Product Category Rules
PCR are typically developed by stakeholder committees or groups abiding ASTM International standards development consensus methods. Among Rules informing preparation of Supplementary Cementitious Materials Environmental Product Declaration (EPD) is the NSF National Center for Sustainability Standards’ 2020 PCR for Slag Cement. It details product life cycle stages for the Slag Cement Association to consider in the Industry Wide EPD for Slag Cement.
PCR prescribe how certified individuals or entities prepare a life cycle assessment critical to documenting EPD metrics, led by carbon dioxide emissions. CO2 impacts are expressed in EPDs as Global Warming Potential, typically in kilograms per metric ton or other unit of measure associated with construction materials or products and their Process and Construction Stages.