Sludge - Varnish - Oxidation productsThere are numberous types of insoluble contaminants found in hydraulic and lubricating systems. The two most general classifications of insoluble contaminants are hard contaminants, such as dirt, debris and wear particles, and soft contaminants, composed of the various oil degradation by-products. Varnish and sludge originate from the soft contaminants. It is a thin, insoluble film that over time deposits throughout the internal surfaces of a lubrication system. The degradation process accelerates as the lubricant undergoes continued exposure to air, water, catalyst (metal particles) and high temperatures Sludge presence can have far-reaching consequences :
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