仪器填充硅油Silicone 704 for Vacuum 真空填充油

Silicone 704 for Vacuum Applications – fill fluid

specifications

Temperature Limits:

Below Atm pressure: See Figure 1-2 for Vapor Pressure Curve

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

1.5.1 Description/applications

Silicone 704 for Vacuum Applications is specifically designed for applications below 14.7 psia

(1bar-a) that have higher operating temperatures than Silicone 200 for Vacuum Applications

can support. This specialty silicone fluid has a much higher molecular weight than Silicone 200,

which increases its operating temperature and lowers its vapor pressure. Its primary 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 for Vacuum Applications because of its higher viscosity. Refer to the

vapor pressure curve below for acceptable operating pressure and temperature limits.