02/19/2026
The more you understand biodegradable foam marketing claims and the ASTM standards frequently cited in them, the better you can spot what's legitimate versus potentially misleading or greenwashed.
Regulators such as the FTC have determined that results from ASTM D5511 alone cannot support unqualified claims that a product is "biodegradable." This is because the test does not demonstrate complete decomposition under typical real-world landfill conditions or common disposal scenarios. Moreover, biodegradation in such environments often plateaus well short of full mineralization.
To clarify the context, most U.S. landfills (approximately 95-99%) operate as "dry tomb" landfills. These facilities are designed to minimize moisture infiltration, using liners, covers, and leachate management systems, to isolate waste and reduce environmental risks like groundwater contamination. As a result, they create dry, anaerobic conditions where biological degradation of materials (including plastics) occurs very slowly, if at all, over decades or more.
In contrast, "bioreactive" (or "wet" / bioreactor) landfills represent only a small fraction (1-5%) of landfills. These actively manage moisture (often through leachate recirculation) to accelerate microbial activity, promoting faster waste stabilization and gas production. ASTM D5511 is an accelerated high-solids anaerobic test that better simulates the biologically active, higher-moisture conditions found in these rare bioreactive landfills—not the predominant dry tomb environments where most waste ends up.
For accurate and substantiated "biodegradable" claims in typical disposal scenarios, testing must better replicate actual landfill conditions (e.g., using methods like ASTM D5526 for varying moisture levels), and claims should be qualified accordingly to avoid misleading consumers.
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