School Trophy Case Spontaneous Glass Breakage Investigation Checklist
Spontaneous glass breakage in a school trophy case is the fracture of a glass panel in the absence of any observed direct impact — a panel that was intact at the end of one school day is found shattered at the start of the next, or breaks during a quiet hallway period when no collision was witnessed. A school trophy case spontaneous glass breakage investigation is the structured process of documenting the failure scene, reading the fracture pattern to identify the most probable cause category, preserving physical evidence for glazier or manufacturer review, and determining what corrective action is required before the case is returned to service. Three cause categories account for the overwhelming majority of spontaneous failures in school display cases: thermally induced contact stress from inadequate glass-to-metal clearance, edge damage introduced during original installation or subsequent hardware handling, and — in tempered glass panels — delayed fracture triggered by nickel sulfide (NiS) inclusions that expand microscopically over time until the glass’s internal tension is exceeded. This checklist guides facilities staff through each investigation phase in the order that preserves the most diagnostic information.
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