Which pipe material is known for its high flexural strength and corrosion resistance?

The choice of ductile iron as the correct answer relates to its unique properties that make it suitable for various applications in water treatment and distribution systems. Ductile iron is known for its high flexural strength, which means it can withstand bending forces without breaking. This characteristic is particularly important in applications where the pipes may experience external loads or ground movement.

In addition to its strength, ductile iron exhibits excellent corrosion resistance, especially when treated with protective coatings or linings. This resistance is crucial for maintaining the integrity of the pipes in environments that may expose them to water, soils, and chemicals that could accelerate corrosion. The combination of strength and corrosion resistance makes ductile iron a preferred choice in scenarios such as wastewater management and potable water systems.

Other materials, like steel, may provide strength, but they are more prone to corrosion without protective measures. PVC, while resistant to corrosion, does not offer the same level of flexural strength as ductile iron. Concrete, on the other hand, tends to be strong in compression but is much less flexible and can be susceptible to cracking under certain circumstances.

In summary, ductile iron's high flexural strength and corrosion resistance make it an ideal choice for applications that require durable and reliable piping systems.