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TECHNICAL DATA
4.5 Lubrication Data
Welch Directorr™ Premium vacuum oil is a triple-distilled hydrocarbon oil using severely hydro treated
base stock. The oil is designed to resist breakdown at higher RPMs and operating temperatures of
direct-drive vacuum pumps. The hydro treating virtually eliminates aromatics and sulfur to give good
resistance to sludge and varnish formation over time in corrosive environments. Directorr™ Premium
vacuum oil enables Welch direct-drive vacuum pumps to maintain the highest vacuum performance
over time. The oil is light yellow.
CAS No.
64742-65-0
Vapour Pressure (at 25°C) 1×10
-6
mbar (1×10
-6
torr)
Viscosity (at 40°C)
65 cSt (305 SUS)
Specific Gravity
0.87
The technical data and operating characteristics of Rotary vane pumps are only guaranteed
if original Welch Directorr™ Premium vacuum oil is used!