What kind of adhesives are most commonly used in laminated wood structures for aircraft?

Phenolic or epoxy adhesives are the most commonly used adhesives in laminated wood structures for aircraft due to their excellent strength and durability characteristics. These adhesives are highly resistant to moisture, heat, and chemicals, which is critical in the aviation industry where materials must withstand various environmental stresses.

Phenolic adhesives provide a strong bond and are particularly valued for their high-temperature resistance, making them suitable for components that may be exposed to extreme conditions. Epoxy adhesives also offer impressive bonding capabilities, flexibility, and resistance to aging, making them ideal for structural applications in aircraft.

In contrast, while polyurethane and water-based adhesives serve specific purposes, they may not provide the same level of performance in terms of long-term durability and structural integrity required in aviation applications. Silicone-based adhesives, while flexible and used in certain sealing applications, are not typically utilized for the primary bonding of laminated wood due to their lower bond strength compared to phenolic or epoxy options.