{"id":"wpc-tech100-article-001-en","slug":"dry-basis-calculations-for-wpc-formulation","locale":"en","url":"https://woodplasticcomposite.net/guides/dry-basis-calculations-for-wpc-formulation/","title":"Dry-basis calculations for WPC formulation","answer":"A WPC recipe needs a declared moisture basis before ingredient percentages can be compared. Water arriving with wood flour is not dry reinforcement and should not quietly replace polymer in the calculation.","author":"NFC & WPC Knowledge Reference","faqIds":["wpc-tech100-faq-001-en"],"tagIds":[],"noindex":false,"related":["wpc-tech100-article-002-en"],"version":1,"modified":"2026-10-15","reviewer":"","sections":[{"id":"technical-context","text":"Consider an illustrative delivery containing 100 kg of wood flour at 8% moisture on a wet basis. It contains 92 kg dry wood and 8 kg water. That is a bookkeeping example, not a recommended extrusion moisture target. Dry-basis moisture would use a different denominator.","heading":"Technical context","references":[],"url":"https://woodplasticcomposite.net/guides/dry-basis-calculations-for-wpc-formulation/#technical-context"},{"id":"verification-plan","text":"Ask the laboratory to state the moisture method and denominator. Record delivered mass, dry solids and any losses separately. Reconcile a trial batch against the final dry composition before comparing its mechanical results with another recipe.","heading":"What to measure and document","references":[],"url":"https://woodplasticcomposite.net/guides/dry-basis-calculations-for-wpc-formulation/#verification-plan"},{"id":"practical-decision","text":"A purchasing specification should identify whether fibre content is as received or dry mass. Keep acceptance limits separate from calculation examples. This makes supplier comparisons clearer without demanding disclosure of every proprietary additive.","heading":"Implications for development and specification","references":[],"url":"https://woodplasticcomposite.net/guides/dry-basis-calculations-for-wpc-formulation/#practical-decision"},{"id":"reading-scope","text":"An engineering-statistics introduction to systematic experimental design. 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/dry-basis-calculations-for-wpc-formulation/#reading-scope"}],"seoTitle":"Dry-basis calculations for WPC formulation | 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":"Consider an illustrative delivery containing 100 kg of wood flour at 8% moisture on a wet basis.\nAsk the laboratory to state the moisture method and denominator.\nA purchasing specification should identify whether fibre content is as received or dry mass.","aiAssisted":true,"categoryId":"wpc-tech100-category-0","reviewedAt":"","change_note":"New focused technical draft; not a product certification or production recipe.","description":"A WPC recipe needs a declared moisture basis before ingredient percentages can be compared.","heroImageId":"","referenceIds":["wpc-tech100-ref-doe"],"review_status":"AI-assisted English editorial draft. Human technical review has not been recorded.","table_caption":"Evidence checklist for dry-basis calculations for wpc formulation","seoDescription":"A WPC recipe needs a declared moisture basis before ingredient percentages can be compared.","translationGroup":"wpc-tech100-001-2026","references":[{"url":"https://www.itl.nist.gov/div898/handbook/pmd/section3/pmd31.htm","type":"web","title":"NIST: design of experiments","noindex":false,"accessed":"2026-10-14","seoTitle":"NIST: design of experiments","publisher":"NIST","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 dry-basis calculations for WPC formulation?","answer":"Ask the laboratory to state the moisture method and denominator. Record delivered mass, dry solids and any losses separately. Reconcile a trial batch against the final dry composition before comparing its mechanical results with another recipe."}]}