702, 704 & 705 + Dow Corning High Vacuum Grease
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 functionally equivalent products in gallon containers and 500 cc bottles. Ask for our MT-702, MT-704, or MT-705. All are in stock for immediate delivery.
702 Pump Oil
MT-702 diffusion pump fluid is a general purpose fluid designed for fast pumping of large volumes of gas. It is used to produce vacuums in the range of 10E-5 to 10E-7 torr. It is also used in vapor ejector pumps that attain vacuum of 10E-4 to 10E-5 torr.
Download MTS 702 SDS
704 Pump Oil
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.
Download MTS 704 SDS
705 Pump Oil
MT-705 diffusion pump fluid is a colorless to light straw, a single component for ultrahigh vacua in the range of 10E-9 to 10E-10 torr untrapped and 10E-11 torr trapped. The vapor pressure and backstreaming rate of MT-705 Diffusion Pump Fluid are low enough that the use of traps or refrigeration may not be necessary for all ultrahigh and ultraclean vacuum applications. It has the highest phenyl content of all silicone diffusion pump fluids, and hence, the best resistance to radiation. Additionally, MT-705 has a high spontaneous ignition temperature.
Download MTS 705 SDS
Dow Corning High Vacuum Grease
MTS still sells Dow Corning High Vacuum Grease. A 150 gram (5.3 oz.) tube is $30.
Check out our TIP Articles:
- What is a diffusion pump?
- How do diffusion pumps work?
- What are the differences in diffusion pump fluid types (hydrocarbons and synthetics)?
- Tips for Diffusion Pump
|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|
|Viscosity 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|
|Price per 500cc
|Price per gallon||$375.00||$475.00||$595.00|
Midwest Tungsten Service, Inc. has made every effort to verify the information presented on this page is accurate and reliable. It is the responsibility of the user, however, to determine fitness for use. DC 702 and DC 704 are products and trademarks of the Dow Corning Company.