Overview
EN ISO 20200:2023 (ISO 20200:2023) - "Plastics - Determination of the degree of disintegration of plastic materials under composting conditions in a laboratory-scale test" - specifies a laboratory-scale method to quantify the degree of disintegration of plastic materials when exposed to simulated composting. The standard is limited to physical disintegration assessment and is not a test of biodegradability or a standalone basis for claiming compostability; further biodegradation testing and/or standards (e.g., ISO 17088) are required for compostability claims.
Key topics and requirements
- Scope and purpose: Measures physical breakdown of plastic materials in a controlled laboratory composting environment; scaled for general-purpose labs.
- Test principle: Small-scale composting reactors containing a synthetic solid waste matrix and test samples are incubated under defined conditions; remaining fragments are recovered and quantified to calculate degree of disintegration.
- Incubation modes:
- Type 1 - constant thermophilic incubation (thermophilic range specified).
- Type 2 - new two-stage incubation mode introduced in the 2023 edition.
- Optional mesophilic incubation (15 °C–45 °C) is defined for certain routes.
- Sample and reactor requirements: Uses small bioreactors (approx. 3 L of synthetic waste) and defined sample preparation procedures; sample dimension requirements updated in the 2023 revision.
- Monitoring and diagnostics: Includes odour, visual appearance, chemical analyses, dry mass and volatile solids determinations to track composting performance and test validity.
- Test termination and calculation: Procedures for recovering residual material, calculating degree of disintegration, expressing results, and reporting test validity.
Applications and who uses it
- Laboratories performing compostability-related testing and product characterization.
- Plastics manufacturers and R&D teams developing compostable or biodegradable polymers and formulations - to evaluate physical disintegration under composting conditions.
- Certification bodies and conformity assessors as part of a broader test battery (note: EN ISO 20200 alone does not certify compostability).
- Waste management researchers and regulators assessing end-of-life behavior of plastic products.
- Quality control for product consistency and formulation changes affecting disintegration.
Related standards
- ISO 17088 - specification for compostable plastics (compostability requirements and claims).
- ISO 14855-2 - referenced for terminology on compost and biodegradation context.
- ISO 3310-1, ISO 18606 - normative/cited references used in test procedures.
EN ISO 20200:2023 is essential for anyone evaluating how plastics physically break down in controlled composting environments and for integrating disintegration data into broader compostability and environmental assessments.