QUOTE
"When tempered safety glass fractures it disintegrates into hundreds of small
granular fragments which have rounded or blunt edges. Such small bluntly-edged pieces
generally cause less injury than regular glass fragments. The tempering process creates
a tough "skin" on the surface of the glass which is referred to as the "compressive
surface." If the compressive surface of the glass is penetrated for any reason the window
will spontaneously fracture and disintegrate into hundreds of small pieces. All failures of tempered safety glass originate from penetration of one of the compressive surfaces on the glass.
Ford has received reports of spontaneous breakage of side windows of
vehicles parked in driveways, vehicles traveling on the road, vehicles passing each other,vehicles hitting potholes, vehicle doors slamming, vehicle windows breaking in car
washes, and other situations.
Ford's expert testified that the typical scenario for such spontaneous glass
breakages is that a small scratch or chip is inflicted on one of the window surfaces from
rock chips on the road, grit or sand lodged between the window and window seal, or
sharp objects coming in contact with the glass surface. Typically such scratches or chips
are not visible to the naked eye and, over time, the scratch or chip enlarges to the point
that it penetrates the compressive surface, although it is still too small to be noticeable.
Spontaneous glass breakage of tempered glass occurs on all models of vehicles regardless of manufacture and vehicle line. Ford's expert testified that even today there is no technology available to avoid occasional breakages of this type.
Both Ford's expert and Wise's expert testified that Ford experienced higher than
expected breakages of side windows on Ford Escorts produced between 1981 and 1987.
In mid-1985, Ford engineers investigated the problem and concluded that on some Ford
Escorts, the glass surface of the window could come into contact with the edge of a metal
bracket in the door frame when the window was rolled up tightly (highly torqued)
creating a scratch on the compressive surface of the window."
Almost all of the people on that page said they had the window open or the sunroof, the sunroofs broke/shattered not exploded. I only read the page once but didn't see any info relating to window tinting causing the problems - just small stones causing a fracture that got bigger and eventually caused a big weakness leading to the sunroof falling to bits...