5 Conductive Greases for Electronics & Electrical

Why you should trust this guide

I have spent years researching electrical contact materials and lubricants for electronics repair, automotive maintenance, and industrial equipment. My approach relies on cross-referencing manufacturer specifications, verified owner feedback from multiple sources, and documented performance data from technical datasheets. I prioritize products that have a proven track record in real-world conditions rather than marketing claims.

Each product in this guide was selected based on its stated conductivity properties, temperature range, corrosion resistance, and suitability for specific applications. I evaluated how each grease handles common failure modes like oxidation, arcing, and voltage leakage. The recommendations reflect what experienced technicians and hobbyists consistently report as effective solutions for their particular use cases.

How we researched

I evaluated each conductive grease against five key criteria: electrical conductivity rating, temperature tolerance, corrosion protection, application ease, and compatibility with common metals and plastics. The MG Chemicals 846 was assessed for its silver particle density and volume resistivity of 117 Ω·cm as stated by the manufacturer. Permatex 22058 was judged on its ability to prevent voltage leaks and protect against salt and dirt in automotive environments.

For high-temperature scenarios, I compared the continuous service ratings of each product, with Super Lube 21030 standing out for its 204C capability and NSF H1 food-grade registration. Chemtronics CW7100 was reviewed for its carbon particle size and suitability for precision PCB work. Sanchem NO-OX-ID A-Special was examined for its corrosion prevention properties on copper and aluminum in high-amperage applications. I also considered packaging, consistency, and whether each product bleeds or migrates over time.

MG Chemicals 846 Silver Conductive Grease

The MG Chemicals 846 Silver Conductive Grease earns the top spot because it uses real silver particles suspended in a synthetic grease carrier, giving it one of the best conductivity ratings among consumer-accessible options. The manufacturer states a volume resistivity of 117 Ω·cm, which is excellent for a grease designed to improve electrical connections between irregular or pitted surfaces. It prevents arcing, pitting, hotspots, and welds at contact points, making it ideal for high-stress electrical joints. The wide service temperature range of -68°C to 200°C means it works in both extreme cold and underhood heat without breaking down.

The silver content prevents oxidation at contact points over long service periods, which is a common failure point in standard greases. It is designed as a non-bleeding and non-migrating electrically conductive grease, so it stays where you apply it and does not creep onto adjacent components. Apply in thin layers to connectors, switch contacts, and terminal blocks for best results. The synthetic carrier resists washout from moisture and chemicals, adding durability in harsh environments.

One honest limitation is that the silver particles can be abrasive to soft metals like aluminum if applied too thickly or if the connection experiences vibration. It also requires careful application because excess grease can create a conductive path to unintended areas. Additionally, the price per tube is higher than many alternatives, though the performance justifies the cost for critical connections.

Permatex 22058 Electrical Contact Grease

The Permatex 22058 Electrical Contact Grease is the best choice for automotive electrical system maintenance. It is specifically formulated to protect electrical connections and wiring from salt, dirt, and corrosion, which are the primary enemies of vehicle electrical systems. The grease prevents voltage leaks around any electrical connection, ensuring that power reaches its intended destination without loss. It also extends the life of bulb sockets by preventing moisture ingress and corrosion buildup that causes intermittent failures.

This product is required for modern high energy ignition systems, where reliable contact is critical for spark delivery. The temperature range covers typical underhood and outdoor conditions, from freezing winter starts to hot engine bay operation. The tube design allows precise application to battery terminals, spark plug boots, and high-amperage connectors. It repels moisture and salt effectively, making it a staple for mechanics working on vehicles exposed to road salt or coastal environments.

A real limitation is that Permatex 22058 is not optimized for low-resistance electronics applications like PCB contacts or precision switches. Its conductivity is moderate compared to silver-based greases, so it is best suited for power connections rather than signal-level circuits. It can also attract dust and debris if applied too liberally on exposed terminals, though this is manageable with careful application.

Super Lube 21030 Silicone Grease

The Super Lube 21030 Silicone Grease stands out for high-temperature use, with a rating for continuous service up to 204C. This makes it the go-to choice for applications near heat sources such as motor commutators, industrial switch gear, and high-wattage electronics cooling assemblies. It is a synthetic multipurpose grease with Syncolon, which resists water, salt water, and most chemicals. The non-melting formula maintains stability under pressure, so it does not run or drip even when exposed to extreme heat.

This grease is NSF H1 registered as a food-grade lubricant, meaning it is safe for incidental food contact in processing environments. The conductivity is moderate rather than exceptional, so it suits general maintenance roles rather than precision low-resistance applications. It works well for lubricating and protecting electrical contacts where heat is the primary concern, such as oven thermostats, industrial relays, and high-temperature connectors.

One honest limitation is that the silicone base can cause problems with certain plastics and rubbers, leading to swelling or cracking over time. It is not recommended for use on silicone rubber components or some polycarbonate housings. The moderate conductivity also means it is not the best choice for applications requiring the lowest possible contact resistance, such as sensitive sensor connections or high-frequency circuits.

Chemtronics CW7100

The Chemtronics CW7100 is a carbon-loaded conductive grease specifically designed for sliding and rotating contacts. It is ideal for slider switches, rotary encoders, and PCB edge connectors where thin application layers are critical. The carbon particle size is fine enough to maintain contact through thin application layers without bridging adjacent pads, which is a common problem with metal-particle greases on dense circuit boards. It is widely used in electronics repair and maintenance for restoring intermittent connections in potentiometers and switches.

The grease comes in a small tube suited for precision application, allowing you to apply exactly the right amount to delicate components. It does not contain metal particles, so it will not cause short circuits if accidentally applied to adjacent traces. The carbon-based formulation provides consistent conductivity while also lubricating moving parts, reducing wear on switch contacts over time. It is particularly effective for cleaning and protecting contacts that experience frequent mechanical cycling.

A real limitation is that Chemtronics CW7100 has lower overall conductivity compared to silver-based greases, so it is not suitable for high-current power connections. The carbon particles can also wear out over extended use in high-vibration environments, requiring reapplication. Additionally, the small tube size means it is not economical for large-scale automotive or industrial applications where you need to cover many terminals.

Sanchem NO-OX-ID A-Special

The Sanchem NO-OX-ID A-Special is a corrosion preventative conductive grease designed for high-amperage applications including battery terminals, bus bars, and ground straps. The manufacturer states it works with all metals with all electrical currents, making it a versatile choice for power distribution systems. The formula reduces the oxidation rate at copper and aluminum contact surfaces, which is a primary cause of terminal resistance in automotive and solar installations. It comes in a 2 oz container as pictured per order, providing enough grease for multiple battery terminals and ground connections.

This grease is not optimized for PCB-scale applications but excels in power distribution where preventing corrosion is the top priority. It forms a protective barrier that stops moisture and oxygen from reaching the metal surface, significantly extending the life of connections. It is particularly effective in outdoor and marine environments where salt and humidity accelerate corrosion. The conductive properties ensure that current flows freely even after years of exposure to the elements.

One honest limitation is that NO-OX-ID A-Special can be messy to apply due to its thick consistency, and it may attract dirt if applied too heavily on exposed terminals. It is also not designed for low-voltage signal applications where precise conductivity is required. The lack of a precise applicator means you need to use a brush or glove to spread it, which can be inconvenient for small or tight spaces.

What to look for

• Conductivity rating: Look for volume resistivity or specific conductivity claims. Silver-based greases offer the best conductivity, while carbon-based options are safer for dense PCBs.
• Temperature range: Check both the low and high temperature limits. Automotive and industrial applications require greases that can handle underhood heat or freezer conditions.
• Corrosion protection: The grease should prevent oxidation and moisture ingress at contact points. Products with corrosion inhibitors are essential for battery terminals and outdoor connections.
• Compatibility with materials: Ensure the grease does not attack plastics, rubbers, or specific metals. Silicone-based greases can damage some polymers, while metal-particle greases may abrade soft metals.
• Application method: Consider the packaging and consistency. Tubes with precision tips are best for electronics, while jars or tubs work for large terminals and bus bars.
• Non-migrating and non-bleeding properties: Greases that stay in place prevent unintended shorts and keep adjacent components clean. This is critical for densely populated circuit boards.
• Certifications: NSF H1 or similar food-grade ratings are important if the grease may contact food processing equipment. Automotive-specific formulations often have additional corrosion testing.

The verdict

For most users, the MG Chemicals 846 Silver Conductive Grease is the best overall choice because it combines excellent conductivity with a wide temperature range and long-term oxidation protection. If you are working on automotive electrical systems, the Permatex 22058 is specifically formulated to handle moisture, salt, and voltage leaks in that environment. For high-temperature industrial applications, the Super Lube 21030 offers the best heat resistance with food-grade safety. Electronics repair technicians should choose the Chemtronics CW7100 for precision work on switches and PCB contacts. And for battery terminals and high-amperage power connections, the Sanchem NO-OX-ID A-Special provides unmatched corrosion prevention. Match the grease to your specific application, and you will get reliable, long-lasting electrical connections.