What is a key factor about cast iron pipe in modern usage?

Cast iron pipe has seen a decline in new installations due to a shift towards materials that offer enhanced durability, flexibility, and lighter weight, such as PVC or HDPE. This transition is largely driven by the need for more modern plumbing solutions that can better withstand environmental stresses and are easier to handle during installation. Although cast iron has excellent strength and can resist high pressures, its weight and susceptibility to corrosion make it less favorable in contemporary practices. This understanding reflects industry trends, indicating that while cast iron may still be present in older systems and some specialized applications, it is not prevalent in today's new pipeline installations.