VM-6 vacuum oil (TC 38.401-58-3-90) is a working fluid, used for oil-sealed mechanical vacuum pumps. The range of working fluids 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 main indicators of vacuum oils are viscosity, saturated vapor pressure, ultimate residual pressure, as well as stability against oxidation.
Physical and chemical indicators of VM-6 vacuum oil (TU 38.401-58-3-90)
Name of the indicator | Norm GOST (TC) |
---|---|
Density at 20°C g/cm3 | - |
Colour, units of COP, not more than | 4,5 |
Kinematic viscosity, mm²/sec: | |
at 20°С, not more than | 220 |
at 50°С, not more than | 40 |
at 100°С, not more than | 8 |
Flash Point, °С: | |
in the open crucible | Not normalised. Evaluation required |
in the closed crucible, not less than | 216 |
Acid number, mg КОН/g, not more than | - |
Coking capacity, %, not more than | - |
Pour point, °С, not higher than | -10 |
Stability against oxidation: | |
acid number, mg КОН/g, not more than | - |
increase in viscosity at 50°С, not more than | 50 |
Fractional composition: | |
head temperature distillation, °С, not less than | 125 |
90% of oil is distilled at a temperature, °С, not higher than | 220 |
Mass fraction of water, % | Absence |
Vapor pressure at 20°С, Pa, not more than | 4,0×10-4 |