How does PVC’s resistance to hydrolysis compare to polypropylene in wet climates?

In wet climates, the resistance of materials to hydrolysis—a chemical breakdown due to water exposure—is critical for long-term durability. PVC (polyvinyl chloride) and polypropylene are two widely used polymers, but their performance in moist environments differs significantly.

PVC exhibits excellent hydrolysis resistance due to its hydrophobic nature and strong carbon-chlorine bonds, which repel water and resist degradation. This makes it ideal for applications like plumbing, outdoor fittings, and construction in humid regions.

Polypropylene, while also hydrophobic, has weaker carbon-hydrogen bonds, making it more susceptible to slow degradation over time in consistently wet conditions. However, it remains a popular choice for lightweight and flexible applications, such as packaging and textiles, where prolonged water exposure is less frequent.

For harsh, wet climates, PVC generally outperforms polypropylene in hydrolysis resistance, ensuring longer lifespan and structural integrity. Engineers and designers should consider these differences when selecting materials for moisture-prone environments.