{"id":"wpc-tech100-article-050-en","slug":"skin-core-structure-in-moulded-composite-foams","locale":"en","url":"https://woodplasticcomposite.net/guides/skin-core-structure-in-moulded-composite-foams/","title":"Skin-core structure in moulded composite foams","answer":"A foamed composite can have a different structure near its surface than in its centre. Testing and design should recognise that through-thickness variation instead of treating every region as identical.","author":"NFC & WPC Knowledge Reference","faqIds":["wpc-tech100-faq-050-en"],"tagIds":[],"noindex":false,"related":["wpc-tech100-article-041-en"],"version":1,"modified":"2026-10-15","reviewer":"","sections":[{"id":"technical-context","text":"The skin may contribute differently from the cellular core under a particular load. Machining a specimen can remove part of that structure. Results from a cut sample may therefore answer a different question from a test of the intact component.","heading":"Technical context","references":[],"url":"https://woodplasticcomposite.net/guides/skin-core-structure-in-moulded-composite-foams/#technical-context"},{"id":"verification-plan","text":"Document where specimens came from and whether surfaces were retained. Combine section inspection with the mechanical test appropriate to the intended use. Record density and local geometry rather than relying on a single overall component weight.","heading":"What to measure and document","references":[],"url":"https://woodplasticcomposite.net/guides/skin-core-structure-in-moulded-composite-foams/#verification-plan"},{"id":"practical-decision","text":"Do not compare a machined coupon directly with an intact profile without explaining the difference. A useful test programme links the measured structure to the service function. Component qualification should use representative production, not only ideal laboratory mouldings.","heading":"Implications for development and specification","references":[],"url":"https://woodplasticcomposite.net/guides/skin-core-structure-in-moulded-composite-foams/#practical-decision"},{"id":"reading-scope","text":"Research on the influence of polymer blends in foamed composites. Use the linked work as related reading. The practical checks above are editorial recommendations, not reported test results or a substitute for product qualification. Commercial signpost: contact Green Plank at greenplank.eu for documentation on a specific product. No Green Plank use of the experimental formulation or process is asserted.","heading":"Related reading and evidence limits","references":[1,2],"url":"https://woodplasticcomposite.net/guides/skin-core-structure-in-moulded-composite-foams/#reading-scope"}],"seoTitle":"Skin-core structure in moulded composite foams | WPC Reference","topicIds":[],"published":"2026-10-15","tableText":"Review step | Evidence to retain\nMaterial and geometry | Exact specimen or product identity\nVerification | Method, conditions and individual observations\nDecision | Approved scope and documented limitations","takeaways":"The skin may contribute differently from the cellular core under a particular load.\nDocument where specimens came from and whether surfaces were retained.\nDo not compare a machined coupon directly with an intact profile without explaining the difference.","aiAssisted":true,"categoryId":"wpc-tech100-category-2","reviewedAt":"","change_note":"New focused technical draft; not a product certification or production recipe.","description":"A foamed composite can have a different structure near its surface than in its centre.","heroImageId":"","referenceIds":["wpc-tech100-ref-foamblend","wpc-tech100-ref-greenplank"],"review_status":"AI-assisted English editorial draft. Human technical review has not been recorded.","table_caption":"Evidence checklist for skin-core structure in moulded composite foams","seoDescription":"A foamed composite can have a different structure near its surface than in its centre.","translationGroup":"wpc-tech100-050-2026","references":[{"url":"https://doi.org/10.3390/ma12121971","type":"web","title":"Polymer blends in foamed wood-polymer composites","noindex":false,"accessed":"2026-10-14","seoTitle":"Polymer blends in foamed wood-polymer composites","publisher":"Materials","description":"Related reading; scope and limitations are identified in each article.","seoDescription":"Related reading; scope and limitations are identified in each article."},{"url":"https://greenplank.eu/","type":"web","title":"Green Plank: commercial product enquiry","noindex":false,"accessed":"2026-10-14","seoTitle":"Green Plank: commercial product enquiry","publisher":"Green Plank","description":"Related reading; scope and limitations are identified in each article.","seoDescription":"Related reading; scope and limitations are identified in each article."}],"faqs":[{"question":"What evidence is needed for skin-core structure in moulded composite foams?","answer":"Document where specimens came from and whether surfaces were retained. Combine section inspection with the mechanical test appropriate to the intended use. Record density and local geometry rather than relying on a single overall component weight."}]}