INCREASING THE ELECTRICAL RESISTIVITY OF ESTER LUBRICANTS, ESPECIALLY FOR USE WITH HYDROFLUOROCARBON REFRIGERANTS.

摘要

The electrical resistivity of hindered polyol ester lubricants can be raised to very high levels by treating the lubricants with activated alumina, preferably after the acid values of the lubricants treated have already been reduced to low levels by conventional refining with alkali or other acid scavengers.