Showered in Glass: Can Glass Shower Doors Really Explode For No Reason?

Uh ... What? Glass shower doors can explode?

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Relax: This phenomenon — while possible — is very rare. An exploding shower door isn't something that's going to interrupt your morning routine. However, a sudden, unexpected failure could leave your bathroom — or you — showered in tiny glass shards instead of the relaxing flow you expected.

What Causes Glass Shower Doors to Explode?

In most cases, the cause of a spontaneous shower door explosion is either a defect in the glass, undetected damage or thermal stresses.

During the tempering process, small particles called nickel sulfide intrusions can make their way into the glass. Shower doors with these particles might be weaker than standard tempered glass. Over time, the glass gets weaker until it finally shatters completely.

Poor installation could also lead to shattered shower doors. The frame or hanging hardware might put excess stress on the glass, and small nicks and cracks at the glass edges could get hidden by the frame. Tempered glass is particularly vulnerable to damage at the edges. It can usually withstand bumps or strikes to the flat part of the glass, but an impact from the side could shatter it.

Thermal stress involves a sudden change in temperature that puts stress on a material such as glass. If different parts of the glass expand and contract at different rates due to uneven heating and cooling, this could cause the glass to lose cohesiveness.

Temperature variations in an indoor environment aren't usually enough to put significant stress on tempered glass. Even switching from hot to cold water or exposing the shower-heated glass to cool air when you open the bathroom door shouldn't lead to an explosive event. The one exception is if the glass already has cracks or inclusions. Damaged glass could be affected by temperature changes that undamaged glass normally withstands.

Some companies that make glass shower doors subject the doors to heat stress in a chamber to test them before sale. However, this type of test — called heat soaking — destroys the glass if there are any inclusions, so many companies don't go through the extra step of heat testing to cut costs.

Why Has My Glass Shower Door Exploded?

Before you can figure out why your shower door shattered, you need to determine whether it was truly an explosion. A shattered door might not have spontaneously exploded. Instead, small cracks might have formed that led to the glass falling out of the frame and breaking into pieces on the floor.

Finding a pile of small glass pieces doesn't mean it was an actual explosion, but the possibility remains. While rare, there are enough reports of exploding shower doors to prove it can happen.

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What Is the Process of the Explosion?

A glass shower door explosion typically starts at a stress point or a spot where there's damage. The process happens quickly in an instantaneous chain reaction from the initial point of shattering.

Tempered glass is designed to shatter into small, dull-edged pieces instead of breaking into large sections with sharp edges. This reduces the risk of harm from shattered glass because you're unlikely to cut yourself on the pieces.

How Likely Is This to Happen to Me?

Exploding glass in a shower is extremely rare. The U.S. Consumer Products Safety Commission reported 2,300 incidents of shattered shower glass doors between 2012 and 2016 — less than 500 incidents a year.

What Can You Do to Prevent It?

The best way to prevent exploding glass shower doors is to regularly check the doors for any chips or cracks. Make sure all brackets and fixtures are properly aligned and not loose.

Avoid leaning on the glass door to reduce stress that could cause breakage, and don't slam the door when closing the shower. If you need support getting in or out of the shower, use a metal bar designed for that purpose instead of holding onto shower door handles or the glass itself.

How Safe Are Glass Shower Doors?

Most glass shower doors are safe. The glass used for showers is typically designed to reduce the chances of this type of accident.

Overall, the chances of your shower door spontaneously exploding are low, so it isn't something to worry about. Maintaining and inspecting the glass on a regular schedule reduces the chances even more.