ASTM D6954-24 PDF

Full title and description

ASTM D6954-24 — Standard Guide for Exposing and Testing Plastics that Degrade in the Environment by a Combination of Oxidation and Biodegradation. This guide defines a tiered laboratory framework for accelerating and characterizing the combined oxidative and biodegradation behavior of polymeric materials intended to degrade in soil, landfill, composting, marine or other disposal/use environments. It provides a roadmap for sequentially applying established ASTM (and equivalent) test methods to evaluate: (1) abiotic oxidation (thermal and photooxidation) to generate residues, (2) biodegradation of oxidation residues under appropriate environmental conditions, and (3) assessment of ecological impact and residue acceptability.

Abstract

D6954-24 is a short, practical guide that assembles extant test methods into a three-tier approach for comparing and ranking the overall environmental degradation performance of plastics that require oxidation prior to biodegradation. Tier 1 accelerates oxidation (thermal/photo) and measures molecular weight and property loss; Tier 2 measures biodegradation (for example CO2 evolution tests) of oxidation residues under disposal-relevant conditions; Tier 3 assesses ecological impact, residues and acceptability. Results are intended for comparative and ranking purposes and cannot be directly extrapolated to field performance without confirmation.

General information

• Status: Active
• Publication date: January 3, 2024
• Publisher: ASTM International
• ICS / categories: 83.080.01 (Plastics in general)
• Edition / version: D6954-24 (2024 revision)
• Number of pages: 7

Scope

This guide provides a framework to compare and rank controlled laboratory rates of degradation and loss of physical properties of polymers that degrade by a combination of oxidation (thermal or photooxidation) followed by biodegradation. It identifies a three-tier testing strategy (Tier 1: accelerated oxidation and property/molecular-weight monitoring; Tier 2: biodegradation testing of oxidation residues under environment-appropriate biometric methods; Tier 3: evaluation of ecological impacts and residue acceptability). Intended disposal/use environments include soil, landfill, municipal or industrial compost and water; the guide is intended to support comparative ranking and design decisions for polymers that are expected to oxidize and biodegrade within approximately 24 months under the selected conditions.

Key topics and requirements

• Three-tier testing framework: Tier 1 (oxidation/photooxidation/abiotic), Tier 2 (biometric biodegradation tests), Tier 3 (ecotoxicity/residue assessment).
• Tier 1: selection of accelerated thermal and/or photooxidation conditions representative of the intended application/disposal environment and monitoring of molecular-weight and property loss.
• Tier 2: use of established biodegradation test methods (CO2-evolution or other biometric tests) appropriate to the chosen environment (compost, soil, marine, landfill) to measure rate and degree of biodegradation of oxidation residues.
• Tier 3: assessment of residues and potential ecological impacts (disintegration, chemical residues, effects on plant growth and soil/compost quality) to confirm residues are not persistent or harmful.
• Comparative/ranking intent: results are intended for relative comparison among materials and for guiding product design; laboratory results should not be directly extrapolated to absolute field lifetimes without confirmatory real-world exposure data.
• Material limits: primarily intended for polymers expected to oxidize and biodegrade within ~24 months in the intended environment; care to avoid testing at temperatures that cause phase changes (e.g., Tg) outside normal service/disposal ranges.
• Reference to complementary specifications and methods (for example, compostability and biodegradation test methods used in Tier 2) and need to follow appropriate test standards for the chosen disposal environment.

Typical use and users

This guide is used by polymer and additive developers, product design teams, testing laboratories, regulatory and compliance specialists, sustainability and environmental R&D groups, and consultants who need to compare or rank the environmental degradation potential of plastic formulations. Typical applications include agricultural mulch films, single-use articles, packaging or other plastic products where designers seek controlled degradation without adverse residues. Testing labs use the guide to assemble and interpret sequences of standardized tests; manufacturers use it to support development, claims and labeling strategies (in combination with condition-specific specifications where relevant).

Related standards

Commonly referenced and complementary standards include ASTM D5338 (aerobic biodegradation under controlled composting conditions / ISO 14855), ASTM D6400 (compostable plastics specification), ASTM D5988 (aerobic biodegradation in soil / ISO 17556), ASTM D6691 (marine biodegradation test methods), ISO 17088 and EN 13432 (compostability specifications), and various ecotoxicity and disintegration test methods (OECD/ISO). D6954 is intended to be applied together with the appropriate environment-specific test methods for Tier 2 and with residue/ecotoxicity assessments in Tier 3.

Keywords

ASTM D6954-24; oxidation; photooxidation; thermal oxidation; biodegradation; composting; soil biodegradation; CO2 evolution; tiered testing; compostable; disintegration; environmental degradation; plastics testing; ecotoxicity; polymer ranking.

FAQ

Q: What is this standard?

A: ASTM D6954-24 is a short guide that organizes existing test methods into a three-tiered approach to evaluate plastics that require abiotic oxidation followed by biodegradation. It helps users compare and rank materials’ laboratory degradation behavior across selected disposal or use environments.

Q: What does it cover?

A: It covers the framework and intent for sequential testing: Tier 1 (accelerated oxidation and measurement of property and molecular-weight loss), Tier 2 (biodegradation testing of oxidation residues using environment-appropriate biometric methods), and Tier 3 (assessment of ecological impacts and residue acceptability). The guide is intended for comparative laboratory assessments and references specific test methods for each tier.

Q: Who typically uses it?

A: Polymer/material developers, laboratory testing organizations, product designers, sustainability teams, environmental consultants, and regulatory/compliance personnel who need to assess or compare the degradability behavior of plastics that depend on oxidation prior to biodegradation.

Q: Is it current or superseded?

A: The D6954-24 edition is the 2024 revision and is the current active guide. It supersedes earlier published editions and consolidates the guide’s recommendations for applying existing test methods in a tiered sequence.

Q: Is it part of a series?

A: D6954 is part of ASTM’s plastics test-method portfolio developed under committee D20 (subcommittee D20.96). It is not a sequential numbered series itself but is routinely used alongside related ASTM and ISO standards (for example D5338, D5988, D6691, D6400) that address biodegradation or compostability in specific environments.

Q: What are the key keywords?

A: Key keywords include oxidation, photooxidation, biodegradation, composting, CO2 evolution, disintegration, environmental degradation, plastics testing, tiered testing, and ecological impact assessment.