Which adhesive is named for bonding on contact without clamping under pressure?

Which adhesive is named for bonding on contact without clamping under pressure?

• A. Mastic
• B. Contact cement
• C. Construction adhesive
• D. Polyurethane

Answer: (B)

The main idea is an adhesive that forms a bond the moment the glued surfaces touch, so pressure clamps aren’t needed after sticking them together. That describes contact cement: you apply the adhesive to both surfaces, allow it to become tacky, then bring the pieces together and press. The bond forms on contact, which is why clamping isn’t required. Mastic is a softer paste used for tasks like tile or roofing and generally isn’t defined by instant contact bonding. Construction adhesive cures over time and may require clamping or at least a steady hold while it cures. Polyurethane expands as it cures and also typically needs some clamping or support during setting.

The main idea is an adhesive that forms a bond the moment the glued surfaces touch, so pressure clamps aren’t needed after sticking them together. That describes contact cement: you apply the adhesive to both surfaces, allow it to become tacky, then bring the pieces together and press. The bond forms on contact, which is why clamping isn’t required.

Mastic is a softer paste used for tasks like tile or roofing and generally isn’t defined by instant contact bonding. Construction adhesive cures over time and may require clamping or at least a steady hold while it cures. Polyurethane expands as it cures and also typically needs some clamping or support during setting.