ALTHOUGH today a lubricating grease may be made without soap and with its liquid component partly or even wholly non‐petroleum in origin, it is convenient and still correct to consider greases as soap thickened oils: the vast majority of them still are and will continue so to be for many years to come.
ELLIS, E.G. (1953), "laboratory evaluation of lubricating greases: PART ONE VISCOSITY, FLOW, PENETROMETERS, AND PLUNGER RHEOMETERS.", Industrial Lubrication and Tribology, Vol. 5 No. 2, pp. 11-16. https://doi.org/10.1108/eb052214
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