[en] We have studied the energy resolution, hadron rejection and ability to distinguish overlapped events for a highly segmented electromagnetic calorimeter using unpolished extruded lead glass bars. Energy resolution is in agreement with previous measurements of more conventional calorimeters. Hadron rejections of 10^-3 are achieved, without the use of particle momentum information. Overlapped events of π^+--γ are shown to be rejected at the level of 10^-2. A powerful method for predicting shower leakage energy is also presented