VM-5S vacuum oil (TС 38.1011187-88) is produced from sulfurous or low-sulfur paraffinic oils by deep purification and special vacuum distillation. It is used as a working fluid in high-vacuum steam pumps (to create an ultra-high vacuum), in oil-sealed mechanical vacuum pumps.
Physical and chemical indicators of VM-5S vacuum oil (TС 38.1011187-88)
Name of the indicator | Norm GOST (TС) |
---|---|
Density at 20 °C g/cm3, not more than | 0,8750 |
Colour, units of COP, not more than | Colourless liquid |
Odour | Absence |
Kinematic viscosity, mm² / sec, at 50°С, not less than | 42 |
Flash Point, °С, in the open crucible, not less than | 250 |
Water content, % | Absence |
Content of mechanical impurities, % | Absence |
Mass fraction of water-soluble acids and alkalis, % | Absence |
Ash, %, not more than | 0,01 |
Vapor Pressure at 20°C, PA (mm Hg), not more than | 4,0×10-7 (3,0×10-9) |
Boiling point at which the vapor pressure is 1.33 Pa (1 × 10-2 mm Hg), ° С | 170-180 |