Dow SYLTHERM 800

A Virtually Odorless, Long-lasting Heat Transfer Fluid

SYLTHERM* 800 fluid is a highly reprocessing problem associated with stable, long-lasting, silicone fluid with other heat transfer media. designed for high-temperature liquid-

phase operation. It has a recommended Performance operating temperature range of

-40°F (-40°C) to 750°F (400°C).
Operating continuously at the upper end of this range, SYLTHERM 800 fluid exhibits low potential for fouling and can often remain in service for 10 years or more. The fluid is essentially odorless and is low in acute oral toxicity. Silicone heat transfer fluids such as SYLTHERM 800 fluid are not listed as reportable under SARA Title III, Section 313.1

SYLTHERM 800 fluid features include:

Low fouling potential

• Low freeze point
• High-temperature stability
• Long life
• Noncorrosive
• Low acute oral toxicity
• Low odor
• Non-reportable under SARA

SYLTHERM 800 heat transfer fluid provides excellent high-temperature stability. It is capable of operating for more than 10 years at 750°F (400°C) without fouling or periodic

Performance

SYLTHERM 800 heat transfer fluid has an operational temperature range of -40°F (-40°C) to 750°F (400°C).

The maximum recommended film temperature is 800°F (427°C).

The silicone polymer structure is shown in Figure 1. Under operational thermal stress, the fluid undergoes very slow rearrangement of the silicone-oxygen bonds to assume a composition that remains stable at the required operating temperature and pressure. The rate of molecular rearrangement is directly related to the temperature and is depressed substantially because of the patented formulation. Systems using

SYLTHERM 800 fluid requires no periodic venting; therefore, the low-molecular-weight linear and cyclic siloxanes that result from the rearrangement remain part of the heat transfer media and do not cause system fouling. The rearrangement that occurs with SYLTHERM 800 heat transfer fluid is not a degradation reaction and does not affect fluid life.