Non-petroleum liquids

In Table 17-1 are listed seven of the more important types of chemical structures according to which the non-petroleum liquids discussed in this chapter may be classified. All of these lubricants are synthetic l.t. their structures are the result of substantial chemical alteration of the starting material, in contradistinction to the refining of natural petroleum oils, which principally separates the crude oil into fractions and removes the unwanted portions thereof. Even though synthetic lubricants of the hydrocarbon type may have had their origin in raw materials obtained from petroleum, they are the products of substantial... 

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