The Science Behind Tef-Gel
Tef-Gel, a brand name for a specialized polytetrafluoroethylene (PTFE) paste, was developed to address critical corrosion issues in the aerospace industry. Its unique formulation, which is 40% solid PTFE, creates a waterproof, non-volatile barrier between mating surfaces that effectively prevents common metal failures. Unlike petroleum-based lubricants that can wash away, Tef-Gel remains in place for years, offering consistent and long-term protection.
Inhibiting Galvanic Corrosion
Galvanic corrosion is an electrochemical process that occurs when two dissimilar metals are in electrical contact and exposed to a conductive electrolyte, such as saltwater. This process causes the more reactive of the two metals to corrode rapidly. Tef-Gel’s main function is to eliminate this process by preventing the electrolyte from entering the metallic interface. The dense PTFE paste fills microscopic voids, blocking the capillary action that would otherwise draw in corrosive agents. This effectively isolates the dissimilar metals and stops the destructive electrolytic current.
Preventing Seizing, Galling, and Friction Welding
In addition to preventing galvanic corrosion, Tef-Gel also serves as a high-performance anti-seize compound.
- Seizing and Galling: When stainless steel nuts and bolts are tightened, the pressure can cause the metal surfaces to stick together and seize. The PTFE in Tef-Gel acts as a friction barrier, creating a smooth layer between the threads that prevents abrasive wear and galling. This ensures that fasteners can be disassembled years later without damage.
- Friction Welding: In high-pressure applications, the friction between metal parts can cause them to weld together. The lubricating properties of Tef-Gel prevent this phenomenon, extending the life and reliability of the hardware.
Common Applications for Tef-Gel
Due to its robust and long-lasting properties, Tef-Gel is widely used in many industries and environments where corrosion and seizing are common problems. Some of the most frequent applications include:
- Marine: Essential for boats, where hardware is constantly exposed to corrosive saltwater. Applications include rigging screws, fasteners on towers and platforms, propeller shafts, steering wheels, and marine electronics connections.
- Aerospace and Aviation: Used for preventing corrosion and seizing on airframes and other components, leveraging its original design purpose.
- Industrial and Manufacturing: Applied in factory settings on pumps, gaskets, and other equipment where lubrication is required and exposure to chemicals or water is a concern.
- Automotive: Can be used on various components to prevent rust, seizing, and galling, extending the lifespan of parts.
- Electrical Connections: Though not an electrical insulator, it protects terminals and connectors from corrosion without increasing resistance, which prevents performance degradation.
Comparison: Tef-Gel vs. Other Lubricants
While several products offer anti-seize or anti-corrosion properties, their performance and composition can differ significantly. Below is a comparison table highlighting key differences.
| Feature | Tef-Gel (PTFE-based) | Lanocote (Lanolin-based) | Petroleum Grease | Silicone Lubricant |
|---|---|---|---|---|
| Primary Function | Anti-seize, anti-corrosion, anti-galling | Anti-corrosion, anti-seize | General lubrication, limited anti-corrosion | Waterproofing, general lubrication |
| Waterproof | Excellent; will not wash away | Good; provides a durable barrier | Poor; washes out easily | Excellent |
| Volatile Solvents | Contains 0% volatile solvents | Varies by formulation | High content; can evaporate | Can contain solvents |
| Metal Isolation | Creates a lasting electrical isolation | Creates a protective, temporary barrier | Limited barrier properties | Generally non-conductive, but not for dissimilar metal corrosion |
| Application Longevity | Long-lasting; does not dry out | Durable, but can break down over time | Short-term; requires re-application | Varies by application; may need re-application |
| Disassembly | Facilitates easy disassembly for years | Can make disassembly easier | Often difficult with corrosion | Can aid disassembly, but lacks corrosion focus |
| Food Grade | Yes, safe for incidental food contact | Generally not | Generally not | Yes, some are food grade |
Proper Application for Maximum Protection
For optimal results, Tef-Gel should be applied sparingly and evenly to clean surfaces. A thin coat is sufficient due to the high concentration of PTFE powder. The application process involves:
- Preparation: Ensure the surfaces are clean and free of old grease or rust. Mineral spirits can be used for cleaning.
- Application: Using a small brush, coat the threads of the fastener and the mating surface. For bolts, apply a thin line down the threads and spread it evenly.
- Assembly: Assemble the components and wipe away any excess product.
- Important Note: Tef-Gel is a preventative measure, not a cure. It should be applied before corrosion starts. It is also not compatible with most plastics, as it can cause embrittlement.
Conclusion
In summary, what is tef gel used for is a simple yet vital purpose: protecting metal hardware from the damaging effects of corrosion and seizing. Its PTFE-based, waterproof formula offers a long-term, reliable solution, particularly in marine environments where dissimilar metal contact and saltwater are a constant threat. From sailboat rigging to industrial equipment, Tef-Gel ensures that hardware remains functional and can be easily disassembled for maintenance, saving time and preventing costly replacements. While not a pharmaceutical product, its role in asset preservation and functional reliability is highly valued across various demanding industries. For more detailed application guidelines, refer to resources from marine and industrial suppliers.
