Previously, ADCA (azodicarbonamide) was added to the ZDHC MRSL V2.0 Candidate List but has now been moved to the ZDHC MRSL in V4.0. This means that the intentional use of ADCA in a chemical formulation or use of ADCA on-site by a supplier will be deemed as a non-conformance to the ZDHC MRSL V4.0. However, ZDHC acknowledges that despite the advancement in alternative approaches, there are some footwear processes and products where the use of ADCA is prevalent and the industry requires time to phase out ADCA. In such cases, the ZDHC guidance ensures that exposure to workers is minimised and emissions are controlled with proper measures.

If ADCA is used on-site, a facility should ensure proper exposure and emission controls. However, if a facility purchases a pre-formed EVA sheet to be used in footwear components, then this EVA and EVA components are out of the scope of the ZDHC MRSL but will need to meet brand RSL requirements. Only EVA manufactured on-site by a footwear facility is in the scope of the ZHDC MRSL and must meet the MRSL requirements.