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Spontaneous glass breakage is a phenomenon by which toughened glass (or tempered) may spontaneously break without any apparent reason. The most common causes are: : * Minor damage during installation such as nicked or chipped edges later developing into larger breaks normally radiating from point of defect. : * Binding of the glass in the frame, causing stresses to develop as the glass expands and contracts due to thermal changes or deflects due to wind : * Internal defects within the glass such as nickel sulfide inclusions : * Thermal stresses in the glass : * Inadequate glass thickness to resist wind load == Installation damage == While glass is being moved and installed, it is easy for the glaziers to nick or chip the edges of the glass with various tools. It is also possible for fasteners such as nails or screws used to attach glass stops to nick the glass edges if these fasteners are installed at an improper angle. These small nicks or chips may not result in immediate breakage. However, over time, as the glass expands and contracts, stress concentrations can develop around the nick, leading to breakage. In the case of tempered glass the entire unit usually breaks. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Spontaneous glass breakage」の詳細全文を読む スポンサード リンク
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