ZDHC MRSL and Chemical Management in the Supply Chain
The ZDHC Manufacturing Restricted Substances List sets limits for chemicals used in production, not only for residues on the product.
This article sets out what the requirement involves, how to specify it and how to verify it before bulk production.
What the MRSL regulates
It restricts chemical formulations used by mills, covering substances that are hazardous to workers and the environment.
It also reduces the risk of a mid-season change, which is where both cost and calendar damage usually originate.
Difference from product limits
Product standards regulate what remains on the garment, while the MRSL regulates what is brought into the factory.
Document what happens when the result falls outside the range, including sorting, reworking and claim handling.
- Confirm the numeric range and the test method in the specification
- Keep an approved physical standard at the machine
- Retest after the agreed care regime before shipping
Implementation route
Chemical inventory review, supplier declarations and progressive substitution of non-compliant formulations.
Keep a physical standard at the machine so operators compare against the approved sample rather than memory.
Verification tools
Gateway reporting and third-party audits demonstrate progress to buyers and regulators.
Keep reports on file with the sample identification, so results can be traced back to a specific roll or batch.
- Request test reports on production fabric, not on development samples
- Verify the sampling plan and the number of specimens
- Store reports with roll or lot identification for traceability
Buyer expectations
Increasingly, MRSL conformity is a condition of onboarding rather than an improvement target.
Expect the cost and lead time implications to appear in sampling and capacity booking rather than in the yarn price alone.
Summary
Used as a checklist in development and again before shipment, the points above prevent the most common and most expensive failures.
