what tape?

[ceebdub]

I make Daguerreotype photographs which require sealing behind glass. In cross section I have the metal plate .5mm thick , a paper gasket (to keep glass away from plate) and the glass. What I have been doing to seal the edges to stop oxidisation of the plate was to tape it. I originally used insulating tape, but I have noticed on the museum glass I use that it peels off the glass after a few months. It doesn't matter what the tape looks like as it is all hidden behind a window mound.There can only be about 3mm of the tape showing on the front of the glass.
Anyone recommend a conservation tape for this?

[prospero]

Try Filmoplast P-90. It sticks like the proverbial to glass.

[framemaker]

Sounds like an application for aluminium foil tape. Given a good burnish the acrylic adhesive will adhere very well to the glass, and the aluminium layer is as effective gas barrier as you will get.

aluminium tape

[ceebdub]

Do you know if the adhesives are 'conservation' quality on either of these tapes as the adhesive will be touching the edge of the plate, all be it in a very small way?

[prospero]

Make the glass a smidgeon bigger.

[ceebdub]

I can do that, bigger glass if it is being framed, but if people want them in a case it makes it harder as in means the case has to get bigger, and the surround, which traditionally is quite narrow.

[Roboframer]

I'm confused!

From a previous topic ....................

Just so you all know how a Daguerreotype image works . The image is on a silver plate it then has a brass spacer and a sheet of non reflective glass on that. The whole thing is heated and sealed around the edges(hopefully for ever) So what you have is a unit that is metal, metal glass in section. The edge is messy so has to be hidden, there is no other way of doing it.

So why is the spacer a 'paper' one now instead of a brass one and why are you looking for a tape for the sealing when you already had a heating method?

[ceebdub]

the heating is not a method, just a way of making sure its not damp inside the enclosure. After that the edge needs sealing. I either use a paper or a brass gasket to keep the silver plate from touching the glass.

[ceebdub]

gone for the p90 , seems like the stuff, thanks.