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Old 08-10-2009, 19:12   #1
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Portlight Glass

Is it OK to use tempered glass in an opening portlight? The glass that I removed is 2 pieces laminated together but I've been told that tempered is stronger....these are 6" ABI round portlights

Thanks for any input
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Old 08-10-2009, 19:22   #2
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I would stay with the laminated glass, tempered glass may be stronger but when it does break it shatters into very small pieces. When I replaced my portlites I went with the laminate cheaper and it may stay in place with a lot of crackes but better than no glass at all
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Old 08-10-2009, 20:48   #3
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Stick with safety glass. All of my 40 year old opening ports are cracked. With the safety glass, they are still water tight. If they were tempered, I'd have four gaping holes in the cabin side.
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Old 08-10-2009, 20:58   #4
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Automobile windshield and other windows are all safety glass - the two layers with the plastic between. You can get junk yard car windows and take them to a glass shop and have them cut the circles you need.
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Old 08-10-2009, 22:05   #5
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Originally Posted by osirissail View Post
Automobile windshield and other windows are all safety glass - the two layers with the plastic between. You can get junk yard car windows and take them to a glass shop and have them cut the circles you need.
well damm... that is smart...

thanks!
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Old 09-10-2009, 05:00   #6
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Safety glass is the way to go, I have them in all my ports. I've had to replaced 3 of them, wish I would have thought to use some old automobile windshield glass. Well there is always next time.
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Old 09-10-2009, 06:41   #7
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Automobile windshield and other windows are all safety glass - the two layers with the plastic between. You can get junk yard car windows and take them to a glass shop and have them cut the circles you need.
I believe that most manufacturers now make car windows out of tempered & laminated safety glass. This means that the glass has been cooled in such a way to induce tension in the exterior skin, while the interior is in compression.

Tempered safety glass cannot be cut
by hand without shattering it.

Glass that is merely laminated can be cut.

See also ➥ Drilling Tempered glass - possible ???
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Old 09-10-2009, 08:16   #8
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well damm... that is smart... thanks!
Well actually it was an expensive lesson learned - I had two 8" replacement pieces of glass shipped in from Asia by ABI for over $100 each. Then they did not fit so I had to go to a glass shop to have them sanded down to proper size. The shopman said "why didn't you just come here and I would have cut what you needed out of a broken auto windshield?" A good auto glass shop can cut the circles easily as they "know how" to do it.
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Old 09-10-2009, 08:53   #9
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We're reglassing all 10 of our crazed portlights with laminated auto glass. $30 each for the 4 1/2" x 9 3/4".
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Old 09-10-2009, 08:58   #10
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Automobile windshield and other windows are all safety glass - the two layers with the plastic between. You can get junk yard car windows and take them to a glass shop and have them cut the circles you need.
Side windows are tempered, only the front windshield is laminated (not tempered).

Tempered safety glass is available- the glass is cut to size first, then tempered , then laminated. (You can't cut tempered glass). PM me if you want to go that route (it's pricey).

We decided against laminated glass when we replaced our ports and went with tempered (but it's 3/16" thick-and LOF stamped)
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Old 09-10-2009, 09:02   #11
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We were told for tempered they have to be custom made.....
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Old 09-10-2009, 09:05   #12
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We were told for tempered they have to be custom made.....
Yep, that's correct.. the glass is sized and edge polished , then tempered.
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Old 09-10-2009, 09:39   #13
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usually you can tell if the glass is tempered. there are some very small indents in the glass as if made by a small nail. 1 in each corner I recall. I would go with laminated safety glass.
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Old 09-10-2009, 09:43   #14
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I believe that most manufacturers now make car windows out of tempered & laminated safety glass. This means that the glass has been cooled in such a way to induce tension in the exterior skin, while the interior is in compression.
Maybe it's different in Canada, but in the States the windshields are not tempered, and the side windows are tempered, not laminated.

Note. I replaced the windshield and a back glass on my '01 Suburban last year so I know this personally.
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Old 09-10-2009, 10:28   #15
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Well actually it was an expensive lesson learned - I had two 8" replacement pieces of glass shipped in from Asia by ABI for over $100 each. Then they did not fit so I had to go to a glass shop to have them sanded down to proper size. The shopman said "why didn't you just come here and I would have cut what you needed out of a broken auto windshield?" A good auto glass shop can cut the circles easily as they "know how" to do it.
Is the autoglass thick enough?

Thanks
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