Why a decomposition timeline needs a defined material, test method, environment and endpoint—and why ISO 17556 is not a blanket cotton-garment test.
By PANCH Apparel | Circularity · Textile Science · Evidence
A statement such as 'biodegrades in 1–5 months' sounds precise. Without a test method and boundary, it is not scientifically precise. ISO 17556:2019 specifies a method for ultimate aerobic biodegradability of plastic materials in soil by measuring oxygen demand or carbon dioxide evolution; it is not a generic certification of cotton garments.
Evidence before adjectives.
THE TECHNICAL QUESTION
The specification must be defined before the claim is written. PANCH treats material composition, process conditions, test method and end-of-life pathway as separate variables that must be connected rather than collapsed into one sustainability statement.
WHERE THE SPECIFICATION MATTERS
Fibre, yarn, construction, chemistry and finishing interact. Changing one variable can alter durability, colourfastness, comfort, recoverability or biodegradation behaviour. The correct engineering question is always: what outcome is required, under what conditions, and how will it be verified?
THE PANCH EVIDENCE CHAIN
- Define the material and process.
- Connect the claim to the relevant batch.
- Use the appropriate laboratory, certification or operational evidence.
- State limitations and test conditions.
THE ANTI-GREENWASHING TEST
Do not turn a potential mechanism into a guaranteed outcome. A natural fibre is not automatically a biodegradable finished garment; an enzyme is not automatically lower impact; a ZLD facility is not automatically zero-impact. Claims must follow evidence.
THE PANCH STANDARD
Design the material system. Control the process. Test what matters. Tell the truth about the boundary.
PANCH® — Soil-to-Soil Luxury.