How is the mass balance approach perceived by other organizations?

Mass balance systems are endorsed by a wide breadth of organizations ranging from global NGO’s like WWF to  industry trade organizations like the American Chemistry Council.

In 2016, the ISEAL Alliance issued a reference document on chain of custody models to help sustainability standards align on common terms and definitions  including mass balance. ISO 22095 “Chain of custody – General terminology and models” was issued in 2020 and also serves as a reference for standard setting organizations. 

However, while the approach is common – there are differences in implementation within individual standards.