In composite repairs, what type of adhesive is commonly used as a lightweight splice material for honeycomb core sections?

In composite repairs, particularly when dealing with honeycomb core sections, foam adhesive is commonly employed as a lightweight splice material. The properties of foam adhesives make them ideal for use in structural applications, particularly in aerospace where weight is a critical factor. Foam adhesives provide the necessary bond strength while maintaining a low density, which is essential for minimizing the overall weight of the aircraft.

Additionally, foam adhesives can conform well to irregular surfaces found within honeycomb structures, ensuring that a strong bond is achieved across the entire spliced area. They also tend to allow for better load distribution due to their structural characteristics, contributing to enhanced durability and performance of the composite repair.

In contrast, while epoxy is a well-known adhesive in composite repairs and offers strong bonding characteristics, it may not always be the best choice for applications specifically requiring a lightweight solution like that of honeycomb core sections. Other options such as polyurethane and acrylic adhesives, while usable in different contexts, do not match the properties and performance benefits that foam adhesives provide in this specific application.