What are the differences in elongation at break between PVC and polyethylene trash cans?

When evaluating the durability and performance of plastic trash cans, elongation at break is a critical mechanical property that distinguishes materials like PVC (Polyvinyl Chloride) and polyethylene. This measure indicates how much a material can stretch before fracturing, directly impacting resistance to impacts, cracks, and deformation in real-world use.

PVC typically exhibits an elongation at break ranging from 20% to 40%, making it relatively rigid and less flexible. While this rigidity provides structural stability, it also means PVC cans are more prone to cracking under sudden stress or extreme temperatures. In contrast, polyethylene—especially high-density polyethylene (HDPE)—offers significantly higher elongation, often between 100% and 1000%. This exceptional flexibility allows polyethylene trash cans to absorb impacts, resist shattering, and endure rough handling without permanent damage.

The difference stems from molecular structure: PVC’s linear chains with chlorine atoms create a stiffer matrix, whereas polyethylene’s simpler hydrocarbon chains facilitate chain sliding and stretching. For consumers, this means polyethylene trash cans are better suited for outdoor or high-impact environments, while PVC may be adequate for lightweight indoor applications. Ultimately, polyethylene’s superior elongation contributes to longer product lifespan and reduced waste replacement costs.