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Old 12-05-2019, 02:47 PM
Shawn Everette Shawn Everette is offline
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uv delamination

Hey ya'll. So I'm trying to help out my partner on a restoration project at a museum. She's got an assembled cut and polished piece that is starting to get the tell tale delam ferns growing at the seams. There's an odd oil slick look to part of it, which I haven't come across before. We think that it was bonded with a UV, which I know is not our favorite. Anybody have experience on how long to expect complete failure?
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Old 12-05-2019, 03:14 PM
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Pete VanderLaan Pete VanderLaan is offline
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Complete failure? It probably won't but it will continue to look worse and worse. The "artifact" or the fern is the result of inadequate exposure to the UV source. The ring may well indicate how flat the two surfaces were at the time of joining them. Newton rings sugggest very close fits.
During the period when I was trying to use UV before abandoning it was that the light source needs to be warmed up. We finallly kept our light under a cardboard box running all day. If you don't warm them up, the filament develops a coating that interfers with the bonding.

I've taken them apart using Methyl Chloride ( Toxic) but it's a lot faster to bite the bullet and saw them, resurfacing everything and this time doing it in Hxtal.
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Old 12-05-2019, 03:44 PM
Shawn Everette Shawn Everette is offline
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Any chance you could manage to properly cure what hasn't started to come apart. Given the dogma of museum conservation disassembly probably isn't happening, certainly not with a saw.
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Old 12-05-2019, 05:59 PM
Jordan Kube Jordan Kube is offline
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Quote:
Originally Posted by Shawn Everette View Post
Any chance you could manage to properly cure what hasn't started to come apart.
My gut feeling says no but that's the easiest place to start. Won't cost anything. If it doesn't work you're still at present condition.

I know it's not your problem but I would recommend they contact the artist and try to work out a remedy. Museums should have museum quality work, which this piece is not at this point. If the artist isn't interested(I'm assuming they are still around) stick it in a box in back and let it fall apart out of public view.
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Old 12-05-2019, 09:23 PM
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Scott Dunahee Scott Dunahee is offline
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can't you bring it up to temp and burn out the uv glue connections then reassemble after cleaning with hxtal?

Just asking.

BSD
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Old 12-05-2019, 11:23 PM
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David Patchen David Patchen is offline
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Quote:
Originally Posted by Scott Dunahee View Post
can't you bring it up to temp and burn out the uv glue connections then reassemble after cleaning with hxtal?
BSD
This is what the artist should do. If he won't, this is what I would do. I've taken pieces off of bases by bringing them up and down through another annealing cycle. The UV turns dark brown and fails. It isn't easy to get off but a super clean razor blade and some acetone should do the trick. Maybe a cork belt and cerium if it's really stubborn. Then re-assemble with hxtal.
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Old 12-05-2019, 05:30 PM
Larry Cazes Larry Cazes is offline
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Quote:
Originally Posted by Shawn Everette View Post
Anybody have experience on how long to expect complete failure?
Exactly 1 year 3 months and 10 hours. Thats give or take a few seconds of course.
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