# WPC formulation and durability: what specifiers should ask

Canonical: https://woodplasticcomposite.net/guides/wpc-formulation-recycled-materials-durability/
Language: en
Updated: 2026-10-01
Version: 1
Review: Technical and language review not yet recorded

## Summary

A formulation is a coordinated system. Fibre percentage, recycled content or a named additive alone cannot demonstrate outdoor durability.

## The technical principle

Natural fibres, polymers, coupling agents, fillers and stabilisers have different roles. Their interaction and processing history influence bonding, moisture behaviour and ageing. Recycled materials can be suitable with controlled inputs and validation; virgin resin still needs an appropriate outdoor formulation. Manufacturing consistency matters alongside ingredient selection.

https://woodplasticcomposite.net/guides/wpc-formulation-recycled-materials-durability/#technical-principle

## What to specify and verify

Ask how feedstock, moisture, batch identity and formulation changes are controlled. Require evidence that the delivered profile matches the tested product. A change in fibre source, polymer or stabilisation may require reassessment. Proprietary percentages are less useful than a traceable, consistent product with relevant results.

https://woodplasticcomposite.net/guides/wpc-formulation-recycled-materials-durability/#specification

## Application and common mistakes

Avoid asserting that one feedstock is always more durable or that recycling can continue indefinitely without property changes. When evaluating Green Plank, confirm the actual proposed formulation and supporting documents. Do not transfer claims from an older product, project or material recipe to a different current profile.

https://woodplasticcomposite.net/guides/wpc-formulation-recycled-materials-durability/#application

## Discuss your project with Green Plank

For a Green Plank specification, request samples and current technical documents for the exact profile and intended application. Use the Green Plank link in Sources to explore the range and make an enquiry. Commercial disclosure: this portal features Green Plank. General material science does not certify any particular product.

https://woodplasticcomposite.net/guides/wpc-formulation-recycled-materials-durability/#green-plank-project

## Key points

Inputs: Traceable and controlled raw materials.
Consistency: Batch and formulation-change control.
Durability: Relevant ageing and retained performance.

## Comparison

Specification check | Evidence to request
Inputs | Traceable and controlled raw materials
Consistency | Batch and formulation-change control
Durability | Relevant ageing and retained performance

## Does a high recycled percentage prove long service life?

No. Recycled content and durability are distinct claims requiring different evidence.

## Sources

1. Klyosov, A. A. (2007). Wood–Plastic Composites. Chapters 2, 3, 5 and 15; pp. 50–64, 92–115, 161–199, 493–550. — https://doi.org/10.1002/9780470165935
2. Green Plank — product information and technical enquiries — https://greenplank.eu/