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Reply to "About Naphthenic Base Oil"

Because of their superior solvency, a naphthenic will hold a more water without exhibiting a haze than a paraffinic.

35 ppm is the industry spec for transformer oils. They need to be very dry for obvious reasons. Due to the very critical spec, test precision-related variation between labs and the fact that water just seems to find its way into the most well-protected trailers, most reliable suppliers won't release naphthenic oil intended for transformer service if the water content measures over 30 ppm.
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