Which application is an injection seal mainly used for?

The correct application for an injection seal is primarily for structural gaps. Injection seals are specifically designed to fill and seal gaps in various structures, preventing fluid leaks, and protecting against environmental factors such as moisture and contamination. This is particularly important in aerospace applications where maintaining structural integrity is crucial for safety and performance.

In contrast, other options such as fuel tanks, windshields, and cockpit interiors typically require specialized seals or adhesives that cater to the specific demands of those applications, including resistance to fuels, impact protection, or aesthetic finishes. Therefore, the use of injection seals is most appropriate for addressing structural gaps where flexibility and resilience against movement or expansion are necessary.