New Mexico Pipe Fitter Journeyman (JPF) Practice Exam

What are the two basic categories for plastic pipe?

1. Flexible and rigid

2. Thermoplastic and thermoset

3. Polyethylene and PVC

4. High-density and low-density

The correct answer is: Thermoplastic and thermoset

The two basic categories for plastic pipe are thermoplastic and thermoset. Thermoplastic materials can be melted and reformed multiple times, allowing for flexibility in manufacturing and repair processes. They return to their original state upon cooling and can be reshaped. Common examples include polyethylene and polyvinyl chloride (PVC). In contrast, thermoset plastics undergo a chemical change when they are heated and set into a permanent form, meaning they cannot be remelted or reshaped after they have been cured. This results in materials that are generally more rigid and heat-resistant, often used in applications requiring durability. Recognizing these two categories helps in understanding the properties, applications, and limitations of different types of plastic pipes. Understanding which category a specific pipe falls into is crucial for determining suitable usage in plumbing or industrial applications, including temperature resistance and flexibility requirements.