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I thought windshields are tempered and laminated. Not that it significantly changes what you said. Just explains why occasional shards flying away from windshie
by vlehto 11y ago
I thought windshields are tempered and laminated. Not that it significantly changes what you said. Just explains why occasional shards flying away from windshields are not that sharp.
- Natsu 11y agoI have never heard of a glass that's tempered & laminated. I'm not sure you could temper a glass flat enough to laminate it, either--it moves on rollers during the entire tempering process to keep it (mostly) flat, but it's nowhere near as flat as it is coming from the float plant and distortion is measured as part of the QC process. You also can't temper any laminate that I know of--the liner would simply melt and cause a mess in the furnace. Our tempering furnace operated in the 700-800F range. They might seam the edges of the laminate, though, like you do with annealed glass before tempering. I didn't work with windshields, only window glass, including some 6mm clear tempered that went to Google.
- vlehto 11y agoTempered laminated exists. But I can't find anything about it being used in car windshields. My bad, sorry. The way I would do it would be chemical tempering before laminating. Then you probably have lot less warping.
- Natsu 11y agoYes, the break pattern of a windshield is consistent with annealed glass. If it were tempered, the entire window could become an opaque white whenever it was damaged by a rock and that just wouldn't be safe. Not that the 'spiderweb' pattern is easy to see through, but it's better than being fully opaque. I'm not familiar with any tempered laminates as we never made such, but a chemical process sounds more reasonable than trying to get laminated glass through a tempering furnace or laminate two tempered lites.