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The lubricating properties of model systems based on overbased calcium sulphonate have been studied by sirnudating various kinematic, temperature, and load-speed conditions of fiiction machines as well as by investigating the physical chemistry of friction surfaces. It is found that overbased sulphonate complex grease shows good antifriction, antiwear, and extreme-pressure properties. A synergistic action of calcium tetraborate with overbased sulphonate has been shown. It is found that calcium 12-hydroxystearate, however, has little effect on lubricating properties, but it improves the thixotropic characteristics of a sys tem .

The dependence of the properties of polyurea greases on the composition of the dispersion medium was investigated. Synthetic lubricating fluids of different chemical natures and mixtures of these fluids were used as the dispersion medium. Lubricants on a mixed base have better lubricant properties than lubricants based on the individual synthetic fluids.

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