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In connection with a study of the impurities present in tb e isooctane (2,2,4trimethylpentane) certified for use as a primary standard reference fuel for the knock testing of motor fuels, a number of isoparaffin hydrocarbons have been obtained in a state of relatively high purity. The physical properties of these prepa rations whi ch have been accurately measured include in most cases the freezing point, ASTM octane number, boiling point, refractive index, and density, the coefficients of variation of the last two with temperature, and the coefficient of variation of boiling point with pressure.

Paraffin hydrocarbons isolated from crude synthetic isooctane (2,2,4-trimethylpentane)