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Mechanical pump oils Edwards supplies the widest range of oils of different viscosities and specifications to enable customers to obtain the best performance from mechanical pumps under different application conditions. Mineral oils are manufactured by a hydro treatment process to reduce carcinogenic risk. All are specially prepared for high vacuum use, having low vapour pressures even at high temperatures. The particular mechanical pump specification should be consulted to find which oil to use.
Vapour pressure mbar 20°C
Vapour pressure mbar 100°C
Molecular weight
Specific gravity at 15 °C
Viscosity cSt at 20 °C
Viscosity cSt at 40 °C
Pour point °C
Flash point °C
Auto ignition point °C
Ultragrade 15
5.8x10-6
3.0x10-2
385
0.86
104.2
38.1
-18
220
355
Ultragrade 19
1x10-8
1.0x10-3
420
0.86
143.7
48.6
-16
220
355
Ultragrade 20
2.1x10-7
3.0x10-3
500
0.86
352
103
-12
220
365
Ultragrade 70
2.1x10-7
3x10-3
600
0.86
222
70
-12
230
360
Edwards TW
1.3x10-6†
-
430
0.86
155
65
-12
243
270
Fomblin® 06/6
4x10-6
5x10-3
1900
1.88
64
25
-50
none*
none*
Krytox® 1506
5.2x10-7
1.3x10-3
2400
1.88
70
22
-45
none*
none*
Fomblin® 16/6
3x10-6
1x10-3
2700
1.89
168
48
-45
none*
none*
Krytox® 1514
2.6x10-7
1.3x10-4
3500
1.89
140
48
-40
none*
none*
Fomblin® 25/6
4x10-8
6x10-5
3300
1.9
276
80
-35
none*
none*
Krytox® 1525
1.3x10-7
3.9x10-5
4600
1.9
250
80
-35
none*
none*
Ultragrade mineral oils
Edwards offers a range of mineral oils, Ultragrade 15, 19, 20 and 70, which result from a new process. Most manufacturers use a solvent refining process, whereas these oils are produced by a unique hydrotreating process. This process eliminates nitrogen, sulphur and oxygen and the aromatic hydrocarbons, leaving a clear base stock essentially free of impurities. When combined with additives, the Ultragrade oils give improved vacuum performance, thermal and oxidation stability and rust inhibition. The anti-oxidants included in the oils enable the pump to withstand high operating temperatures without oil degradation, so extending intervals between oil changes.
The properties of the oils allow them to be used in a wide range of applications. New Ultragrade 70 oils are the best choice for large pumps used in heavy-duty, cycling applications. Contact Edwards or your local supplier for detailed recommendations.
Ultragrade oil
Ultragrade 15
Ultragrade 19
Ultragrade 70
Ultragrade 20
Use in
E2M0.7, E2M1.5. Also suitable for cold start applications
RV pumps, E2M18, E2M28
E2M40 to E2M275
EH boosters
Spectroscopy magazine
Edwards TW
Edwards TW has been developed for applications where rotary pump oils are likely to be exposed to reactive or corrosive gases. The oil is distilled hydrocarbon containing no additives, but unsaturates and aromatic links have been removed. The result is that the oil will last up to 20 times longer, depending on process, than refined mineral oils. Longer oil life significantly extends the intervals between oil changes.
Edwards 45 oil
Edwards 45 is a hydrocarbon synthetic polymer whose molecular structure offers chemical inertness, high temperature stability and low vapour pressure (< 10-7 mbar at 25 °C). It is commonly used in mass spectrometry applications because of its well defined peaks. Edwards 45 oil is non-toxic, non-corrosive and reclaimable.
Perfluoropolyether Oils
Edwards now offers an extended range of Fomblin® and Krytox®, perfluoropolyether oils for use in rotary vacuum pumps. Fomblin® YVAC 06/6 and Krytox® 1506 are recommended for Edwards oil sealed rotary pumps and are practically a direct replacement for mineral oil in terms of viscosity and vapour pressure. Krytox® 1525 is suitable for use in rotary pumps requiring a viscosity equivalent to Fomblin® Y25 fluid. Fomblin® Y16/6 and Krytox® 1514 are recommended for use in perfluoropolyether adapted mechanical booster pumps. Edwards, in conjunction with Ausimont UK, has developed Drynert fluid which contains anti-rust and antiwear additives soluble in Fomblin®. These additives cover metallic surfaces with a protective, corrosion resistant film.
