Vapor Pressure Of Mineral Oil

Vapor Pressure Of Mineral Oil

The vapor pressure of lubricating oil is very low and is not a limiting factor in typical lubrication practice. The data below is for three common grades of lube oil and are estimates only. The information is often useful for oils in heat transfer systems. Vapor pressure increases as oil temperature increases.

Oil grade (viscosity @ 40°C)	ISO 32	ISO 68	82 cSt

Oil temperature	Vapor pressure, mm of mercury for oil grade
40°C	0.00004	0.0000005	0.00000025
60°C	0.003	0.000007	0.0000027
90°C	0.002	0.00008	0.000035
120°C	0.015	0.0009	0.0004
150°C	0.11	0.011	0.005
180°C	0.8	0.12	0.055
230°C	5.8	1.5	0.7
290°C	35	15	7.4

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