MT-704 Diffusion Pump Oil - One Gallon | High Vacuum | Dow Corning Equivalent

Description

MTS Offers 702, 704 & 705 Pump Oil & Dow Corning High Vacuum Grease
This listing is for our MT-704 diffusion pump oil.
Dow Corning no longer offers DC-702, DC-704, and DC-705 for sale to the general market. Midwest Tungsten has filled the gap by offering private label 702, 704, and 705 chemically equivalent products in gallon containers and 500 cc bottles. Our MT-702, MT-704, and MT-705 are all in stock for immediate delivery.
MT-704
diffusion pump fluid is a single component fluid for high vacuums of 10E-6 to 10E-8 torr, untrapped or 10E-10 to 10E-11, trapped. It performs well in tough, rugged applications and offers quick pumpdown, even after exposure to air at operating temperatures, although this is not recommended.  Replacement for and equivalent to Dow Corning DC-704. Sold as DS-704 and Invoil 704 elsewhere.
MT-702 and MT-705 are available in separate listings.
SPECIFICATION
MT-702
MT-704
MT-705
Molecular Description
Mixed phenylmethyl dimethyl cyclosiloxane
Tetramethyl tetraphenyl trisiloxane
Pentaphenyl trimethyl trisiloxane
Color
Clear
Light Straw
Clear/Light Straw
Ultimate Untrapped Vacuum (torr)
10E-5
10E-7 to 10E-8
5 E-9
Ultimate Trapped Vacuum
–
to 10E-11
to 10E-11
Extrapolated Vapor Pressure at 25 ºC
1 x 10E-6
2.1 x 10E-8
5 x 10E-10
Specific Gravity at 25 ºC
1.07
1.07
1.09
Viscocity at 25 ºC
45
39
175
Flash Point, open cup (ºC)
193
221
243
Boiling point, 0.5 torr (ºC)
180
215
245
Typical Boiler Temperature (ºC)
190
220
260
Heat of Vaporization (kcal/gm mole)
21.7/190 ºC
25.5/200 ºC
28.2/250 ºC
Surface Tension (dynes)
30
37.3
36.5
Molecular Weight
–
484
546
Price per gallon
5.00
5.00
5.00