 Silicone
Fluid 274#,275# for high vacuum
diffusion pump
Technical
Information
1.Molecular
formula:
- 274# : CH3-Si(C6H5)2-O-Si(CH3)2-O-Si(C6H5)2-CH3
- 275# : CH3-Si(C6H5)2-O-Si(C6H5)(CH3)-O-Si(C6H5)2-CH3
2.Technical Data:
Items |
275# |
274# |
| Viscosity (25oC),mm2/s
Diopter (25oC)
Specific Gravity
Flash Point, oC
Condensation Point, oC
Minimal Vacuum Level, Pa |
165 ~ 185 1.5765 ~ 1.5785
1.090 ~ 1.100
min. 243
max. -14
max. 7 X 10-7 |
40 ~45 1.5500 ~ 1.5600
1.060 ~ 1.070
min. 210
max. -38
max. 1 X 10-5 |
| Color (Pt-Co
Method by Eye) |
max. 40 |
max. 40 |
3.Properties and
Applications:
It possesses excellent
heat-stability,good resistance to oxidation and radiation.Its saturation vapour pressure
is very low under room temperature,and changes sharply with the variation of
temperature.The minimal vacuum level can reach 10-9mmHg ,so the fluid is most
suitable to be used in High Vacuum Diffusion Pump.It is wildly used in High Vacuum
Diffusion Pump of electronic industry, metallurgic industry,instrument manufacture
industry,and also widely used as transmission liquid and heat-carrier at high temperature
in instruments.
4.Transportation:
Transport as non-hazardous chemicals,keeping away
from rain and sunlight.
Shelf life: 2 years.
It still can be used after being tested and qualified when exceeding the shelf life..
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Research Institute of Chemical Industry (Int'l-trade
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