Silicon Glue

[yossiantokolitz]

Apologies. There must be a thread on this somewhere but I seem to bee ocwored at using the search function. What would be a good glue to use for silicon sacks. As an Israeli I probably cant find most American / European brands so more interested in type and what to look for in glue. I can find the E6000 will it do the did?

Thanks

Yossi

[BaronWulfraed]

Not a recommendation, just the first thing that seemed a candidate when searching for "silicone cement glue" (silicon, no-e, is a metallic element). https://www.smooth-on.com/product-line/sil-poxy/ is shown being used for repairing silicone molds, so might be usable for silicone sacs.

 

That's presuming standard "sac cement"/shellac won't stick.

[Tweel]

E6000 craft glue will not stick to silicone.

 

If you can't find what you need locally, you might try a pet shop, such as JerusalemPetShop, and ask if they have silicone aquarium sealant. That would probably work, and it's a neutral cure silicone that does not emit acetic acid.

[yossiantokolitz]

Thanks a lot for the answers. I might even have some aquarium sealant at home. Should have thought of it myself.

Yossi

[Ron Z]

You need a silicone RTV (room temperature vulcanization) compound . It's the only thing that will stick to silicone. There is a thread in the repair forum in which I go into this in some detail.

 

You want a non-corrosive type, and the tube will be marked as such. Most of the more readily available RTV silicone adhesives release acetic acid. The non-corrosive RTV type release an alcohol.

[OMASsimo]

I use shellac for both silicone and latex (rubber) sacs and never had a problem with this. Shellac will not attack the material and can be removed when needed.

 

Ron, could you point me to the thread you mentioned? Thanks.

Edited July 2, 2019 by OMASsimo

[Ron Z]

Shellac will not stick to silicone. Sorry, it won't, it doesn't, and really doesn't hold the silicone sac on the sac nipple. PVC sacs, yes, latex sacs, yes. Silicone, no. The only thing that sticks to silicone is silicone.

 

I finally found the post. Rather than give a link and make you wade through 4 of the 5 pages to find it, here's what I wrote:

 

 

I had to go back and look at my notes. Its been 5 1/2 years since I looked into this, and in the interval I quit using the silicone sacs because of the gas permeability issues, so the silicone I had expired long ago and got tossed.

 

The common RTV is an acetoxy compound, and releases acetic acid when curing. This is why it is considered to be a corrosive RTV. That isn't the issue with pens, but the release of acetic acid around celluloid could be, so it may be good to avoid it, or leave it open to air until it cures - roughly 24 hours..

 

So I went looking for a good non-corrosive RTV, and had a long conversation with the folks at Loctite. There are other forms of RTV curing materials, but the one recommended is an Alcoxy RTV. This releases alcohols - mostly a combination of methyl and ethyl alcohol. Loctite makes one called 5040 self leveling RTV. It's a bit pricey though, and you'll need to order it. I found it at a number of sites, including Amazon.

Another possibility is Loctite 598, which is an oxime cure RTV, and is much cheaper than the 5040. You can find it on ebay. This releases methyl-methyl keytones, but the quantity would be rather small in this application.

 

If you're not sure about what a product releases, take a look at the technical data sheets. There's a wealth of information for those who take the time to dig for it.