What are the two types of glue commonly used for aircraft wood structure repair?

The two types of glue commonly used for aircraft wood structure repair are casein and synthetic resin. Casein glue, derived from milk proteins, has been historically used in aircraft wood construction due to its strong bonding properties and resistance to heat and humidity. It provides a durable adhesive that is effective in the structural assembly of wood components.

Synthetic resin adhesives, on the other hand, include types such as epoxy and polyurethane and are preferred for their superior strength, moisture resistance, and impact durability. These adhesives offer enhanced bonding capabilities for modern aircraft, particularly when dealing with composite materials and high-stress components.

By combining these two types of adhesives, aircraft restorers and manufacturers ensure that wood structures are repaired with materials that provide both traditional and contemporary benefits, making them suitable for various environmental conditions and operational demands.