Which of the following is a proper practice for solvent cement joints?

• A. Surfaces must be cleaned and dry before joining
• B. Thin cement before applying
• C. Apply cement unevenly around the joint
• D. Jump the joints after applying cement

Answer: (A)

Solvent cement joints rely on solvent welding, which needs a clean, dry surface so the cement can soften the PVC and fuse the parts. Dirt, oil, or moisture on the pipe or fitting creates a barrier that prevents bonding, leading to weak joints or leaks. Cleaning and drying both surfaces before assembly ensures the solvent can penetrate and form a strong, lasting bond.

Thin cement, applying cement unevenly, or moving the joint after applying cement can disrupt the bond, cause gaps, or misalignment, and weaken the joint. Proper prep and even application around the joint help achieve a reliable solvent weld.