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Silicone Diffusion Pump Oil MY705

Silicone Diffusion Pump Oil MY705


1. 1,1,3,5,5-Pentaphenyl-1,3,5-trimethylsiloxane

2. 705 Super high vacuum diffusion pump oil

3. 705 Diffusion Pump Fluid

4. PhenylmethylsiloxaneOligomers

5. Oil for diffusion pump

CAS No.: 3390-61-2

Chemical structure:

Diffusion Pump Oil MY705 is a colorless transparent oily liquid, single-component fluid designed for ultrahigh vacuum applications in the range of 5x(10-9~10-10) torr (untrapped). The vapor pressure and the best resistance to radiation.

Technical Index:

Chemical composition: Pentaphenyl trimethyl trisiloxane

Ultimate Vacuum, torr(untrapped): 5x(10-9~10-10)

Saturated Vapor Pressure, torr: 5x10-10

Specific Gravity: 1.090 ~ 1.100

Viscosity (25°C), cSt: 170~175

Viscosity (40°C), cSt: 61~64

Flash Point °C: ≥243

Refractive Index 25°C: 1.5765-1.5785

Congealing Point °C: ≤-14 ~ -18

Molecular Description: 546


Diffusion Pump Fluid MY705 can be used in variety of applications, including.

Electrical and electronics industry

TV tubes, fluorescent tubes, cathode ray tubes

ordinary bulbs


rectifier metallised film vacuum system

Optical industry

surface improvements

anti reflective coatings

optical filters and mirrors

Metallurgy industry

high-vacuum furnaces

melting, degassing and sintering refractory metals; thick-film deposition.

Plastics industry

surface improvements

mirror coatings

protective coatings

film coatings

Other industries

processing metals and fuels


molecular plants

R & D plants

mass spectrometry


Be used as transmission fluid in high-temperature carriers and various instruments.

Package, Transportation & Storage:

1. Diffusion Pump Oil MY705 is available in 1kg plastic bottles, 1 gallon plastic drums, 5kg plastic drums,25kg plastic drums, 25kg Iron drums or 200kg Iron drums or IBC drums.

2. Transport as non-hazardous chemicals, keeping away from rain and sunlight.

3. Shelf life: 3 years.

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