DOWSIL 550 SILICONE FLUID
Harmonization Code : 3910.00.00.90 | Silicones in Primary Forms; Others
Main features
- Silicone Fluid Formulation
- High-Temperature Silicone-Fluid Stability
- Low-Volatility Silicone Fluid
Product Description
DOWSIL™ 550 Fluid is a 100% active polyphenylmethyldimethylsiloxane silicone fluid designed for high-temperature heat transfer, lubrication, and thermostat applications. The fluid combines low volatility, high flash point, and excellent oxidation and thermal stability, making it suitable for demanding operating conditions. It maintains stable performance across a wide temperature range and can be used as both a heat transfer medium and a base fluid for high-temperature lubricants.
Key features
- 100% active silicone fluid – Polyphenylmethyldimethylsiloxane polymer formulation.
- Wide service temperature range – Suitable from -40°C to 230°C in open systems and up to 315°C in closed systems.
- Low volatility – Helps maintain performance during extended high-temperature operation.
- Excellent heat transfer characteristics – Designed for efficient thermal transfer applications.
- Good oxidation and thermal stability – Suitable for elevated temperature environments.
- High flash point – Provides stability during high-temperature use.
- High viscosity index and good compressibility – Maintains consistent fluid performance over a broad temperature range.
Applications
DOWSIL™ 550 Fluid is used where high-temperature heat transfer, lubrication, and thermostat performance are required. Typical applications include:
- Heat transfer fluid: suitable for heat-treating baths for specialty metals, heat exchange fluids for research apparatus and instrument calibration baths, and heat transfer oil in capacitors, transformers, and various electronic equipment.
- Base fluid for grease: suitable as a base oil for high-temperature ball bearing greases.
- High-temperature lubricating oil: suitable for high-temperature instruments.
- Thermostat fluid: suitable for thermostat systems operating from -40°C to 315°C, provided the systems are kept clean.
TDS, SDS & Technical Documents
Technical Specifications
No specifications available.
Additional Information
DOWSIL™ 550 Fluid
DOWSIL™ 550 Fluid is a 100% active silicone fluid designed for high-temperature heat transfer, lubrication, and thermostat applications. The fluid provides excellent thermal and oxidation stability, low volatility, and efficient heat transfer performance across a wide operating temperature range. It is suitable for use in heat transfer systems, high-temperature lubricants, and specialty industrial applications requiring reliable thermal stability.
Serviceable temperature range of -40°C up to 230°C in open systems, and up to 315°C in closed systems
Review the technical data sheet and SDS before handling, processing, or qualifying the material.
High-Temperature Silicone Fluid for Heat Transfer and Lubrication
DOWSIL™ 550 Fluid is a 100% active silicone fluid designed for high-temperature heat transfer, lubrication, and thermostat applications. Its excellent heat transfer characteristics, low volatility, and good oxidation and thermal stability make it suitable for demanding applications requiring reliable performance at elevated temperatures
DOWSIL™ 550 Fluid can be used as a heat transfer medium in applications such as heat-treating baths, heat exchange fluids, capacitors, transformers, and various electronic equipment. It can also be used as a base oil for high-temperature ball bearing greases, as a lubricating oil for high-temperature instruments, and as a thermostat fluid for systems operating from -40°C to 315°C.
Key features
- High-temperature stability Provides reliable performance across a wide operating temperature range.
- Excellent heat transfer properties – Suitable for heat transfer applications including electronic equipment, capacitors, and transformers.
- Low volatility – Helps maintain fluid performance during high-temperature operation.
- Thermal and oxidation stability – Supports long-term performance in elevated-temperature environments.
- Lubrication capability – Suitable as a base oil for high-temperature greases and lubricating oils.
Processing summary
Performance Properties
Cure basis and test conditions are per technical data sheet unless otherwise stated.
| Property | Typical value | Unit |
|---|---|---|
| Viscosity at +99°C | 20 | mm2/s |
| Viscosity at +38°C | 84 | mm2/s |
| Viscosity at +25°C | 100-150 | mm2/s |
| Viscosity at -29°C | 22,000 | mm2/s |
| Viscosity-temperature coefficient | 0.76 | |
| Viscosity stability | <5% | |
| Flash point - open cup | >300 | °C |
| Freeze point | -50 | °C |
| Refractive index at 25°C | 1.4900-1.5000 | |
| Surface tension at 25°C | 24.5 | mN/m |
| Volatility 12 months/ 150°C | 4 | % |
| Volatility 12 months/ 200°C | 15 | % |
| Volatility 4 hours/ 250°C | 1.2 | % |
| Volatility 48 hours/ 250°C | 5.5 | % |
| Thermal gel time2 - months at 200°C | 14 | - |
| Thermal gel time2 - hours at 250°C | 1200 | - |
| Thermal gel time2 - hours at 260°C | 200 | |
| Thermal conductivity at 25°C, W/m.K | 0.13 |
Where DOWSIL™ 550 fits
Tips and troubleshooting
Frequently asked questions about DOWSIL™ CC-8030 UV RTV Coating
What is DOWSIL™ 550 Fluid used for?
DOWSIL™ 550 Fluid is used as a high-temperature lubricant, heat transfer medium, and thermostat fluid. Typical applications include high-temperature greases, lubricating oils for instruments, heat transfer systems, capacitors, transformers, electronic equipment, and thermostat systems.
How does this coating cure?
DOWSIL™ 3-1944 RTV Coating can be applied through brush, flow coat, or needle/dispense. It cures by atmospheric moisture at room temperature. Mild heat can be used to accelerate processing after sufficient solvent flash-off.
Which application methods are supported?
DOWSIL™ 550 Fluid may be used as a heat transfer oil in capacitors, transformers, and various electronic equipment where thermal management is required.
What temperature range can DOWSIL™ 550 Fluid operate in?
DOWSIL™ 550 Fluid offers excellent heat transfer characteristics, low volatility, good oxidation and thermal stability, and a high flash point for high-temperature applications.
