How does moisture absorption affect the dimensional stability of polyethylene outdoor sculptures?

Polyethylene is a popular material for outdoor sculptures due to its durability and resistance to weathering. However, moisture absorption can significantly impact its dimensional stability. When polyethylene absorbs water, it undergoes slight swelling, which may lead to warping or distortion over time. This effect is more pronounced in high-humidity environments or areas with frequent rainfall.

The degree of moisture absorption depends on the density of the polyethylene used. Low-density polyethylene (LDPE) tends to absorb more moisture than high-density polyethylene (HDPE), making HDPE a better choice for sculptures requiring long-term stability. Additionally, additives like UV stabilizers and moisture barriers can mitigate these effects.

To maintain dimensional stability, artists and manufacturers should consider proper sealing or coating techniques to reduce moisture penetration. Regular maintenance, such as cleaning and inspecting for cracks, also helps preserve the sculpture's integrity. Understanding these factors ensures polyethylene sculptures remain visually appealing and structurally sound for years.