An oven door shattering without warning can be alarming, especially when it happens during routine cooking. This issue is most often linked to the type of glass used and to tiny imperfections formed during manufacturing. Many modern ovens are built with tempered soda-lime glass, which is engineered for strength but can react poorly to sudden temperature shifts. Some higher-end appliances use borosilicate glass, which handles heat changes better, though no glass is completely immune to damage.
In many cases, the cause lies deep within the glass itself. Microscopic flaws, including mineral particles such as nickel sulfide, can remain invisible for years. When exposed to repeated heating and cooling cycles, these particles may expand slightly, creating internal stress. Over time—especially during high-temperature functions like self-cleaning—this stress can reach a breaking point, leading to a sudden fracture even when the oven appears to be operating normally.
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