Compressor Oils

Castrol Aircol PD 32


Air Compressor Lubricants


Castrol Aircol™ PD oils are a range of compressor lubricants, based upon highly refined mineral oils, which are
intended for the lubrication of both reciprocating and rotary air compressors.


Aircol PD grades are ashless oils recommended for the lubrication of rotors, bearings and gears in rotary compressors,
especially the oil flooded screw type with lubricant drain cycles of up to 2000 hours under normal use. Normal use in
screw type compressors is defined by a maximum air discharge temperature =/< 100°C as defined by ISO 6743-3:2003.

Aircol PD can be used for either normal or severe duty lubrication of reciprocating and rotary drip-feed air compressors,
as defined by ISO 6743.

Normal duty is described as:-

  • discharge temperatures =/< 165°C
  • differential pressures =/< 2.5 MPa (25 bar)
  • discharge pressures =/< 7.0 MPa (70 bar).

Severe Duty is described as:-

  • discharge temperatures > 165°C
  • differential pressures > 2.5 MPa (25 bar)
  • discharge pressures > 7.0 MPa (70 bar)

Aircol PD compressor oils exhibit low carbon forming tendencies and meet the requirements of the DIN 51506 VDL
classification for reciprocating compressors having air discharge temperatures up to 220°C.
Selection of the required viscosity grade should be based upon the compressor manufacturers’ recommendation.
However as a general guide Aircol PD 32 and 46 are suitable for oil flooded rotary compressors, whereas Aircol PD 68
and 100 would be selected for lubricating the crankcase and cylinders of reciprocating compressors. Aircol PD 150 is
recommended for sliding-vane compressors, or for reciprocating units at high ambient temperatures.

The Aircol PD range is fully compatible with nitrile, silicone and fluropolymer seal materials.
Aircol PD is classified as follows:

  • DIN 51506 classification – VDL
  • ISO 6743/3 – DAA and DAB for reciprocating air compressors, DAG for rotary air compressors

Aircol PD meets the requirements (for appropriate viscosity grade) of major compressor manufacturers such as Atlas Copco, Champion, Sullair, Compair/Broomwade, Ingersoll-Rand, Kaeser and Bauer.

  • Good water separation characteristics allows condensation to readily separate from the oil, minimising the risk
    of emulsions which could block the oil separator element.
  • Fully inhibited against corrosion which enables protection even when operating under humid conditions.
  • Good thermal stability, low volatility and low carbon formation reduces the risk of fire and explosion and leads to
    a longer operating life (up to 2000 hours).
  • Low deposit forming tendencies extends oil change intervals and provides longer air filter life which contributes
    to a reduction in maintenance costs.
  • Excellent coalescing properties mean little carry over of oil in the air stream.
Operating temperature Max. 220°C
Viscosity 32 mm/s² at 40°C
Viscosity index 97
Oil type Mineral
Product type Lubricating Oils
Applicable to these sectors Aerospace, Automotive Manufacture, Machinery, Metals, Mining

Castrol Aircol PD compressor oils are available in a wide range of viscosities, to suit different types of compressors
operating in varying ambient temperatures. Selection of the required viscosity grade should be based upon the
compressor manufacturers recommendations for the appropriate ambient temperature range, which will have been
chosen to provide the best compromise between maintaining a fluid film between the working surface and minimising
the amount of power absorbed by fluid friction in this oil film.


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