At a glance
A masterbatch dosage is not the same as the active ingredient dosage. Confusing the two can change colour, stabilisation and the polymer balance of a wood-plastic composite.
Key points
- An illustrative 2% addition of a masterbatch containing 30% pigment contributes 0.6% pigment and 1.4% carrier to the final mixture, when all values share the same mass basis.
- Record the active concentration, carrier identity and recommended processing range.
- Approve the substitution through a documented trial.
Technical context #
An illustrative 2% addition of a masterbatch containing 30% pigment contributes 0.6% pigment and 1.4% carrier to the final mixture, when all values share the same mass basis. The carrier is part of the formulation rather than an invisible ingredient.
What to measure and document #
Record the active concentration, carrier identity and recommended processing range. When replacing a masterbatch, compare the actual active input and carrier contribution rather than matching the old dosing percentage automatically.
Implications for development and specification #
Approve the substitution through a documented trial. Inspect colour, surface quality and relevant mechanical properties after processing. A numerically equivalent pigment dose does not establish compatibility between a new carrier and the original WPC matrix.
Related reading and evidence limits #
Official guidance on controlling measurement processes and supporting uncertainty statements. 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 masterbatch dilution in composite recipes
| 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 masterbatch dilution in composite recipes?
Record the active concentration, carrier identity and recommended processing range. When replacing a masterbatch, compare the actual active input and carrier contribution rather than matching the old dosing percentage automatically.
Question permalink ↗Sources & further reading
- NIST: statistical control of measurement processes ↗NIST · web · 2026-10-14
Cite this page
J. A. Gill. “Masterbatch dilution in composite recipes” Version 1. Updated 2026-10-15. https://woodplasticcomposite.net/guides/masterbatch-dilution-in-composite-recipes/
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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