What is Contact Grease?

Contact grease is a special type of grease used in electrical contacts.  Contact grease serves to protect the contact surfaces from corrosion.  Contact grease are usually silicone based.  Contact greases are used in all types of electrical contacts ranging from electronic contacts to high voltage switchgear. 
Electrical contacts come under chemical attack from chemical fumes in the industries, from battery acid, moisture, etc.  This results in the formation of oxides or sulphates on the surface of the contacts.  This reduces the conductivity and damages the contacts eventually leading to failure.  

Contact greases work by providing a protective film over the contacts.  Contact protection can come in the form of greases or in the form of aerosols which can be sprayed on to the surfaces.