What are the differences in moisture absorption between polyethylene and PVC?

Polyethylene and PVC are two widely used plastics with distinct properties, including their ability to absorb moisture. Polyethylene, a non-polar polymer, has low moisture absorption due to its hydrophobic nature, making it ideal for applications requiring water resistance, such as packaging and piping. In contrast, PVC (polyvinyl chloride) contains polar chlorine atoms, which slightly increase its moisture absorption compared to polyethylene. However, PVC's moisture uptake is still relatively low, and additives like plasticizers can further influence its behavior. Understanding these differences is crucial for selecting the right material for environments where moisture exposure is a concern. While polyethylene excels in waterproofing, PVC offers better chemical resistance and rigidity, balancing moisture absorption with other functional benefits.