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Reference Manual
00809-0100-4002, Rev BB
November 2012
5-3
Rosemount 1199
FILL FLUID
SPECIFICATIONS –
SILICONE
704
Silicone 704 Description
Silicone 704 is a silicone diffusion pump fluid for vacuum and high
temperature industrial applications. This specialty silicone fluid has a much
higher molecular weight than Silicone 200, which increases its operating
temperature and lowers its vapor pressure. Its main limitation is its higher
viscosity, and so heat tracing of capillaries is suggested for many outdoor
applications. The 0.03 in. (0.7 mm) ID capillary is not allowed for Silicone 704
because of its higher viscosity. Manufacturer states it neither represents or
tests this fluid for medical or pharmaceutical applications.
Temperature Limits
At Atm Pressure
0 to 315 °C (32 to 600 °F)
Max Temp at Min. Pressure
See vapor-pressure curve
Viscosity at 25 °C (77 °F)
39 cs
Specific Gravity @ 25 °C (77 °F)
1.07
Coefficient of Thermal Expansion
0.00095 cc/cc/C (0.00053 cc/cc/F)
Chemical Name
Tetramethyltetraphenyltrisiloxane
CAS Number
3982-82-9
Silicone 704 Vapor Pressure Results (ASTM E1782)
Содержание 1199
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