Definition
An adhesive or chemical substance used to join two materials together by forming a strong, lasting connection between their surfaces. In aircraft construction and repair, bonding agents are used to attach metal, composite, rubber, or fabric components where mechanical fasteners (rivets, bolts, screws) are unsuitable or undesirable.
Plain English
A glue or chemical that sticks two parts together so they hold as one piece. In aircraft work, it replaces or supplements rivets and bolts when a smooth, strong, lightweight join is needed.
Context Anchor
Seen in aircraft maintenance and repair instructions, especially when parts must be glued, sealed, laminated, or patched.
Derivation
From the Old English 'bond,' meaning a tie or fastening, plus 'agent,' from Latin 'agere' (to do or act). A bonding agent is literally something that 'acts to tie things together.'
Why Pilots Care
A properly applied bonding agent maintains the structural strength of composite parts, directly affecting flight safety and airworthiness.
Intuition Check
Do not read “agent” as a person here. A bonding agent is the material that makes the surfaces attach to each other.
Example Sentence 1
The mechanic applied a bonding agent between the composite skin and the underlying support before clamping the assembly to cure.
Example Sentence 2
After curing, the bonding agent held the new skin section securely to the wing structure.