A closed 20-mL glass scintillation vial containing approximately 5 grams of an aluminum hydride compound ruptured and shattered, likely due to pressure buildup after 6 weeks of storage. The glass vial with aluminum hydride compound was stored inside a closed plastic box. The plastic box with vial was stored within an air-free glove box at room temperature. When the glass vial ruptured, the vial was contained within the plastic box; however, the plastic box door was forced slightly ajar. The ruptured containers and internal materials were fully contained within the glove box. No damage was observed to the glove box and no one was injured. The attached photograph shows the remains of the vial within the plastic box.