What is the purpose of 'bond line' in windshield installation?

• A. The bead of adhesive around the windshield perimeter that bonds the glass to the vehicle.
• B. A line on the glass used for cutting
• C. A gap between windshield and frame
• D. A seam for decorative trim

Answer: (A)

The bond line is the continuous bead of structural adhesive placed around the edge of the windshield. It is designed to create a strong, unified bond between the glass and the vehicle’s frame, so the windshield can act as part of the vehicle’s overall structure. This adhesive layer transfers loads from road impact and wind forces, helps keep the windshield in place during a crash or airbag deployment, and also provides a weather-tight seal to prevent leaks and wind noise. The bond line must be applied evenly and inspected for proper curing; gaps, contamination, or an improperly sized bead can weaken adhesion and compromise safety.