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Metalcutting Fluids Fight Microbial Contamination Edited by Russ Willcutt TECH BRIEF 28 PRODUCTION MACHINING :: DECEMBER 2016 M etalcutting fluids were once regarded as a commodity item playing an essential or even a lowly part in the production process, but not anymore. e fluids are now recognized as a key element in improving efficiency, extending tool life and keeping costs in check. e fluids'—traditionally oil- and water-based—smooth production processes involve anything from grinding to broaching. ey provide essential lubricity while easing the process of clearing metal chips and debris from the cut area. However, like anything created to aid with a machining process, problems can arise with metalcutting fluid as well. Fungal Infections Metalcutting fluids have always been vulnerable to micro- bial contamination. When unchecked, the contamina- tion causes fluids to become rancid. A poorly managed fluid with high levels of bacterial and fungal infection loses its effectiveness, and the contamination creates an acidic environment that causes emulsions to separate and lose their lubricating properties, potentially resulting in corrosion. Side effects include bad odors and, more importantly, added safety hazards for staff because of the addition of boron or formaldehyde-releasing agents required to treat the fluid. erefore, operators face increased fluid consumption and the need to use anti- microbial additives. Unfortunately, bacteria and fungi grow easily in warm, humid environments such as a coolant sump, and poor working practices can accelerate the spread of contamina- tion. Many operators reluctantly accept that metalcutting fluids must be continually monitored in order to keep them within specification. Good fluid management is time- and :: The green lines on this photo show the many points of cutting fluid contact where microbial growth can occur. Castrol's new formulations address this problem, helping keep machines and parts clean.