Quality Assurance of Lead-Tungstate Crystals for the ePIC Electron Endcap Electromagnetic Calorimeter at the Electron–Ion Collider

The forthcoming Electron-Ion Collider (EIC) will collide high-energy polarized electrons with ions to map the quark-gluon structure of matter. ePIC, the detector being built for this facility at Brookhaven National Laboratory, relies on the Electron Endcap Electromagnetic Calorimeter (EEEMCal) to measure the energy of scattered electrons and photons with high precision. The EEEMCal is a homogeneous matrix of lead-tungstate (PbWO₄) crystals whose high density, short radiation length, and fast scintillation make them ideal for compact, fast-response calorimetry using silicon photomultipliers. In this poster, we present the crystal quality-assurance workflow, including visual inspection, dimensional checks, and optical transmission measurements implemented during the 2025 QA effort.