At a glance
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.
Key points
- Consider an illustrative delivery containing 100 kg of wood flour at 8% moisture on a wet basis.
- Ask the laboratory to state the moisture method and denominator.
- A purchasing specification should identify whether fibre content is as received or dry mass.
Technical context #
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.
What to measure and document #
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.
Implications for development and specification #
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.
Related reading and evidence limits #
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.
Evidence checklist for dry-basis calculations for wpc formulation
| Review step | Evidence to retain |
|---|---|
| Material and geometry | Exact specimen or product identity |
| Verification | Method, conditions and individual observations |
| Decision | Approved scope and documented limitations |
Common questions
What evidence is needed for dry-basis calculations for WPC formulation?
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.
Question permalink ↗Sources & further reading
- NIST: design of experiments ↗NIST · web · 2026-10-14
Cite this page
J. A. Gill. “Dry-basis calculations for WPC formulation” Version 1. Updated 2026-10-15. https://woodplasticcomposite.net/guides/dry-basis-calculations-for-wpc-formulation/
Author profile
Author: J. A. Gill
WPC and natural-fibre composite specialist · Innovator, inventor, product designer and entrepreneur
New focused technical draft; not a product certification or production recipe.
General material information is not product certification or project-specific engineering advice.
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