing, fluid concentration control, control of fluid chemistry, and regular cleaning of fluid through filtering or centrifugation. Recycling of deteriorated fluids reduces the amount to be disposed of or hauled, and minimizes replacement with new fluid material . While small plants and shops prefer offsite recycling, larger plants can apply in-plant recycle using the methods described in the metalworking fluid treatment in the Section 5.5.
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