Why Do Oven Doors Shatter and How to Prevent It?

Oven glass doors can shatter for two main reasons: the type of glass used and tiny hidden imperfections inside the glass itself.

Most oven doors are made with either tempered soda-lime glass, which is common but more sensitive to sudden temperature changes, or borosilicate glass, which is generally more resistant to heat stress. Even so, small internal flaws — such as nickel sulfide inclusions — can sometimes cause the glass to break unexpectedly, especially during or after intense heat cycles like self-cleaning mode.

To help prevent this from happening, it’s important to handle the oven door gently, avoid slamming it, and never place heavy cookware or baking dishes on the open door. You should also make sure pans or dishes inside the oven don’t touch the glass, since direct contact can create stress points.

A few simple habits can make a big difference: use soft cleaning tools instead of abrasive scrubbers, avoid exposing the glass to sudden temperature shocks, and be careful during high-heat use. These small precautions can greatly reduce the risk of shattering and help keep both your kitchen safer and your oven in good condition.