Which term describes a sealant with low recovery and slow cure, typically used in glazing applications?

• A. Bond
• B. Butyl Rubber
• C. Ceramic coating/ frit
• D. Caulk

Answer: (B)

The key idea is recognizing the sealing material suited for glazing that emphasizes long-term flexibility and gradual setting. Butyl rubber sealants are used in glazing because they stay highly flexible over time and seal out moisture effectively. Their viscoelastic nature means they don’t rebound quickly after being deformed, which is described as low recovery. They also cure slowly, forming a durable seal without enabling rapid hardening. This combination—sticky, flexible, moisture-resistant, and slow to cure—is exactly what makes butyl rubber well-suited for sealing automotive glass and other glazing applications. In contrast, a bond is simply an attachment action, ceramic coating/frit relates to surface finishes on glass, and caulk is a broad term that doesn’t specifically capture the slow-cure, low-recovery behavior of glazing-specific butyl sealants.