Which adhesive is recommended for replacing a bonded side view mirror glass?

• A. Epoxy
• B. Silicone
• C. Urethane
• D. Cyanoacrylate

Answer: (C)

Replacing a bonded side view mirror glass needs an adhesive that can form a sturdy bond to both glass and the mirror housing while handling a lot of vibration and temperature changes. Urethane fits this need because it bonds well to glass and common backing materials, and it stays tough yet slightly flexible. That flexibility helps absorb shocks and the stress of heat and cold without cracking or pulling away. Epoxy tends to be very rigid and can crack with temperature shifts; cyanoacrylate is fast but brittle and not reliable for a large, vibration‑prone surface; silicone can be flexible but often doesn’t offer the strongest or most durable bond for automotive mirror assemblies. So urethane provides the best balance of strength, durability, and resilience for bonded mirror glass.