The service is offered with particular reference to products made of metals, their alloys and their derivatives. The certification of the recycled and/or recovered and/or by-product content in the finished product is based on the provisions of UNI/PdR 88:2020 through a mass balance according to the criteria defined by ISO 14021 and on the concepts and definitions of the materials involved in this calculation based on what is defined by Italian legislation regarding waste management. This certification can be used to ensure compliance with CAM (Minimum Environmental Criteria) requirements.