Cap layer
An outer layer modifying surface behaviour. Coverage, thickness and adhesion matter; a cap does not make cut ends or joints automatically waterproof.
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KNOWLEDGE REFERENCE
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Explore the published reference collection.
Co-extrusion
Simultaneous formation of multiple material streams into a layered product. A cap can differ chemically from the composite core.
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Composite cladding
Profiles used as an exterior covering. Fire, wind, fixing and ventilation requirements belong to the complete façade system.
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Composite decking
Boards intended as an outdoor walking surface over supports. Verify span, slip behaviour, fastening and exposure for the exact product.
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Composite fencing
Composite elements used in fences or screens. Posts, foundations and connections must resist the site's wind loads.
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Coupling agent
An additive promoting interaction between dissimilar constituents. A compatibiliser has a related role, but the terms are not exact synonyms in every chemistry.
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Creep
Progressive deformation under sustained load. Temperature, stress and time affect it, so short bending tests cannot establish long-term deflection alone.
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Environmental product declaration (EPD)
A structured declaration of environmental data based on defined rules. An EPD is not by itself an environmental superiority label.
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Extrusion
Continuous shaping of a heated compound through a die. Cooling and calibration help establish the profile dimensions.
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High-density polyethylene (HDPE)
A polyethylene grade family used as a WPC matrix. Resin grade, melt flow and additives matter more than the acronym alone.
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Life cycle assessment (LCA)
Assessment of environmental impacts across a defined system. Comparisons require compatible functions, boundaries, assumptions and service-life scenarios.
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Natural fibre composite (NFC)
A composite containing natural fibres or particles in a matrix. NFC is broader than WPC: flax, hemp and agricultural fibres need not contain wood.
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Polypropylene (PP)
A thermoplastic matrix used in natural-fibre composites. Processing conditions and compatibility with fibres must suit the selected grade.
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Polyvinyl chloride (PVC)
A thermoplastic used in some composite profiles. WPC does not mean PVC-free; confirm the actual formulation rather than assuming resin identity.
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Recyclability
The ability to collect and process material into a useful output. Actual acceptance, sorting and local facilities must also exist.
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Traceability
Connecting delivered products to manufacturing, raw-material and quality records. A supplier name alone is not complete batch evidence.
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Water absorption
Water taken up under specified exposure conditions. Duration, temperature and specimen geometry must accompany a reported percentage.
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Weathering
Changes caused by sunlight, moisture and temperature exposure. Colour retention and retained mechanical performance are different outcomes.
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Wood flour
Finely ground wood particles. Particle-size distribution, species and moisture matter; wood flour is not identical to long reinforcing fibres.
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Wood–plastic composite (WPC)
A material combining wood particles or fibres with a polymer. The formulation and finished profile determine performance; WPC is not a quality grade.
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