Abstract

IN an investigation of the action of detergent additives in engine lubricating oils, the sedimentation behaviour of suspensions of carbon black in a wide range of organic media has been studied. Suspensions were prepared by dispersing 0.5 gm. of carbon black (‘Micronex’) in 25 ml. of the liquid by means of 19 kc./s. ultrasonic vibration. The sedimentation behaviour of such systems falls into two distinct classes, depending on the detergent properties of the liquid.

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