New Mexico Pipe Fitter Journeyman (JPF) Practice Exam

What is the primary use of primer when working with solvent cement in pipe fitting?

1. To add color to the joint

2. To soften the joining surfaces

3. To strengthen the bond

4. To clean the surfaces

The correct answer is: To soften the joining surfaces

The primary use of primer when working with solvent cement in pipe fitting is to soften the joining surfaces. Primer is specifically formulated to prepare the surfaces of the pipes and fittings for the application of solvent cement. When applied, the primer chemically softens and enhances the surfaces, allowing the solvent cement to penetrate more effectively. This results in a more secure bond once the cement is applied and the joint is assembled. While there may be other factors at play in the joining process, the primary role of the primer is to facilitate the bonding process by ensuring that the pipeline surfaces are adequately prepared for a strong adhesion with the solvent cement. This preparation is crucial for achieving durable, leak-free joints in pipe systems.