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Description
Chemical Name: 1,1,3,5,5-Pentaphenyl-1,3,5-trimethylsiloxane
Other Names: 705 silicone diffusion pump oil, Phenylmethylsiloxane Oligomers, Oil for diffusion pumps
CAS No: 3390-61-2
Chemical Structure:
Silicone Diffusion Pump Oil TOPDA 705 is a colorless transparent oily, single-component fluid designed for ultrahigh vacuum applications in the range of 5x(10-9~10-10) torr (untrapped). The vapor pressure and backstreaming rate of TOPDA 705 is so low that the use of traps or refrigeration is unnecessary for some ultra-high and ultra-clean vacuum applications. It has the highest phenyl content of all silicone diffusion pump oils and the best resistance to radiation.
Features
- Qualified for all Diffusion Pump
- Chemically and thermally stable
- High radiation resistance
- High oxidation resistance
- High moisture resistance
- Low vapor pressure
- Excellent untimate vacuum performance
Technical Index
Item Unit Typical Value
Chemical composition
Pentaphenyl trimethyl trisiloxane
Ultimate Vacuum,
(untrapped)
torr 5x(10-9 to 10-10)
Saturated Vapor Pressure torr 5x10-10
Specific Gravity
g/cm31.09 ~ 1.10
Viscosity, 25℃ cSt 170~175
Viscosity, 40℃ cSt 61~64
Flash Point ℃ ≥243
Refractive Index nD251.555~1.588
Congealing Point ℃ ≤-14 ~ -18
* GC-MS Test Report is available.
Applications
Used as diffusion pump oils, compared with TOPDA 704, TOPD 705 has a better untimate vacuum performance.
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.
