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1.1 ,This test method covers the calculation of the carbon distribution and ring content (Note 1) of olefin-free petroleum oils from measurements of refractive index, density, and molecular weight (n-d-M).2 This test method should not be applied to oils whose compositions are outside the following ranges:
1.1.1 ,In terms of carbon distribution—,up to 75 ,% carbon atoms in ring structure, percentage in aromatic rings not larger than 1.5 times the percentage in naphthenic rings.