Apiezon AP303 Turbo Pump Oil

What is Apiezon AP303 oil?

Manufactured from high quality polyol ester base stock AP303 oil is a robust and proven lubricating oil for use in turbomolecular pump bearings.

It offers a range of benefits, including excellent lubricity and long service life with a wide operating temperature range suitable for continuous use at typical turbo pump operating temperatures.

AP303 also has low vapour pressure, meaning that it will not readily evaporate in operation.


What are the properties of Apiezon AP303 oil?

AP303 is a proven and robust lubricating oil. Manufactured from a high quality polyol ester base stock it:

  • provides excellent lubrication
  • is a robust liquid which offers a long service lifetime
  • exhibits a low vapour pressure of 3.1 x 10-7 Torr at 80°C
  • is silicone and halogen free
  • is easy to clean and remove during servicing as it is soluble in hydrocarbon solvents
  • Available to buy in 1 litre containers.


AP303 Turbo Pump Oil Typical Properties:

Typical Property Unit Test Method AP303
Colour HU ISO 2211 125
Density at 20°C kg/dm3 ISO 3675 0.97
Kinematic Viscosity at 40°C mm2/s ISO 3104 29
Kinematic Viscosity at 100°C mm2/s ISO 3104 5.3
Viscosity Index - - 116
Flash Point °C ISO 2592 260
Pour Point °C ISO 3016 <-50
RPVOT min ASTM D2112 397
4 Ball Wear Scar Diameter mm ASTM D4172 0.72
Vapour Pressure @ 80°C Torr - 3.1x10-7

When should I use Apiezon AP303 oil?

AP303 is used in turbomolecular pumps with conventional bearings which require a high grade lubricant with low vapour pressure. High-speed bearings such as these, with a low bearing load, require oil with a low viscosity.

AP303’s polyol ester formulation provides excellent lubricity along with good resistance to ageing, which provides a long service life. It is advised to degass the turbo oil before use to shorten pumping time and prevent foaming.

To find out more about Apiezon oils or the Apiezon family of silicone-free high vacuum greases manufactured by M&I Materials Ltd, contact our team of experts available via our helpline and online.


Vapour Pressure Graph of AP303 Oil

Apiezon AP303 FAQs

Q: How do I clean Apiezon AP303 turbo pump oil?

A: When servicing of pump bearings is carried out, AP303 is easily removed by washing away with warm soapy water or by using any aromatic hydrocarbon solvent (toluene, xylene). For a more environmentally friendly solvent, we recommend Limonene. AP303 is not soluble in alcohols (ethanol, IPA) or ketones (acetone, MEK) so these are not effective for cleaning.

Where to Buy:

Ask Apiezon

CALL: +44 (0)161 864 5409

Ask Apiezon

CALL: +44 (0)161 864 5409

Technical Data Sheet


Safety Data Sheet (SDS)