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Reply to "About Naphthenic Base Oil"

Cleanliness specs as in particle count? I don't think there are any. Particle count could be deceptive, as not all particles would be similarly conductive. As long as the oil passes D877 (Dielectric Strength) and D924 (Dielectric Constant/Power Factor), particulate levels seem sort of irrelevant. If the oil insulates, that's really all that matters. The contaminants of concern are water, corrosive sulfur and acidic components - all things that decrease insulating value.

Since these oils are typically in non-circulating applications (except maybe for very large substation Type I applications) any particles are going to wind up at the bottom of the can after a little while.
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