How does the resistance to environmental stress cracking vary among these plastics?
Environmental stress cracking (ESC) is a critical factor in determining the durability of plastics under mechanical and chemical stress. Among common plastics, high-density polyethylene (HDPE) exhibits moderate resistance due to its semi-crystalline structure, making it suitable for outdoor applications. Polyvinyl chloride (PVC) shows higher resistance to ESC because of its rigid molecular chains and additives like plasticizers. Polycarbonate, while strong, is more prone to ESC when exposed to certain solvents. Understanding these variations helps industries select the right material for harsh environments, ensuring longevity and performance. Testing methods like ASTM D1693 are often used to evaluate ESC susceptibility.
