Silicone Diffusion Pump Oil
Dow Corning® 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 vacuums of 10E-4 to 10E-5 torr.
Dow Corning® 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.
MTS also stocks private label 704 and 705 equivalents in gallon containers and 500 cc bottles.
MTS carries Dow Corning High Vaccum Grease. A 150 gram (5.3 oz.) tube is $25.00.
| SPECIFICATION | DC 702 | DC 704 |
| Molecular Description | Mixed phenylmethyl dimethyl cyclosiloxane | Tetramethyl tetraphenyl trisiloxane |
| Color | Water White | Light Straw |
| Ultimate Untrapped Vacuum (torr) | 10E-5 | 10E-7 to 10E-8 |
| Ultimate Trapped Vacuum | -- | to 10E-11 |
| Extrapolated Vapor Pressure at 25 ºC | 1 x 10E-6 | 2.1 x 10E-8 |
| Specific Gravity at 25 ºC | 1.07 | 1.07 |
| Viscocity at 25 ºC | 45 | 39 |
| Flash Point, open cup (ºC) | 193 | 221 |
| Boiling point, 0.5 torr (ºC) | 180 | 215 |
| Typical Boiler Temperature (ºC) | 190 | 220 |
| Heat of Vaporization (kcal/gm mole) | 21.7/190 ºC | 25.5/200 ºC |
| Surface Tension (dynes) | 30 | 37.3 |
| Molecular Weight | -- | 484 |
| Price per gallon (1-4 gals.) | $644.00 | $718.00 |
| Price per gallon (5+gals.) | $609.00 | $677.00 |
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.
You can reach us by e-mail at: mts@tungsten.com
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Midwest Tungsten Service 7101 S. Adams St. #6 Willowbrook, IL 60527 |
Toll Free: 1-800-626-0226 Phone: 1-630-325-1001 Fax: 1-630-325-3571 |