In the world of lubrication, hot topics come and go. Whether it's synthetic oil, electric motor lubrication or ultrasonic-assisted regreasing, certain themes take on a greater profile from time to time. Lately, the hot topic that I've seen and have been asked more questions about than any other is varnish. From compressors to gas turbines, hydraulics to gearboxes, everyone seems to be talking about varnish. But, what is varnish? What causes it? And most importantly, how can it be prevented or eliminated? In the past few years, significant efforts have been made to try to understand this ubiquitous material. You'll find numerous articles, case studies and other information on the subject in Machinery Lubrication magazine and Noria's own Lubrication Excellence conference proceedings. Some of the brightest and most competent lubrication chemists and engineers have studied the issue and done a tremendous job helping to explain the cause, effect and techniques for varnish mitigation.
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