Vapor Pressure Of Lubricating Oil

The vapor pressure of lubricating oil is very low and except for certain low vacuum or very high temperature applications, is not a limiting factor in typical lubrication practice. The data below were obtained by extrapolating the boiling points, at several reduced pressures, for three common viscosity grades of lube oil.

	30-35 cSt 150 SUS	65-70 cSt 300 SUS	80-85 cSt 400 SUS
	Oil Viscosity @ 40°C
Oil Temp °C	Vapour Pressure, millimeters of Mercury
40	0.00004	0.0000005	0.00000025
60	0.0003	0.000007	0.0000027
90	0.002	0.00008	0.000035
120	0.015	0.0009	0.0004
150	0.11	0.011	0.005
180	0.8	0.12	0.055
230	5.8	1.5	0.7
290	35	15	7.4

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Vapor Pressure Of Lubricating Oil