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LS-644 Tetraphenyltetramethyltrisiloxane
CAS NO. 223-620-5
Silfluo LS-644 is 1,3,3,5-Tetramethyl-1,1,5,5-tetraphenyltrisiloxane, a tetraphenyl-modified trisiloxane fluid.
The molecule contains four phenyl groups and four methyl groups on a three-unit linear Si–O–Si–O–Si backbone.
The narrow molecular weight distribution and steep vapor pressure curve make it suitable as a diffusion pump working fluid for ultra-high-vacuum applications.
The tetraphenyl architecture provides thermal oxidation stability and chemical inertness under continuous pump operating conditions.
Used as diffusion pump fluid and as heat transfer or base fluid in high-temperature, high-vacuum, or radiation-exposed environments.
Performance equivalent to Dow DC-704 and Shin-Etsu HIVAC-F4.
