How do manufacturers prevent WPC discoloration from tannin leaching in outdoor sofas?

Wood Plastic Composite (WPC) is a popular material for outdoor furniture due to its durability and low maintenance. However, tannin leaching from natural wood fibers can cause unsightly discoloration over time. Manufacturers employ several strategies to prevent this issue.

1. Pre-Treatment of Wood Fibers – Before blending with plastic, wood fibers are chemically treated to remove or neutralize tannins, reducing the risk of leaching.

2. High-Quality Polymer Coating – A UV-resistant and waterproof polymer layer is applied to the WPC surface, acting as a barrier against moisture and tannin migration.

3. Additives and Stabilizers – Special additives are mixed into the composite to inhibit tannin oxidation and discoloration when exposed to sunlight and rain.

4. Sealed Edges and Surfaces – Proper sealing of cut edges and surfaces prevents water infiltration, minimizing tannin release.

5. Regular Maintenance Recommendations – Manufacturers often advise periodic cleaning and resealing to maintain WPC’s appearance and longevity.

By implementing these methods, WPC outdoor sofas remain aesthetically pleasing and resistant to tannin-related discoloration, ensuring long-term durability in harsh weather conditions.