For what reason did the glass door suddenly break?

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Last night there was a huge explosion in our house – suddenly our glass door shattered into a thousand pieces on the floor. The door had been installed four years ago and there was no visible damage. Has anything like this ever happened to you?

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Yes, we had that happen years ago. It looks like spontaneous failure due to nickel sulfate inclusion. It happens in about 2% of all doors, is a material defect and therefore is actually a warranty case. But it would be hard to prove.

We were lucky at the time that the door was completely cracked, but it stayed cracked long enough for me to take a picture. And the photo shows that the cracks appeared somewhere in the middle of the door, so it wasn't a bump or anything like that.

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