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Naphthenic oils. In contrast to
paraffinic oils, naphthenic oils are distinguished by a
molecular structure composed of “rings” of hydrocarbons,
i.e., the hydrogen and carbon atoms are linked in a circular
pattern.
These oils do not contain wax and behave
differently than paraffinic oils. Naphthenic oils have:
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Good stability.
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Lower pour point due to absence of wax.
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Lower viscosity indexes.
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Higher volatility (lower flash point).
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Higher specific gravities.
Naphthenic oils are generally reserved for
applications with narrow temperature ranges and where a low
pour point is required.
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