Machine-Readable Material Passports for Photopolymer Products: Composition Boundaries, Process History and End of Life

Digital product and material passports are moving from conceptual circular-economy tools toward operational lifecycle information systems. For photopolymer products, a useful passport must represent more than product identity: it must preserve formulation boundaries, print and post-cure history, service-relevant state changes, repair or recoating events, and end-of-life constraints. This review proposes a machine-readable passport architecture that separates public, controlled and confidential information while retaining provenance. It emphasises state transitions and uncertainty, because a printed photopolymer component can no longer be described adequately by the identity of the original liquid resin alone. ER-393.