The moisture and water resistance of extruded xps foam board (extruded polystyrene foam) is mainly due to its closed cell structure and the chemical properties of polystyrene. The following are the specific moisture and waterproof mechanisms:
1. Closed-cell structure: The manufacturing process of XPS extruded panels forms a tight closed-cell honeycomb structure. This structure allows the pores of the panels to be completely closed, thus preventing the penetration of water molecules and water vapour. The closed pore structure almost does not allow moisture to pass through, so the water absorption rate of the sheet is extremely low.
2. Low water absorption: The water absorption rate of extruded xps foam board is very low, usually below 0.1%. This means that in the case of prolonged exposure to moisture, the panels will hardly absorb water, thus maintaining their good thermal insulation properties.
3. Chemical stability: Polystyrene itself has excellent waterproof performance and does not easily absorb moisture or water. This makes the XPS extruded xps foam board will not expand, deform or degrade in performance when it meets water, keeping its physical properties and functions stable.
4. Anti-freezing and anti-icing: In low-temperature environments, extruded xps foam board have a very low water absorption rate, thus avoiding material expansion or structural damage caused by water icing. This characteristic effectively prevents material damage in extreme climatic conditions.
5. Durability: The closed cell structure and stable chemical properties of extruded xps foam board make them very resistant to aging. Even during long-term use, the panels are not susceptible to moisture erosion or aging, ensuring their long-lasting waterproof performance.
Overall, the moisture and waterproof performance of extruded panels mainly relies on its closed cell structure and the nature of polystyrene material, which enables it to maintain its excellent thermal insulation and waterproof effect in various wet or watery environments.
