{"id":"wpc-tech-2026-article-wpc-uv-fading-surface-temperature-en","slug":"wpc-uv-fading-surface-temperature","locale":"en","url":"https://woodplasticcomposite.net/guides/wpc-uv-fading-surface-temperature/","aiAssisted":true,"answer":"Appearance, surface temperature and structural condition are related but distinct. Assess each with suitable evidence rather than treating one result as a complete weathering assessment.","author":"NFC & WPC Knowledge Reference","categoryId":"wpc-tech-2026-category-wpc-technical-design-series-en","change_note":"Original educational article informed by Klyosov (2007). Modern project applications are editorial synthesis. This is not a product certificate or a substitute for project-specific design.","description":"Separate colour change, thermal comfort and retained performance when choosing outdoor composites.","faqIds":["wpc-tech-2026-faq-technical-wpc-uv-fading-surface-temperature-en"],"heroImageId":"","modified":"2026-10-01","noindex":false,"published":"2026-10-01","referenceIds":["wpc-tech-2026-reference-technical-series-book-16-en","wpc-tech-2026-reference-technical-series-green-plank-en"],"related":["wpc-tech-2026-article-wpc-fire-performance-classification-cladding-en","wpc-tech-2026-article-wpc-formulation-recycled-materials-durability-en"],"review_status":"Technical and language review not yet recorded","reviewedAt":"","reviewer":"","sections":[{"heading":"The technical principle","id":"technical-principle","references":[1],"text":"Sunlight can change pigments, natural fibres and polymer surfaces. Colour shift does not by itself prove structural failure, and retained colour does not prove unchanged mechanical performance. Darker surfaces often absorb more solar energy, but actual temperatures also depend on exposure, airflow and surface properties.","url":"https://woodplasticcomposite.net/guides/wpc-uv-fading-surface-temperature/#technical-principle"},{"heading":"What to specify and verify","id":"specification","references":[1],"text":"Request the weathering protocol, exposure duration and measured colour change, together with relevant retained properties. Compare samples in consistent lighting. For barefoot-use areas, assess heat exposure and comfort separately from slip testing, and consider shading or other design responses.","url":"https://woodplasticcomposite.net/guides/wpc-uv-fading-surface-temperature/#specification"},{"heading":"Application and common mistakes","id":"application","references":[1],"text":"Do not use outdoor air temperature as a guaranteed maximum board temperature. Do not convert a stated number of laboratory exposure hours into years without a validated relationship. Set realistic appearance expectations before purchase and keep a sample for future comparison under comparable viewing conditions.","url":"https://woodplasticcomposite.net/guides/wpc-uv-fading-surface-temperature/#application"},{"heading":"Discuss your project with Green Plank","id":"green-plank-project","references":[2],"text":"For a Green Plank specification, request samples and current technical documents for the exact profile and intended application. Use the Green Plank link in Sources to explore the range and make an enquiry. Commercial disclosure: this portal features Green Plank. General material science does not certify any particular product.","url":"https://woodplasticcomposite.net/guides/wpc-uv-fading-surface-temperature/#green-plank-project"}],"seoDescription":"Separate colour change, thermal comfort and retained performance when choosing outdoor composites.","seoTitle":"WPC weathering: UV fading and hot surface temperatures","tableText":"Specification check | Evidence to request\nAppearance | Measured colour change and conditions\nComfort | Surface temperature in intended use\nIntegrity | Relevant retained material properties","table_caption":"Project specification checklist","tagIds":[],"takeaways":"Appearance: Measured colour change and conditions.\nComfort: Surface temperature in intended use.\nIntegrity: Relevant retained material properties.","title":"WPC weathering: UV fading and hot surface temperatures","topicIds":[],"translationGroup":"wpc-technical-guide-16-2026","version":1,"references":[{"accessed":"2026-10-01","description":"","noindex":false,"publisher":"John Wiley & Sons","seoDescription":"","seoTitle":"Klyosov, A. A. (2007). Wood–Plastic Composites. Chapters 15 and 16; pp. 550–556, 585–590.","title":"Klyosov, A. A. (2007). Wood–Plastic Composites. Chapters 15 and 16; pp. 550–556, 585–590.","type":"Book","url":"https://doi.org/10.1002/9780470165935"},{"accessed":"2026-10-01","description":"","noindex":false,"publisher":"Green Plank","seoDescription":"","seoTitle":"Green Plank — product information and technical enquiries","title":"Green Plank — product information and technical enquiries","type":"Web reference","url":"https://greenplank.eu/"}],"faqs":[{"question":"Does fading mean the decking has failed structurally?","answer":"Not necessarily. Assess appearance requirements and structural condition separately."}]}