ISO 20819-2:2023

ISO 20819-2:2023 - Overview

ISO 20819-2:2023 specifies standardized test methods for evaluating the fundamental physical properties and durability of wood‑plastic recycled composites (WPRC). It is the test‑method companion to ISO 20819‑1 (which covers specification, recycling ratio, labelling and safety). The standard targets products that contain at least 40% recycled plastic by mass and covers both non‑foaming (solid or hollow) and cellular (foamed) WPRC types.

Key technical topics and requirements

• Scope and definitions: Establishes terminology for WPRC, non‑foaming vs cellular materials and links to ISO 472 vocabulary.
• Quality and appearance: Rules for acceptable visual defects (dirt, warping, foreign matter, chipping/cracks) and partner consultation where applicable.
• Physical property test methods:
  • Density (multiple collection methods)
  • Water absorption and length change after immersion
  • Flexural properties (strength) per ISO‑type flexural tests
  • Impact resistance (cut‑out and actual‑size specimens)
  • Thermal properties (temperature of deflection under load; residual thermal flexural stress)
• Durability test methods:
  • Weathering tests (e.g., xenon‑arc exposure referenced via ISO 4892‑2)
  • Heat‑aging and thermal cycling procedures with post‑test flexural/impact evaluations
• Sampling and specimen preparation: Detailed collection methods, specimen dimensions and required sample counts for both basic and durability tests (different rules for surface‑collected vs product‑cut specimens).
• Reporting: Test report requirements and an informative Annex A providing guidance on performance standards.
• Normative references: Links to related ISO tests (ISO 75‑2, ISO 178, ISO 179‑1, ISO 4892‑2), ISO 16616 (NFC deck boards), and EN 15534 series.

Practical applications - who uses this standard

• Manufacturers of WPRC products (decking, louvers, interior panels, flooring) for product development and quality control.
• Independent testing laboratories for consistent, reproducible evaluation and certification.
• Specifiers, architects and procurement teams who require validated durability and performance data for recycled‑content materials.
• Regulators and conformity assessment bodies for market surveillance and compliance referencing ISO 20819‑1/‑2.
• Recycling and sustainability program managers seeking standard methods to substantiate claims about recycled‑content product performance.

Related standards

• ISO 20819‑1:2020 (Specification, labelling and safety)
• ISO 16616 (NFC/WPC test methods)
• ISO 75‑2, ISO 178, ISO 179‑1, ISO 4892‑2 (referenced test methods)

Keywords: ISO 20819-2, WPRC, wood-plastic recycled composites, test methods, durability testing, physical properties, recycled plastics, WPC standards.