# Pigment selection and solar heating of composites

Canonical: https://woodplasticcomposite.net/guides/pigment-selection-and-solar-heating-of-composites/
Language: en
Updated: 2026-10-15
Version: 1
Review: AI-assisted English editorial draft. Human technical review has not been recorded.

## Summary

Colour and surface temperature should be considered together, but visual colour alone does not provide a complete thermal specification. Pigment choices need evaluation in the finished WPC system.

## Technical context

Two surfaces that appear similar can respond differently to incident radiation. Geometry, exposure, wind and the supporting arrangement also affect measured temperatures. A marketing label such as cool colour needs a defined comparison and test condition.

https://woodplasticcomposite.net/guides/pigment-selection-and-solar-heating-of-composites/#technical-context

## What to measure and document

Prepare representative samples and record the exposure conditions, instrument and measurement location. Compare surfaces simultaneously where possible. Report the actual temperature observations and uncertainty rather than claiming a universal comfort advantage from one test.

https://woodplasticcomposite.net/guides/pigment-selection-and-solar-heating-of-composites/#verification-plan

## Implications for development and specification

For barefoot or seating applications, treat heat as a project-level usability issue. Shade and access arrangements may matter alongside material choice. Do not promise that a pigment makes a surface safe to touch under every summer condition.

https://woodplasticcomposite.net/guides/pigment-selection-and-solar-heating-of-composites/#practical-decision

## Related reading and evidence limits

Research on co-extruded coatings for composite durability. Use the linked work as related reading. The practical checks above are editorial recommendations, not reported test results or a substitute for product qualification.

https://woodplasticcomposite.net/guides/pigment-selection-and-solar-heating-of-composites/#reading-scope

## Key points

Two surfaces that appear similar can respond differently to incident radiation.
Prepare representative samples and record the exposure conditions, instrument and measurement location.
For barefoot or seating applications, treat heat as a project-level usability issue.

## Comparison

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

## What evidence is needed for pigment selection and solar heating of composites?

Prepare representative samples and record the exposure conditions, instrument and measurement location. Compare surfaces simultaneously where possible. Report the actual temperature observations and uncertainty rather than claiming a universal comfort advantage from one test.

## Sources

1. Co-extruded coatings for WPC durability — https://research.fs.usda.gov/treesearch/28811