How does polyethylene handle moisture compared to polypropylene?

Polyethylene and polypropylene are two widely used polymers, each with distinct properties that make them suitable for various applications. One key difference between them lies in how they handle moisture.

Polyethylene is known for its excellent moisture resistance. It is hydrophobic, meaning it repels water and does not absorb moisture easily. This property makes polyethylene ideal for applications where exposure to water or high humidity is common, such as in packaging, water tanks, and outdoor equipment. Its low moisture absorption also helps maintain its mechanical properties in wet environments.

On the other hand, polypropylene also exhibits good moisture resistance but is slightly less hydrophobic than polyethylene. While it repels water effectively, it can absorb a minimal amount of moisture over time, especially in high-humidity conditions. This characteristic makes polypropylene suitable for applications like food containers, medical devices, and textiles, where moderate moisture resistance is sufficient.

In summary, polyethylene generally outperforms polypropylene in terms of moisture resistance due to its stronger hydrophobic nature. However, both polymers are highly effective in environments where moisture is a concern, with the choice depending on specific application requirements.