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## How to Prevent Oven Door Shattering and Why Do They Happen?
It’s a typical evening—you’ve preheated your oven for dinner, only to be startled by a loud *boom* followed by shattered glass all over the kitchen floor. If this sounds like a scene out of a kitchen horror story, you’re not alone. Oven doors shattering, while rare, **do happen**, and understanding the reasons behind this surprising occurrence can help you prevent it.
### Why Do Oven Doors Shatter?
Modern oven doors are made of **tempered glass**, which is designed to be heat-resistant and strong. Tempered glass is made through a rapid heating and cooling process that strengthens the glass, but it also gives it one notable property: if it breaks, it shatters into small, blunt pieces rather than sharp shards.
However, despite its strength, tempered glass can still break under certain conditions:
#### 1. **Microfractures or Hairline Cracks**
Small scratches or chips on the surface of the glass—caused by cleaning tools, utensils, or accidental bumps—can weaken the glass over time. These microfractures may expand with repeated heating and cooling, eventually leading to a sudden shatter.
#### 2. **Thermal Stress**
If there’s an uneven temperature distribution across the glass (like spilling cold water on a hot door or placing a frozen dish inside a preheated oven), it can cause thermal stress. This stress may push the glass beyond its tolerance and result in breakage.
#### 3. **Manufacturing Defects**
In some cases, the fault lies in the manufacturing process. Inclusions—tiny impurities trapped in the glass—can cause it to fail spontaneously. If this happens, it often occurs within the first few years of owning the oven.
4. **Improper Installation**
An oven door that wasn’t installed correctly may place uneven pressure on the glass. Over time, this tension can weaken it, especially during heating cycles.
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