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What are the effects of prolonged submersion on PVC’s structural integrity?
Prolonged submersion in water can significantly impact the structural integrity of PVC (polyvinyl chloride) materials. While PVC is known for its resistance to moisture and corrosion, extended exposure to water may lead to gradual degradation. Over time, water absorption can cause slight swelling, reducing the material's mechanical strength and flexibility. Additionally, prolonged submersion in certain environments (e.g., saltwater or chemically treated water) may accelerate plasticizer leaching, making the PVC more brittle.
Studies indicate that while PVC generally maintains its shape and function underwater, long-term exposure can weaken joints and seams, increasing the risk of cracks or failures under stress. Temperature fluctuations further exacerbate these effects, as repeated expansion and contraction strain the material.
To mitigate these risks, manufacturers often use additives or coatings to enhance water resistance. For critical applications, regular inspections and proper installation techniques are essential to ensure PVC’s longevity in submerged conditions. Understanding these effects helps in selecting the right PVC grade for aquatic or high-moisture environments.
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