Common Diffusion Pump Fluids

Trade Name

Chemical Name

MW (Avg.)

P_v @ 25C (Pa)

Viscosity @ 25C (mm²/s)

Boiling Point (C)

Convoil® 20

Hydrocarbon

400

5x10^-5

80

190

OctoilS®

Bis (2ethylhexyl) sebacate

427

3x10^-6

18.2

141

Invoil®

Dioctylphthalate

390

3x10^-5

51

180

Dow Corning® 704

Tetraphenyltetra methyl trisiloxane

484

3x10^-6

38

220

Dow Corning® 705

Pentaphenyltri methyl trisiloxane

546

4x10^-8

175

250

Santovac 5®

Mixed 5Ring polyphenylether

447

6x10^-8

2400

275

Fomblin® Y VAC 25/9

Perfluoropolyether

3400

9x10^-7

190

180