New Mexico Pipe Fitter Journeyman (JPF) Practice Exam

Plastic metal pipe composition includes which elements?

1. Only metal on the outside

2. Laminated metal and plastic

3. Metal core between plastic layers

4. Pure plastic

The correct answer is: Metal core between plastic layers

Plastic metal pipe, often referred to as composite pipe, typically consists of a metal core that is sandwiched between layers of plastic. This design combines the strength and durability of metal with the corrosion resistance and lightweight properties of plastic. The metal core provides structural integrity and allows the pipe to withstand higher pressures compared to pure plastic pipes. The outer plastic layers offer protection against environmental factors and reduce the risk of corrosion that can occur with bare metal pipes. By incorporating a metal core between plastic layers, this type of pipe benefits from the desired properties of both materials. This composition is especially advantageous in various plumbing and piping applications where flexibility, durability, and resistance to various substances are required.