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.