# Wood flour, sawdust, fibre and CTMP: choosing a consistent feedstock

Canonical: https://woodplasticcomposite.net/guides/wood-flour-sawdust-ctmp-wpc-feedstock/
Language: en
Updated: 2026-10-16
Version: 1
Review: AI-assisted English article. Human technical review has not been recorded.

## Summary

Wood feedstock is an engineered input, not an interchangeable bag of waste. Species, particle preparation and handling all belong in the material specification.

## Distinguish the forms

Wood flour usually describes finely divided particles. Sawdust is a machining by-product whose geometry depends on the operation that produced it. Wood fibre can have a more elongated form. CTMP means chemithermomechanical pulp, identifying a fibre-production route rather than a finished WPC grade. A supplier's terminology should be supported by measurable incoming properties. 

Pine, maple and oak should not be treated as a ranking from inferior to superior. Research on different wood feedstocks shows that a range of species can be used; the interaction with matrix and formulation matters.

https://woodplasticcomposite.net/guides/wood-flour-sawdust-ctmp-wpc-feedstock/#distinguish-the-forms

## Define an incoming inspection plan

For editorially recommended purchasing control, record species or controlled species mix, source process, moisture, particle distribution, bulk handling behaviour and unwanted material. Separate clean production residues from painted, treated or demolition-derived material. Do not let a generic recycled-content statement conceal this distinction.

Pelletized wood feedstock can change storage and transport arrangements. An LCA comparing wood flour and pellets illustrates why preparation and logistics should be evaluated alongside the composite's properties.

https://woodplasticcomposite.net/guides/wood-flour-sawdust-ctmp-wpc-feedstock/#define-an-incoming-inspection-plan

## Establish change control

If a supplier switches from one wood stream to another, require a documented review rather than assuming that a similar colour establishes equivalence. Retain an approved sample and link feedstock batches to finished-board batches.

For European buyers, nearby supply can make documentation and communication more convenient. Its technical value comes from the actual quality system: known origins, repeatable specifications and evidence that changes are assessed before products reach a construction site.

https://woodplasticcomposite.net/guides/wood-flour-sawdust-ctmp-wpc-feedstock/#establish-change-control

## Evidence and source scope

[1] Research chapter; feedstock terminology.

[2] Official project findings summary.

[3] Research study; official abstract consulted.

https://woodplasticcomposite.net/guides/wood-flour-sawdust-ctmp-wpc-feedstock/#evidence-scope

## Key points



## Comparison





## Sources

1. Wood flour; USDA Forest Products Laboratory — https://research.fs.usda.gov/treesearch/23122
2. USFS Wood Innovations project: eastern hardwood feedstocks in WPC — https://apps.fs.usda.gov/nicportal/WOODINNOVATIONS/dspProjectDetailReport.cfm?id=86
3. Life Cycle Assessment of Wood Flour and Pellets for Manufacturing Wood-Plastic Composites — https://research.fs.usda.gov/treesearch/63855