What is Dielectric Grease – Applications and How to use it?

Dielectric grease assists in preventing arcing between electrical parts. Some people have wondered about the difference between dielectric grease with other types of grease. Is dielectric grease the same as silicone grease? Why should I use dielectric grease? These are some of the questions that could be ringing in your mind.

Dielectric grease is also known as tune-up grease. It is a silicone-based and non-conductive type of grease to protect electrical connectors from corrosion, moisture, and dirt. One of the popular dielectric greases to use is Permatex Dielectric Grease and CRC dielectric grease.

It disrupts electric currents’ flow, thus making it ideal for sealing and lubricating rubber parts of electric connectors. We shall discuss more dielectric fluid, its application, how dielectric grease is used, types of dielectric grease, and its difference from regular grease.

Dielectric Grease

How to Use Dielectric Grease

Dielectric grease is made by adding a thickener to silicone oil. It is waterproof and fireproof. Before using dielectric grease, it is good to know if it is an insulator. Thermal grease, which is also a thermal paste, is used to drain excess heat from the electrical circuit components, such as LEDs and transistors. When using dielectric grease, inflate it on the body or outer surface of the electrical part.

Ensure that the grease does not touch the path of electrical currents or where parts are connecting. This is because the grease is an insulator, and it disrupts the flow of currents. Therefore, it is recommended to use dielectric grease on surfaces of electrical parts where the currents are not passing.

When using dielectric grease for an automotive tune-up on a diesel or gasoline engine, start by applying a little grease at the end of a spark plug wire’s rubber boot and spread it only to cover the inside lip. This prevents high voltage electricity from flowing to the boot and leaking from the engine block. It also makes it less difficult to put the boot over the ceramic insulator. It creates a watertight seal around the spark plug, protecting the connection from dirt and water.

You can also use dielectric grease on pin connectors’ gaskets, mostly found in recreational vehicles and boats. Smear a little dab of dielectric grease on the gasket and, if possible, on both sides of the gasket. It would be best if you did this before you inserted the gasket into the connection.

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Dielectric Grease Applications

Dielectric grease is used in many applications, including high-energy ignition systems, bulb sockets, trailer electrical connectors, headlamp connectors, ignition coil connectors, battery terminals, and spark plug boots. This silicone-based grease is used in battery terminals to prevent corrosion and fusing.

In a high-energy ignition system, dielectric grease is used to prevent voltage leakage. You can also use it with other connectors and terminals such as heat shrink terminals, spades, rings, and butt connectors. Dielectric grease is often used on electrical connectors, especially the ones with rubber gaskets. In this case, it works as a sealer and non-conductive lubricant for the connector’s rubber parts. The dielectric grease spray enables you to meet parts that your fingers cannot reach.

Another wide application of this grease is in spark plugs and other high-voltage connections. Applying the dielectric grease on the rubber boot of the spark wire enables it to slide easily into the ceramic insulator. It seals the rubber boot and prevents it from getting stuck in the ceramic. Most spark plugs are used in high temperatures, and dielectric grease is made to withstand those high temperatures.

The other great use of dielectric grease is on gaskets of multi-pin connectors or rubber mating surfaces in truck and automotive engines. In this application, it acts as a sealant and lubricant for the connector’s non-conductive mating surfaces. However, it is not advisable to use the grease on the connector’s actual electrical conductive contacts.

dielectric grease on battery terminals

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Different Between Dielectric vs. Regular Grease

A major dielectric grease substitute is regular grease. Dielectric grease is quite different from regular grease right from its physical properties to where it is used. Most regular grease becomes weak and melts down when used in high-temperature applications. This is because they are made with low melting points. Dielectric grease, on the other hand, has high melting points and can be used on surfaces experiencing extreme temperatures.

Regular grease is also different from dielectric grease in terms of cost. Dielectric grease is more expensive compared to other types of grease. However, the advantages that come along with the grease are worth the cost. Unlike other greases, dielectric grease does not dissolve in liquids such as water, ethanol, mineral oil, and methanol. Therefore, it is ideal for both outdoor and marine applications.

The lubricating effect of dielectric grease is more compared to that of regular grease. Finally, some regular grease conducts electricity while dielectric grease is a non-conductor. Therefore, on top of lubricating and preventing corrosion, the grease also prevents fusing and arcing in terminals and electric connections.

Pros of Dielectric Grease

Dielectric grease has a lot of advantages, especially when used correctly. One of its major advantages is providing a seal on metal surfaces. When the grease is applied to metal parts of the electrical system, it protects them from rusting and corrosion. This grease withstands high temperatures, and thus it will maintain the seal up to a maximum of 500 degrees Fahrenheit.

Another advantage of dielectric grease is to protect plastics and rubber in electrical systems or computer chips from fire and other catastrophes. Dielectric grease reduces the wear of mating and connecting surfaces. The connecting surfaces, therefore, develop a layered coating that minimizes resistance and prevents oxidation.

This silicon-based grease also insulates the electrical system and prevents the buildup of the insulative oxide layer that increases signal loss and resistance. Dielectric grease is most important for multi-pin connectors, thus eliminating any short between the pins. It is used for lubricating engine components such as speedometer cables, distributor caps, and rotors.

Cons of Dielectric Grease

Although dielectric grease is beneficial, it can also be detrimental when applied incorrectly. The grease is non-conductive; thus, when used incorrectly, it can prevent current flow. If you fail to clean the conductor’s contact points after applying the dielectric grease, the current will not pass through.

Another disadvantage of dielectric grease can cause silicone rubber to melt after years of use. You should, however, not use dielectric conductors encased with silicone rubber. When using dielectric grease, you need to wear gloves and safety glasses. This grease can irritate the eyes and skin.

The grease produces formaldehyde when used at high temperatures and can irritate the respiratory system and eyes. Always consider under what temperatures you will use the grease before applying.

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What is dielectric grease, and why should I use it? YouTube Video

Frequently Asked Questions (FAQs)

Q. Is Vaseline Dielectric Grease?

Vaseline is not dielectric grease. The two are different in their structure and purposes. Vaseline is a petroleum jelly mainly used for lubrication. A major difference between the two is that Vaseline conducts electricity while dielectric grease is a non-conductor.

Unlike dielectric grease, which has high melting points, the melting points of Vaseline are low. Vaseline is mainly used to coat iron equipment and prevent them from corroding. Dielectric grease, on the other hand, is mainly used for sealing electric components and protecting them from rust and corrosion.

Q. Can I Use Dielectric Grease On Battery Terminals?

You can use dielectric grease on battery terminals to prevent corrosion and fusing. However, applying the grease wrongly will block any currents from flowing. Dielectric grease also protects the terminals from moisture and dirt.

You should not apply grease between the terminals since it will prevent a good connection and shorten the battery’s useful life. Dielectric grease is ideal for battery terminals since it is not affected by high temperatures.

Q. Is Silicone Grease The Same As Dielectric Grease?

Dielectric grease is a type of silicon grease. Silicon grease is made by mixing silicone oil with a thickener. The moisture becomes a white viscous paste, which is water and fireproof. The exact properties of silicone grease depend on the proportions and types of components that have been used.

Dielectric grease is silicone-based grease that repels moisture and prevents electrical connections from corroding. The grease is a non-conductor of electricity. You are therefore advised not to apply it on mating surfaces of electrical connection.

Q. Can Dielectric Grease Be Used On Circuit Breaker?

You can use dielectric grease on circuit breakers but with caution since not all parts should be greased. This should only be done in corrosive atmospheres. At times, the circuit breaker’s manual recommends that you lubricate some specific current-carrying parts on the breaker.

Some of these parts are bus stands, primary-circuit finger clusters, and main contacts. It would help if you were extra careful when deciding on what current-carrying components should be greased and those that should not. It is advisable to go through the circuit breaker manual to make sure you are lubricating the right components.

Q. Can I Use Dielectric Grease On O-Rings?

Dielectric grease is the best grease to use on O-rings. Lubricating O-rings is crucial in every assembling process. It prevents the O-rings from scuffing damage and abrasion. Dielectric grease keeps the O-rings safe since it acts as a lubricant and it is also waterproof.


I am confident that you can now explain what dielectric grease is, its uses, applications, pros, and cons. Dielectric grease is a great sealer and lubricant. It prevents arcing, adds insulation, and ensures longevity on electrical connectors. Always remember that this grease should only be used on surfaces where current is not passing less it will not allow current to flow between two electrical connections. Dielectric grease is ideal for automobile applications, electrical circuits, and motor industries. It has a high melting point, and thus it is the perfect grease to use in high-temperature applications.

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Hi There, I am R. Hasan Tito, a mechanic, and owner of this website. My friend and I created this website to share our knowledge, expertise, and experience with our fellow mechanics' community and car users. I am a specialist and certified automotive mechanic (Both Heavy Commercial and Private Cars). I have been working as a mechanic for over fifteen years. I worked for a long time at Global Rebound Automotive companies (Toyota, TATA, BMW, Nissan, TVs, and Others ) as a Mechanic and Mechanics Supervisor.

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