Which statement best describes the binding process for contact adhesives due to their initial bonding capabilities?

• A. are cured before bonding
• B. are installed on both surfaces to be bonded
• C. require heat activation
• D. are applied to a single surface

Answer: (B)

The key idea is that contact adhesives rely on adhesive films on both surfaces to form an immediate bond when they touch. You apply the adhesive to both surfaces and let it develop a tacky film. When the two prepared surfaces are pressed together, the tacky layers meet and grab each other, producing an instant bond across the interface. That’s why coating both surfaces is essential.

If only one surface were coated, there wouldn’t be adhesive on the other side to create a full, strong bond at the interface, so the connection wouldn’t form as quickly or securely. Unlike certain adhesives that cure before bonding or require heat activation, contact adhesives achieve their initial bonding right on contact due to the tacky, interfacial films formed on both surfaces.