FAQs
What makes DOWSIL 550 suitable for radiation environments?
DOWSIL 550 is a thermally stable, phenyl-containing silicone fluid that resists heat and radiation, which is why it is used for equipment in nuclear plants and similar settings. Combined with chemical inertness and low volatility, this resistance helps it maintain performance where radiation exposure is a critical concern.
What are its key physical properties?
Distributor technical data lists a kinematic viscosity around 125 cSt, a specific gravity near 1.06, and a flash point of roughly 101°C (214°F). These figures reflect its high-flash, low-volatility character. Always confirm the exact values for your grade against the current technical data sheet before design use.
Can DOWSIL 550 be used as a hydraulic or heat-transfer fluid?
Yes. It is used in hydraulic arrestors (snubbers) and hydraulically actuated valves, taking advantage of its compressibility, and it can also serve as a lubricant, heat-transfer medium, or thermostat fluid thanks to its low volatility and good heat-transfer characteristics across a demanding temperature range.
Why does the high flash point matter?
A high flash point (around 101°C per distributor data) means the fluid resists ignition at elevated temperatures, improving safety in hot or demanding environments. Together with low volatility, it helps the fluid stay stable and lose little material over time in high-temperature or enclosed equipment.
Is DOWSIL 550 chemically inert?
Dow describes the fluid as chemically inert, meaning it resists reacting with many surrounding materials, which supports long service life and reliable performance in specialized equipment. As with any fluid, confirm compatibility with your specific components and seals, and review the Safety Data Sheet before use.
