Topic: Using dielectric grease?

[Bailgang]

I'm very naive regarding electronics so please excuse my dumb question but one subject that keeps popping up that has me wondering is just what exactly is the proper use of dielectric grease? I understand using it around electrical connections to help seal the connection like say around spark plug boots but I've seen or read so many times where it is applied to the actual connection itself and that's the part that confuses me. The reason why is because isn't dielectric grease electrical insulating meaning it doesn't conduct electricity? And if so than isn't applying it to the actual electrical connection the very last thing you'd want to do because all it would do is make that connection that you just cleaned up have even more resistance after you put the dielectric grease on it? Somebody please fill me in.

[HotCarl73]

i use it on actual connections. the way i understand it, it scrapes the grease off the actual connection, leaving everything else except the actual metal to metal covered in grease. i'm no expert, but that's how i figure it.

[RAFster122s]

It prevents or reduces oxidation and corrosion.  The mechanical connection for the electrical connection will wipe away any dielectric grease for that connection and will not stop the electrical connection if the connector is in good shape.


It is useful for rubber boots to prevent them from sticking to the ceramic of the plug and also serves to help  the rubber boot to seal so dirt and water doesn't have issues...

[D-Ral]

What he said. It doesn't actually improve the connection directly. There is another product for that usage.

[Bailgang]

Learning something new is cool. 

[TwoTired]

Our connectors are not gas tight, and the contacts aren't plated with noble metal impervious to the impurities and gasses in the atmosphere.  This means the metals near the actual contact points of the connector can oxidize, and as the oxidation grows, it can creep between the contact points.  As the contacts slide together it displaces the grease, assuming the contact pressure is correct for the design.  The remaining grease acts as a barrier to separate the atmospheric  oxygen, humidity, and air born impurities from reacting with the metal bits.  If it is silicone grease, it will repel water, too.

[bytio]

What he said. It doesn't actually improve the connection directly. There is another product for that usage.

D-Ral, what is the other product tat helps the connection?

[2wheels]

If you want to improve the electrical connection use this.
Stabilant 22A
http://stabilant.com/sizes01h.htm

It is very expensive though.