{"id":"wpc-tech100-article-081-en","slug":"specimen-direction-and-location-in-wpc-test-programmes","locale":"en","url":"https://woodplasticcomposite.net/guides/specimen-direction-and-location-in-wpc-test-programmes/","title":"Specimen direction and location in WPC test programmes","answer":"A test programme should identify where each specimen came from and how it was oriented. Without that map, differences between results may be wrongly attributed to formulation alone.","author":"NFC & WPC Knowledge Reference","faqIds":["wpc-tech100-faq-081-en"],"tagIds":[],"noindex":false,"related":["wpc-tech100-article-082-en"],"version":1,"modified":"2026-10-15","reviewer":"","sections":[{"id":"technical-context","text":"An extruded, moulded or printed material can contain a directional structure. Cutting samples from different regions may also change the proportion of surface and interior material. A standard specimen shape does not erase those manufacturing differences.","heading":"Technical context","references":[],"url":"https://woodplasticcomposite.net/guides/specimen-direction-and-location-in-wpc-test-programmes/#technical-context"},{"id":"verification-plan","text":"Create a sampling drawing before machining. Mark the production direction and retain the parent component identity. Use consistent preparation and report any excluded or damaged specimens with a reason rather than removing them silently.","heading":"What to measure and document","references":[],"url":"https://woodplasticcomposite.net/guides/specimen-direction-and-location-in-wpc-test-programmes/#verification-plan"},{"id":"practical-decision","text":"Match sampling to the decision being made. Incoming quality monitoring, research comparison and component qualification may require different plans. A useful report allows another reader to understand exactly which material volume and direction the results represent.","heading":"Implications for development and specification","references":[],"url":"https://woodplasticcomposite.net/guides/specimen-direction-and-location-in-wpc-test-programmes/#practical-decision"},{"id":"reading-scope","text":"A finite-element modelling study compared predictions with tests on several WPC products. Use the linked work as related reading. The practical checks above are editorial recommendations, not reported test results or a substitute for product qualification.","heading":"Related reading and evidence limits","references":[1],"url":"https://woodplasticcomposite.net/guides/specimen-direction-and-location-in-wpc-test-programmes/#reading-scope"}],"seoTitle":"Specimen direction and location in WPC test programmes | 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":"An extruded, moulded or printed material can contain a directional structure.\nCreate a sampling drawing before machining.\nMatch sampling to the decision being made.","aiAssisted":true,"categoryId":"wpc-tech100-category-4","reviewedAt":"","change_note":"New focused technical draft; not a product certification or production recipe.","description":"A test programme should identify where each specimen came from and how it was oriented.","heroImageId":"","referenceIds":["wpc-tech100-ref-fem"],"review_status":"AI-assisted English editorial draft. Human technical review has not been recorded.","table_caption":"Evidence checklist for specimen direction and location in wpc test programmes","seoDescription":"A test programme should identify where each specimen came from and how it was oriented.","translationGroup":"wpc-tech100-081-2026","references":[{"url":"https://research.fs.usda.gov/treesearch/53195","type":"web","title":"WPC flexure prediction from axial and shear data","noindex":false,"accessed":"2026-10-14","seoTitle":"WPC flexure prediction from axial and shear data","publisher":"USDA Forest Service","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 specimen direction and location in WPC test programmes?","answer":"Create a sampling drawing before machining. Mark the production direction and retain the parent component identity. Use consistent preparation and report any excluded or damaged specimens with a reason rather than removing them silently."}]}