| Abstract Scope |
Vat Photopolymerization (VPP) manufacturing of ceramic parts relies on the
polymer suspension of ceramic particles in a loaded slurry. As they age, ceramic slurries are susceptible to particle agglomeration, sedimentation, and oxidative photopolymer degradation. To characterize the degradation and evaluate the usability of expired slurries, this study investigates the usability of expired LithaLox HP500 alumina slurry with expiration dates from 2019, 2023, and 2025. Slurries were homogenized via roller milling, and analyzed via pycnometry, rheology, and a cure depth analysis to measure the viscosity and printability of expired slurries against a 2026 control batch to establish a performance baseline. The study aims to assess, based on the measured properties, whether expired slurries are still viable |