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DOWSIL™ 550 Fluid

100% actives, Polyphenylmethyldimethylsiloxane polymer fluid. Useful as heat transfer fluid, in thermostat systems and as a base oil for high-temperature lubricants.

DOWSIL™ 550 Fluid


  • Low volatility
  • Serviceable temperature range of -40°C up to 230°C in open systems, and up to 315°C in closed systems
  • Viscosity of 100-150mm²/sec at 25°C
  • High flash point
  • Excellent heat transfer characteristics
  • High viscosity index
  • Good compressibility
  • Good oxidation and thermal stability


  • As a lubricant:
    • Base oil for high-temperature ball bearing greases
    • Lubricating oil for high-temperature instruments
  • As a heat transfer medium:
    • Heat-treating baths for speciality metals
    • Heat exchange fluid for research apparatus and instrument calibration baths
    •  Heat transfer oil in capacitors, transformers and various electronics
  • As a thermostat fluid:
    • Suitable for temperatures from -40°C to 315°C in thermostat systems, which should be kept clean

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