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DOWSIL 550 Fluid also known as Dow Corning 550 Fluid is a Polyphenylmethyldimethylsiloxane fluid for use as lubricant, heat transfer fluid and thermostat fluid.
 
 
Applications:
As a lubricant:
 - Base oil for high temperature ball bearing greases. 
 - Lubricating oil for high temperature instruments. 
 - Impregnating oil for sintered bronze bearings in small electric motors and mechanisms exposed to high ambient temperatures. 
 
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.
 
Features:- Low volatility 
 - Serviceable temperature range of -40°C up to 230°C in open systems and up to 315°C in closed systems 
 - Low viscosity of 125mm²/sec at 25°C 
 - High flash point 
 - Excellent heat transfer characteristics 
 - Flat viscosity temperature curve 
 - Good compressibility 
 - Good oxidation and gumming resistance