What plumbing material is typically used for waste drainpipes?

PVC, or polyvinyl chloride, is the most common material used for waste drainpipes due to its excellent properties that make it suitable for this application. Its lightweight nature makes it easy to handle and install, and it is resistant to corrosion, which is vital for longevity when used with waste materials that can be highly corrosive. PVC is also known for its smooth interior surfaces, which reduce friction and allow waste to flow freely, minimizing the chances of clogs. Additionally, PVC is cost-effective, making it accessible for various plumbing projects.

While other materials like copper, steel, and polyethylene have specific uses in plumbing systems, they are not typically used for drainpipes. Copper is often used for water supply lines due to its durability and resistance to corrosion in water, and while steel is strong, it is more prone to rust when exposed to moisture. Polyethylene is used in applications like underground piping but is not commonly chosen for visible waste drainage systems.