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Description
Chemical Name: 1,1,5,5-Tetraphenyl-1,3,3,5-tetramethyltrisiloxane
CAS No: 3982-82-9
Other Names: 704 silicone diffusion pump oil, 704 high vacuum diffusion pump fluid, Oil for diffusion pumps 704
Chemical structure:
Silicone Diffusion Pump Oil TOPDA 704 is a colorless transparent oily fluid designed for high vacuum of 10-7~10-8 torr (untrapped). It performs well in tough, rugged applications and offers quick pump down, even after exposure to air at operating temperatures. TOPDA 704 is thermally and chemically stable allowing it to keep pump jets free of tars and hard carbon.
Features
- Qualified for all Diffusion Pump
- Chemically and thermally stable
- High radiation resistance
- High oxidation resistance
- High moisture resistance
- Low vapor pressure
- Fast pumping speed
Technical Index
| Item | Unit | Typical Value |
|---|---|---|
| Chemical composition | Tetramethyl tetraphenyl trisiloxane | |
| Ultimate Vacuum, (untrapped) | torr | 10-7 to 10-8 |
| Saturated Vapor Pressure | torr | 2x10-8 |
| Specific Gravity | g/cm3 | 1.06 ~ 1.07 |
| Viscosity, 25℃ | cSt | 38±3 |
| Flash Point | ℃ | ≥210 |
| Boiling Point | ℃ | 215 |
| Refractive Index | nD25 | 1.5500~1.5600 |
| Congealing Point | ℃ | -35 |
* GC-MS Test Report is available.
Applications
Used as diffusion pump oils, compared with TOPDA 705, TOPD 704 has quicker pumping speed and lower energy consumption.
Packing
Available in 1kg plastic bottles, 1gallon, 5kg, 25kg plastic drums or 200kg iron drums.
Tranportation & Storage
1. Transported as non-dangerous cargo.
2. The product should be stored in a shady, dry place with the temperature 0°C-40°C, freezing should be avoided.
3. Avoid from acid, alkali chemical materials and other impurities.
