Quote:
Originally Posted by maxnix
Stress fracture. It's tempered glass, so under tension.
If the dealer balks, escalate your claim to BMW NA immediately.
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...one must become familiar with the concepts of >glass tempering< and >under tension< ........
Tempered glass is NOT under tension. It may be mounted in a way that subjects it to stress but that would be purely unintended due to the fact that tempered glass is brittle due to the tempering process.
Tempered glass is manufactured through a process of extreme heating and rapid cooling, making it harder than normal glass, yet very brittle. This is why shattering of tempered glass results in small pebbles rather than sharp shards. The thermal process that cures tempered glass also makes it heat resistant as well.