Mechanical Pump Oils (Catalog F33)

F33

Mechanical Pump Oils

W

henever selecting mechanical pump fluids for use in

mass spectrometers, it is important to select the fluid

with the lowest vapor pressure. The vapor pressure

of the oil is important because it determines the ultimate vacuum

the pump can achieve. Lower vapor pressures will allow the user to

minimize backstreaming, significantly reduce pumpdown time and

maximize vacuum. The major mineral based oils used for rough

pumps in mass spectrometers include Inland 19, Invoil® 20, Inland

33 and Inland 45. Any of these pump fluids can be used in all

Edwards, Adixen, Welch and other mechanical rough pumps.

Inland 19

Invoil 20

Inland 33

Inland 45

Inland TW Fomblin YO6/6

Vapor

Pressure

3 x 10

-5

3 x 10

-6

1 x 10

-6

1 x 10

-7

1 x 10

-6

3 x 10

-6

(torr)

The selection of a specific grade of pump oil utilized depends on the

users needs including the mass range of the mass

spectrometer, the system cleanliness required, the sensitivity

required and the cost the user is willing to pay.

Inland 19

is the basic mineral oil used in most mass spectrometer

vacuum pumps. It has been engineered for use with all mechanical

vacuum pumps, providing for minimal backstreaming.

Invoil 20

is a better grade of mineral oil for use in mechanical

rough pumps. It has been distilled to remove the majority of the light

fractions present in the base oil. These light fractions represent

weak links in oil and tend to provide a source of attack for reactive

gases. In addition

they can easily migrate into the vacuum system

to increase mass spec background. Invoil 20 will provide for better

pumping efficiency, lower vacuum and longer vacuum pump life in

comparison to Inland 19 or similar oils.

Inland 33

is manufactured to enhance the oxidation resistance of

the fluid providing outstanding chemical stability.

The process also

provides a clear oil base virtually free of impurities. This oil is equiv-

alent to the P3 rough pump oil used in Pfeiffer pumps.

Inland 45

is the newest and best grade of oil for mechanical vac-

uum pumps for mass spectrometers. It is a highly refined and dis-

tilled pump oil which will provide for optimum vacuum levels and

minimal mass spectrometer background. It is recommended for

mass spectrometers such as high resolution instruments which

require the cleanest system, highest vacuum levels and optimum

pumping efficiency. This oil is now recommended for the Agilent

mass spectrometer systems.

Inland TW

mechanical pump fluid is specifically recommended for

applications where exposure to reactive or corrosive gases is

prevalent, such as electrospray and particle beam.

Fomblin PFPE

oils are non-flammable chemically inert fluids for

use in areas where there are high levels of oxygen or where

serious corrosion is a problem. This oil is identical to Krytox.

Several manufacturers recommend this pump fluid for uses such as

in the Agilent Particle Beam mass spectrometer.

Selection of Oils for Mechanical Rough Pumps

Vapor

Boiling

Pressure

Point

Viscosity

Pour

Flash

Fire

Density

@25°C

@.01 Torr

@40°C

@100°C

Point

Point

Point

@25°C

Product

(Torr)

(°C)

(CST)

(°C)

(°C)

(°C)

(gm/cc)

Reclaimable

Inland 19

3 x 10

-5

112

51

8.1

-15

213

244

0.86

No

Invoil 20

3 x 10

-6

127

58

8.5

-10

224

259

0.86

Yes

Invoil 21

3 x 10

-5

112

54

8.1

-15

213

244

0.86

No

Inland 45

1 x 10

-6

133

49

6.9

-59

268

288

0.83

Yes

Inland 77

1 x 10

-4

138

90

9.9

-9

257

291

0.87

No

Inland TW

<1 x 10

-6

158

56

8.9

-12

243

270

0.86

Yes

Inland HVTW

<1 x 10

-6

161

105.9

12.9

-12

249

277

0.86

Yes

Fomblin

6 x 10

-6

>250

22

4

-45

None

None

1.88

Yes

Y06/6

Fomblin

3 x 10

-6

>250

47

7.5

-40

None

None

1.89

Yes

Y14/6

Fomblin

3 x 10

-6

>250

54

8.6

-45

None

None

1.89

Yes

Y16/6

Fomblin

1 x 10

-6

>250

72.4

10

-35

None

None

1.89

Yes

Y25/6

Inland FF-10

1 x 10

-4

----

28.8

4.5

----

199

221

0.85

No

Inland 33

<1 x 10

-6

166

67

9.3

-10

247

275

0.86

Yes

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