By Santos Lopez
Naval UAVs operate in one of the most corrosive environments in modern aerospace. Constant exposure to salt fog, humidity and temperature fluctuations creates unique challenges for RF systems, especially at critical connection points.
Moisture ingress and corrosion can degrade signal integrity, damage components and ultimately lead to mission failure. Protecting these systems requires more than basic environmental sealing—it requires a clear understanding of how different sealing methods perform over time.
Two common approaches are IP67-rated sealing and hermetic sealing. While both provide protection, they serve different roles depending on the application and mission requirements.
Key Takeaways
- IP67-rated components protect against temporary immersion and surface exposure
- Hermetic seals provide gas-tight protection against long-term moisture ingress
- Saltwater environments accelerate corrosion in standard RF components
- Material selection plays a critical role in preventing long-term degradation
- Proper sealing strategy improves system reliability and service life
The Corrosive Reality of Naval UAV Operations
Saltwater environments introduce a constant presence of conductive, corrosive particles. Salt fog can settle on connectors and interfaces, accelerating oxidation and material breakdown.
Temperature changes during flight further complicate the issue. As UAVs climb and descend, pressure differentials can cause internal compartments to “breathe,” drawing in moist, salt-laden air through small gaps in seals.
Over time, this repeated exposure can lead to corrosion inside connectors and cable assemblies, even if external surfaces appear protected.
Understanding these environmental factors is essential when selecting RF sealing solutions.
When IP67 Sealing Is Appropriate
IP67-rated components are designed to protect against dust ingress and temporary immersion in water. They typically rely on gaskets or O-rings to create a seal between mating surfaces.
This level of protection is effective for external components that are exposed to splashes, spray or occasional submersion. It is commonly used for connectors and accessories that are accessible and can be inspected or replaced as needed.
However, gasket-based seals can degrade over time. Exposure to UV, temperature cycling and salt can cause materials to harden, crack or lose elasticity.
For applications where components are frequently maintained or replaced, IP67 sealing provides a practical and cost-effective solution.
The Advantage of Hermetic Sealing
Hermetic seals provide a higher level of protection by creating a completely gas-tight barrier. These seals are typically achieved through glass-to-metal bonding, which prevents the passage of moisture, air and contaminants.
Unlike gasket-based systems, hermetic seals do not rely on compressible materials that can degrade over time. This makes them ideal for protecting internal avionics bays and other sealed compartments that must remain dry throughout extended deployments.
Hermetic bulkhead connectors are often used where long-term reliability is critical and maintenance access is limited. By preventing internal contamination, they help preserve both electrical performance and system longevity.
IP67 vs. Hermetic Sealing: Key Differences
IP67 sealing is designed for environmental exposure, providing protection against water and dust at the surface level. Hermetic sealing, by contrast, is focused on preventing any ingress of gases or moisture over time.
Gasket-based seals offer flexibility and ease of installation but require periodic inspection and replacement. Hermetic seals offer long-term stability but typically involve higher initial cost and more specialized installation.
Choosing between the two depends on the operational environment, maintenance schedule and criticality of the protected system.
Selecting the Right Sealing Strategy for Naval UAVs
In naval UAV systems, different components may require different levels of protection.
External, serviceable components can often rely on IP67-rated sealing, especially when regular inspection and maintenance are part of the operational workflow.
Internal systems, particularly those that are not easily accessible, benefit from hermetic sealing. These components must remain protected from moisture ingress over long deployment cycles without relying on periodic maintenance.
A layered approach—using IP67 for external interfaces and hermetic sealing for critical internal pathways—can provide balanced protection across the system.
Installation Considerations for Saltwater Environments
Proper installation is just as important as component selection.
Material compatibility must be considered to avoid galvanic corrosion, which can occur when dissimilar metals are in contact in a conductive environment like saltwater.
Using appropriate gaskets, coatings or insulating materials can help mitigate this risk. Additionally, protective compounds and dielectric greases can extend the life of exposed connections.
Ensuring proper sealing, alignment and torque during installation helps maintain long-term performance and reliability.
Protecting UAV RF Systems in Harsh Naval Conditions
Maintaining reliable RF performance in naval environments requires careful planning and the right combination of protective strategies.
By understanding the strengths and limitations of IP67 and hermetic sealing, engineers can design systems that resist corrosion, prevent moisture ingress and maintain signal integrity over time.
This approach supports mission success while reducing maintenance demands and extending the operational life of UAV platforms.
L-com’s broad selection of wireless connectivity and networking solutions supports reliable UAV communications in demanding environments. For minimal downtime and rapid deployment, we ship quickly, with same-day shipping on qualified in-stock online orders placed Monday through Friday before 5 p.m. EST.
Frequently Asked Questions
Can IP67 sealing fully protect UAV systems in naval environments?
IP67 provides strong protection against water and dust, but over time, salt-laden moisture can penetrate gasket-based seals. For long-term protection, hermetic sealing is often required.
What makes hermetic seals more effective against corrosion?
Hermetic seals use glass-to-metal bonding to create a gas-tight barrier, preventing moisture and contaminants from entering sensitive components.
When should I use hermetic connectors in UAV design?
Hermetic connectors are best used for internal systems that require long-term protection and are not easily accessible for maintenance.
How can I prevent corrosion at connector interfaces?
Using compatible materials, protective coatings and proper installation techniques can help reduce the risk of corrosion in saltwater environments.
