What are the two basic categories for plastic pipe?

The classification of plastic pipe into thermoplastic and thermoset categories is grounded in the distinct properties and behaviors of these materials when subjected to heat.

Thermoplastic materials are characterized by their ability to be melted and reshaped multiple times without undergoing any significant chemical change. This property provides great versatility in manufacturing, allowing for processes such as extrusion to create various types of pipe. Common examples include polyvinyl chloride (PVC) and polyethylene (PE), which are widely used in plumbing and drainage applications due to their flexibility, lightweight nature, and resistance to corrosion.

On the other hand, thermoset plastics are cured through a chemical process that forms a rigid structure. Once set, they cannot be remelted or reshaped; attempting to do so would result in degradation rather than reformation. This irreversible reaction imbues thermosets with enhanced thermal stability and strength, making them suitable for applications that require high performance under extreme conditions. Examples include epoxies and certain types of reinforced pipes.

Understanding the differences between these two categories is essential for selecting the appropriate type of plastic pipe for specific plumbing needs, as each offers unique advantages and limitations based on their thermal and mechanical properties.