VM-1S oil (TC 38.1011187-88) is produced from sulfurous or low-sulfur paraffinic oils by deep purification and special vacuum distillation.
The operation of vacuum units and pumps is impossible without lubricating fluid. This liquid is a special vacuum oil for vacuum equipment. Any vacuum oil is a liquid with low vapor pressure, which is used as a lubricant for rubbing surfaces in vacuum devices. In addition, synthetic vacuum oil is used as a working fluid in oil-steam pumps or as a sealing fluid in mechanically operated pumps. The main area where vacuum oil is used is volumetric vacuum pumps (high-vacuum steam, oil-sealed mechanical pumps, steam booster, steam-jet, as well as for filling liquid vacuum gauges).
In mechanical pumps, vacuum oil is necessary for the tightness of the working chambers of the mechanism. This task requires special qualities that the oil must possess. The level of performance of this oil depends on the viscosity. The viscosity determines how quickly a given vacuum oil will evaporate.
Physical and chemical indicators of VM-1S oil (TС 38.1011187-88)
|Name of the indicator||Norm GOST (TС)|
|Density at 20°C g/cm3, not more than||0,870|
|Colour, units of COP|
|from medical oil||Colorless liquid|
|from white oils, not more than||0,5|
|from medical oil||Absence|
|from white oils||A slight odour of oil|
|Kinematic viscosity, mm² / sec, at 50°С, not less than||35|
|Flash point in the open crucible, °С, not less than||243|
|Mass fraction of mechanical impurities||Absence|
|Content of water-soluble acids and alkalis, %||Absence|
|Water content, %||Absence|
|Ash, %, not more than||0,01|
|Vapor Pressure at 20°C, PA (mm Hg), not more than||5,3×10-6 (4,0×10-8)|
|Boiling point at which the vapor pressure is 1.33 Pa (1 × 10-2 mm Hg), ° С||140-150|