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What are the dots on hatch?

 
Old 02-05-2019, 09:44 PM
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Executioner
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Default What are the dots on hatch?

This isn't a picture of my car but mine does the same exact thing? What causes these markings to show up on the back glass? I tried searching the forum but couldn't find anything about it.

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Old 02-05-2019, 09:51 PM
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Joe K
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Window tint maybe?
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Old 02-05-2019, 09:59 PM
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My car doesn't have tint though.
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Old 02-05-2019, 10:05 PM
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skyhawk50
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I was told these spots are caused by the cold air nozzles used when the glass is tempered. This is done so that when it breaks, it fractures into small pieces instead of large shards. Mostly visible when you are wearing ploarized glasses.

Last edited by skyhawk50; 02-05-2019 at 10:05 PM. Reason: spelling
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Old 02-05-2019, 10:28 PM
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Very interesting. Thanks for that info!
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Old 02-05-2019, 10:52 PM
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Photos taken with a polarizing filter. Reduces the reflected glare from the glass, but shows internal stresses. Can see the same thing if you wear polaroid sunglasses. Thats why pilots don't wear polaroid sunglasses, as aircraft windshields have significant internal stress and act as partial polarizers. More than you wanted to know, right?

Last edited by NavAir; 02-05-2019 at 10:52 PM.
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Old 02-06-2019, 10:32 AM
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lrj975
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Looks to me that is solar/infrared blocking technology from that era, from the factory, it is built in to the back glass to block sun and UV, reducing heat inside. Lots of cars had that back then, it was a high-end feature. There was a name for it..

Perfectly normal to have those spots, and nothing you can do about it anyway..
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Old 02-06-2019, 05:25 PM
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Many years ago when I had glass replaced on my 2nd gen Trans Am I was told itís caused from the laminating process.
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Old 02-06-2019, 09:43 PM
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Originally Posted by NavAir View Post
Photos taken with a polarizing filter. Reduces the reflected glare from the glass, but shows internal stresses. Can see the same thing if you wear polaroid sunglasses. Thats why pilots don't wear polaroid sunglasses, as aircraft windshields have significant internal stress and act as partial polarizers. More than you wanted to know, right?
plus, polarized glasses made most of our glass panel instruments unreadable in our aircraft. Short final.........3 greens !

Last edited by skyhawk50; 02-06-2019 at 09:46 PM. Reason: .
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Old 02-07-2019, 02:05 AM
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I wear Serengeti Polarized Drivers and I see this pattern on LOTS of cars on the rear window, but never any others, just the rears. The glasses also obliterate McDonald's new video menus and gas pump readouts.
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Old 02-07-2019, 11:46 AM
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That may be due to the side windows being tempered glass not laminated
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