OEKO-TEX® acknowledges the value of confidential chemical recipes, including bills of substances (BoS). However, OEKO-TEX® mandates the publication of all constituent substances, known contaminants, or by-products regulated by OEKO-TEX® or classified as hazardous per GHS or REACH (article 57) regulation. Declaring all constituent substances and contaminants reduces testing effort and certification process costs. The information provided by chemical producers is encrypted and stored securely by the certifying institute and OEKO-TEX®.

OEKO-TEX® and ZDHC collaborate closely to harmonize requirements. ECO PASSPORT certificates adhere to the latest ZDHC MRSL and Conformance Guidance. Furthermore, ECO PASSPORT certificates marked as ZDHC MRSL 3.0 compliant also comply with ZDHC MRSL 3.1. OEKO-TEX® fully supports the ZDHC initiative, ensuring compliance through various services. The STeP MRSL encompasses all chemicals banned by the latest ZDHC MRSL, and the OEKO-TEX® STeP chemical list covers all substances required by the ZDHC wastewater guideline. OEKO-TEX® recognizes the ZDHC list of provisionally accepted laboratories for wastewater testing as a reference (visit ZDHC website). Additionally, OEKO-TEX® Detox to Zero (DTZ) MRSL covers all chemicals prohibited by the latest ZDHC MRSL, along with substances and parameters mandated by the ZDHC wastewater guideline.