VM-4 oil

Vacuum oil VM-4 (TU 38.401-58-3-90) is a working fluid for high-performance steam booster, auxiliary steam jet and special backing vacuum pumps, oil-sealed mechanical vacuum pumps. The range of working media for vacuum generating equipment includes highly refined mineral (petroleum) and some synthetic products called vacuum oils. Due to the specific operating conditions of vacuum-generating technology, the indicators of vacuum oils are viscosity, saturated vapor pressure, ultimate residual pressure, as well as stability against oxidation.

Physical and chemical indicators of VM-4 oil (TU 38.401-58-3-90)

Name of the indicator Norm GOST (TU)
Density at 20°C, g/cm3 0,9080
Colour, units of COP, not more than 7,0
Kinematic viscosity, mm²/sec:
at 20°С, not more -
at 50°С 48-57
at 100°С 8-11
Flash Point, °С:
in the open crucible -
in the closed crucible, not less than 205
Acid number, mg КОН/g, not more than 0,2
Coking capacity, %, not more than 0,20
Pour point, °С, not higher than -15
Stability against oxidation:
acid number, mg КОН / g, not more than -
increase in viscosity at 50°С, not more than -
Fractional composition:
head temperature distillation,°С, not less than 370
90% of oil is distilled at a temperature, °С, not higher than 515
Mass fraction of water, % Absence
Vapor pressure at 20°С, Pa, not more than 5,х10-3