Product name:Ultra-High Vacuum Silicone Diffusion Pump Fluids

Product code:NV-SIPH-VP705

Chemical Information

Main components: Pentaphenyl Trimethyl Trisiloxane

Cas no.: 3390-61-2

Molecular structure: C₃₃H₃₄O₂Si₃

     CH3     C6H5     C6H5

        |          |           |

CH3-Si - O - Si  - O - Si-CH3

       |          |           |

    C6H5     C6H5    C6H5

Product Description

NV-SIPH-VP-705 is the ultimate-performance, single-component phenylmethylsiloxane fluid engineered for ultra-high vacuum (UHV) applications. By substituting an additional methyl group with a heavy phenyl ring compared to the 704 structure, NV-SIPH-VP-705 delivers the absolute lowest saturated vapor pressure and highest thermal stability available in silicone fluid technology.This ultra-pure fluid minimizes back-streaming to negligible levels, allowing untrapped vacuum systems to reach pressures down to 10-9 Torr, and trapped systems down to 10-10 Torr. It is primary-choice fluid for clean-room, ultra-clean chamber environments where carbon or silicone contamination on critical targets must be strictly eliminated.

Typical propertes:

Appearance: Colorless to pale straw-colored, clear liquid

Viscosity (@ 25℃): 165 - 185 cSt

Specific Gravity(@ 25℃):1.090 - 1.10

Flash Point ≥245℃

Pour Point: -14 to -18℃

Ultimate Vacuum: ≤ 3.1*10-9 Torr

Refractive Index(@ 25℃):1.5765-1.5785

Key Benefits & Features

Ultimate High Vacuum: Capable of achieving 10-9 to 10-10 Torr ranges required for advanced scientific and aerospace research.

Ultra-Low Back-Streaming: Extremely low volatility at operational limits ensures target substrates stay completely pristine during coating.

Maximum Phenyl Shielding: Possesses the highest oxidative resistance profile among all commercial silicone diffusion pump oils.

Radiation Resistance: Highly stable under severe high-energy particle and radiation environments.

Applications

Advanced Thin-Film & Semiconductor Processing: Critical optical lenses, semiconductor PVD/CVD coatings, and high-yield electronic components.

Analytical Instrumentation: Essential fluid for high-resolution mass spectrometers, electron microscopes, and surface analysis equipment.

Aerospace & Quantum Physics: Used in space simulation chambers, particle accelerators, plasma physics labs, and ultra-clean research environments.

Handling & Storage:

Fluid requires slightly higher heater inputs due to increased viscosity. Verify pump heating configurations before commissioning.

Store in a cool, dark, dry warehouse away from direct chemical fumes.

Shelf Life: 60 months from the date of manufacture when stored in original, unopened packaging.