Temperature Limits:
At or above Atm Pressure: 0 to 315 °C (32 to 600 °F)
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
1.4.1 Description/applications
Silicone 704 is a fill fluid intended for use in applications with higher operating temperatures
beyond the maximum limit of Silicone 200.This specialty silicone fluid has a much higher
molecular weight than Silicone 200, which increases its operating temperature. Its main
limitation is its higher viscosity, so heat tracing of capillaries or use of the Rosemount Thermal
Ranger Expander 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.
For applications below 14.7 psia (1 bar-a) use Silicone 704 for Vacuum Applications found in
Section 1.5.
