Lead naphthenate has a number of functions in lubricants, including cutting oils, gear lubricants, extreme pressure lubricants, its main effect being that of an extreme pressure additive for lubricants reducing friction. It can also be used to inhibit the evolution of hydrogen sulphide from sulphurised mineral lubricating oils, and as an anti‐seizure agent in these oils. The napthenate has been incorporated into break‐in lubricants for ferrous and chromium plated piston rings running in aluminium cylinders, so that they do not scuff. The soap has been utlized in the preparation of metal cutting oils of the non‐soluble type, and to stabilize such oils wen they contain chloro‐hydro‐carbon.
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