What is DC-704 oil-Iota

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Service > What is DC-704 oil

What is DC-704 oil

Product Name: dowcorning 704 Dow Corning
Specification: Dow Corning
Packing:
DOW CORNING 704 diffusion pump oil
Summary
DOW CORNING 704 is a single component of oil, for 10-6-10-8 Torr and high vacuum 10-10-10-11 Torr. It is used in demanding applications difficulties very well, even after the temperature through the atmosphere at work can still provide rapid evacuation.
Type single-component silicone material
The physical form of the fluid
Characteristics of benzene content, chemically inert, no impurities, oxidation, radiation and explosion
The main purpose for the manufacture of 10-6-10-8 torr (no trap) and 10-10-10-11 Torr (with well) vacuum
Property
DOW CORNING 704 performance parameters
No ultimate vacuum trap 10-7-10-8 torr
There are well into 10-11
Inferred vapor pressure torr (25 ℃ when) 2 × 10-8
Specific gravity (25 ℃ when) 1.07
Viscosity cts (25 ℃ when) 39
Flash point ℃ (when open) 221
Boiling point ℃ (0.5 torr) 215
A typical furnace temperature ℃ 220
Surface tension dyne / cm 37.3
Vaporization heating Card / mol 25.2 (200 ℃)
Molecule type Tetramethyltetra-phenyltrisiloxane
Molecular weight of 484
Vapor pressure equation log10P = AB / T (P: vapor pressure, Torr; T: absolute temperature, ° K) A = 11.025B = 5570
Interest
DOW CORNING diffusion pump oil dedicate the following benefits:
Ø shorten the adjustment operation time is: A single-component silicone oil has reached the maximum capacity required shorter time than with a multi-component.
Ø Quick evacuation: silicone oil diffusion pump with working-level pressure before use of oil higher than 20-300%. Through higher capacity of the pump high-pressure end of the working area of the gas, can increase the heat input of 20 to 30%.
Ø minimal reflux: DOW CORNING single component vapor pressure of the silicone oil is very low, even for many applications, the existing well or wells refrigeration is not needed.
Ø long service life: thermal and chemical stability of the silicone oil is allowed to run for a long time without being deteriorated and contaminated.
Ø cleaning system needs less maintenance: steam pressure bulkhead at low temperature silicone leads mobility. And an oil discharge port surface of the heater to keep clean, silicone oil at the operating conditions effective to exhibit no decay or decomposition.
Ø faster circulation, reduce downtime, replacement demand for oil is less: at operating temperature after exposure to the atmosphere, the recovery rate of silicone oil faster than to have a lot of time. Since DOW CORNING silicone projecting oxidation resistance, hydrolysis resistance, there is no time to allow the vacuum pump to lift the time savings during the week.
Performance
Ø Radiation resistance: Due to high benzene content DOW CORNING diffusion pump oil, showing a good impedance for γ-ray radiation. DOW CORNING 704 diffusion pump oil in about 1800 Mrad of radiation so that the original viscosity doubled. The following table:
Exposure to radiation resistance in later Co60 source
Oil Species Dose pressure, Torr
Before exposure after exposure
There are oil DOW CORNING 704 100 Mrad 280 Mrad 2 × 10-62 × 10-6 1.1 × 10-53 × 10-6
Ø Seal Compatibility: at 70 ℃ immersion tests show butyl rubber and "VITON". Other materials such as rubber-like, the use of DOW CORNING diffusion pump oil pump seal is suitable. Oxidation in air and the impedance of the silicone oil at the operating temperature is not oxidized, it will not be hydrolyzed in the steam. Its chemical impedance gives it a long life and eliminates frequent replacement of oil. Fluid is inert, and not the metal components, such as hydrogen and carbon monoxide in the reaction gases.
Ø fast cycle period: The results of the test period showed no real ability to silicone oil change after 1000 cycles. In comparison with an organic resin obtained after 400 cycles with a vacuum of about 1% of silicone oil. In the test, a single-stage glass Knudsen diffusion pump and a vacuum gauge is a need to use. In each cycle, the operation of the pump 12 minutes after exposure to the atmosphere for 3 minutes. When exposed to the heater off, but left close to the operating temperature of the silicone oil. Test results are:
DOW CORNING 704 have oil
Number of pressure cycles, the number of cycles Torr pressure, Torr
0 2.3 × 10-6 0 2.0 × 10-6
994 3.0 × 10-6 107 3.5 × 10-5
2072 3.3 × 10-6 220 6.0 × 10-5
412 1.6 × 10-4

Ø explosion Impedance: Although high temperature ignition source and oxygen gas pump with a little fire and explosion hazards, diffusion pump silicone oil does not contaminate or become stable. This conclusion is drawn from the DOW CORNING test data, is based on the continuous pumping pure oxygen test conducted indicated, DOW CORNING diffusion pump oil has excellent anti-knock properties. The table below. Oxygen and oil vapor pump at a known pressure and temperature of the mixture, determined under a variety of compounds of this temperature will explode. The total pressure of the mixture is an atmospheric pressure.
Explosion impedance in pure oxygen pressure
Explosion Conditions
Oil seed chamber pressure ranges chamber temperature range of chamber pressure chamber temperature of the container temperature
DOW CORNING 704 40-734 torr 340-483 ℃ 455 ℃ 633 ℃ 300 torr 430 torr 429 torr 478 ℃ 267 ℃ 267 ℃ 269 ℃
Ø refluxed: in a vacuum chamber, the surface contamination is on the rate of the vapor pressure of the condensed film separator control

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