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Paraffinic oils are distinguished by a
molecular structure composed of long chains of hydrocarbons,
i.e., the hydrogen and carbon atoms are linked in a long
linear series similar to a chain. Paraffinic oils contain
paraffin wax and are the most widely used base stock for
lubricating oils. In comparison with naphthenic oils,
paraffinic oils have:
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Excellent stability (higher resistance
to oxidation).
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Higher pour point.
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Higher viscosity index.
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Low volatility and, consequently, high
flash points.
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Low specific gravities.
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