Residual Microfragments from “Compostable” Packaging

Hidden Assumption

Packaging labeled compostable fully disappears in home compost within a reasonable consumer timeframe.

Experimental Conditions

• Home compost bin (ambient conditions)
• 12-week composting period
• Typical moisture and turning frequency

Fragment Detection

Compost is dried, sieved (5 mm then 1 mm), and inspected under stereomicroscopy. Any fragment ≥1 mm is counted.

Binary Compostability Test

Presence of any ≥1 mm packaging fragment after 12 weeks constitutes failure.

Why This Matters

Directly tests consumer-facing compostability claims under real home conditions without policy or environmental extrapolation.