What is the purpose of using primer in pipe jointing?

Using primer in pipe jointing serves the essential purpose of softening the surfaces of the pipe and the fitting, thereby allowing for better adhesion when solvent cement is applied. This process enhances the bond between the two surfaces, ensuring a secure and leak-free connection.

When primer is applied, it prepares the surfaces by cleaning and slightly dissolving the outer layer of the materials involved. This helps to eliminate dirt, grease, and other contaminants that could interfere with the bonding process. The chemical action that occurs when primer is used promotes stronger adhesion, which is crucial for maintaining the integrity of the joint under various conditions such as pressure and temperature fluctuations.

This choice highlights the importance of proper preparation in pipe jointing, which can significantly impact the performance and longevity of the plumbing system. While sealing and flow enhancement are critical aspects of pipe jointing, they are typically achieved through the use of appropriate adhesives and sealants rather than through the primer itself. Additionally, while coloring can help indicate different types of pipes or their intended use, it does not pertain to the functional purpose of primer in the jointing process.