T-7000 Adhesive

[xrunner]

I ran across this adhesive on Amazon browsing for this and that. I never heard of it, so I ordered a tube to try. It seems to be mainly for phone and tablet repair. However, after saying that it says that it's good for almost anything. The blurb at the top of the tube is rather amusing

I will be trying it out on a few test items, but I wanted to ask the members here if they have any experience with T-7000 and what uses they think it's good for.

Thanks.

[Alex Eisenhut]

Never heard of it but I always need something to glue back bits of fiddly plastic that fall off my vintage computers. I  might order this glue...

[jpanhalt]

It's hard to find an SDS for that product.  Google is getting worse by the day.  The name is apparently not unique.  For Suxun I found this:


That describes it as an epoxy,   But this report from an EU safety entity suggests the same name (different brand) is something else: https://ec.europa.eu/safety-gate-alerts/screen/webReport/alertDetail/10008250?lang=en

When you get it, the smell should give a clue.

Duckduckgo had more information (no SDS).  It's described as a "super glue," and its major constituent is methyl methacrylate.
https://gluesavior.com/what-is-b7000-glue/  B7000 is the clear version.  I am incline to go with that description rather than the epoxy description.

[xrunner]

Yes B-7000 seems to be the same but clear.

Watched a video where a person tested how these glues dried after 24 hrs. Looked they were squirted out in a line in the open air (not trying to glue parts together) on something like a cutting mat.

B-7000
T-7000
E-8000
T-8000

All of them, after 24 hrs, were dried but still a flexible substance - not at all hard as a rock. I'll try to glue some things together tomorrow and see how the T-7000 holds up.

[jpanhalt]

E6000 by Eclectic Chemical  is a solvent evaporation adhesive that I use.  It takes overnight to cure, is not sticky, and yet it is flexible, and has great peel strength.  I use it to attach push rod sleeves in model sailplane fiberglass fuselages.  It's superior to epoxy IMHO.  Superglues  can cause delayed severe damage to some plastics.  Several large models crashed because the guide sleeves broke into many pieces.

The odor will give a good clue.  Acrylics will have a sharp plastic smell. Toluene has a unique smell.  And E6000 has a sweet odor like a halogenated (chlorine) hydrocarbon.

[NiHaoMike]

I have to agree with E6000 being a great adhesive. Main downside is that it's stinky, best to have it dry outdoors.

[amyk]

The odor will give a good clue.  Acrylics will have a sharp plastic smell. Toluene has a unique smell.  And E6000 has a sweet odor like a halogenated (chlorine) hydrocarbon.

That's because E6000 is basically polystyrene dissolved in tetrachloroethylene.

[jpanhalt]

E-6000 is not dissolved polystyrene; although, its composition has some similarities.  You can get its SDS here: https://www.ellsworth.com/products/adhesives/solvent-based/eclectic-e6000-industrial-strength-solvent-based-adhesive-medium-viscosity-clear-3.7-oz-tube/

The two major components, ethenyl benzene -- aka styrene --and butadiene, react to form a copolymer known generically as SBR rubber.  The tetrachloroethylene (PERC) is a solvent and apparently acts to  inhibit that polymerization by dilution  or other inhibitors are present. The resulting rubber is not polystyrene. 

Moreover, the rubber is a reactive product and is not easily dissolved in PERC.  Polystyrene dissolved in PERC would redissolve.  I don't know whether the product from E-6000 is the same as the copolymer used in tires and so forth, as chemists can manipulate copolymerizations with various additives and/or changes in the ratios of reactants .

There is a nice description of SBR rubber on Wikipedia (https://en.wikipedia.org/wiki/Styrene-butadiene#:~:text=7%20References-,Types,method%20called%20%22short%20stopping%22.)

[xrunner]

Testing a couple of things. I glued together two scrap pieces of PLA, and a wire on top of PLA. After about 1.5 hrs the PLA pieces are attached very strongly, resisting being pulled apart. The wire is holding tight and the T-7000 glue is like rubber not hard but slightly rubbery. It would work well for holding wires in place on a PCB. So far so good.

[jpanhalt]

What's it smell like?

PERC? (I find it pleasant, but that's subjective.)
acrid (like most superglues)?
like burned polystyrene?

Did it go on like other adhesives (e.g., toothpaste) then cure/evaporate down to what you see?
 

[xrunner]

What's it smell like?

PERC? (I find it pleasant, but that's subjective.)
acrid (like most superglues)?
like burned polystyrene?

Oh boy I'm not that great of a smell judge. I found something the smell compares to though. It smells like the bottle of MG chemicals red insulating varnish I have.

Did it go on like other adhesives (e.g., toothpaste) then cure/evaporate down to what you see?

Pretty much yea. It came out like a thick substance and then it evaporated down and shrunk a bit.

[Fraser]

I discovered B7000 and T7000 some time ago when watching a video that showed it being used to bond a phone screen to its casing. Once I tried it, I was hooked. It is such a useful adhesive for all manner of applications. I regularly use the black T7000 in the tube size that provides a metal ‘needle’ tip for controlled application. It dries to a good strong adhesive but it remains somewhat flexible which can be an advantage in some applications. I use B7000 and T7000 to secure large capacitors and heavy components to PCB’s and it works very well in that application. I have bought B6000 and understood that it had a different viscosity to B7000 allowing it to flow more.

For laptop casing repairs I use plastic welding fluid from model shops. It is used in the construction of ABS model kits and melts the two surfaces together forming a strong bond without an adhesive sandwiched in the joint. T7000 might be useful in that application but I tend to use it on laptop lid hinge screws after tightening to stop them coming loose again. As I said, it remains flexible so may not be the best choice if the glued parts are subject to tension or twisting forces.

Fraser

[jpanhalt]

Pretty much yea. It came out like a thick substance and then it evaporated down and shrunk a bit.

I think that pins it down.  Neither epoxy nor methacrylates will show that much change in volume.  E6000 does as does T-7000.   Added to that is the tenacity and flexibility.  It seems to be in the same family as E6000, i.e., an SBR rubber. 

The disadvantages for fixturing is the relatively slow action vs. hot melt or cyanoacrylate adhesive, and it is much harder to release from than hot melt.  After it has cured overnight, try removing it.  You will probably need a razor blade.

Thanks for sharing with us.

[xrunner]

I tested the two parts I glued yesterday this morning. It was very difficult to break the two PLA pieces apart. Part of one of the pieces broke off before I could get them to break where the glue was.

The wire glued to the PLA with it's insulation on was difficult to pull out. I was afraid it would slip right out of the glue but it didn't.

So yea, I like this glue and I'm sure I will find uses for it here. 

[rsjsouza]

E6000 by Eclectic Chemical  is a solvent evaporation adhesive that I use.  It takes overnight to cure, is not sticky, and yet it is flexible, and has great peel strength.  I use it to attach push rod sleeves in model sailplane fiberglass fuselages.  It's superior to epoxy IMHO.  Superglues  can cause delayed severe damage to some plastics.  Several large models crashed because the guide sleeves broke into many pieces.

The odor will give a good clue.  Acrylics will have a sharp plastic smell. Toluene has a unique smell.  And E6000 has a sweet odor like a halogenated (chlorine) hydrocarbon.

I love the E6000. When I moved to the US I had no reference of a good adhesive sold locally and tried a few before landing on the E6000.

This discussion led me to a bit of a rabbit hole and I found some articles that, although having a few typos here and there, seem to have real world experience with these adhesives.

https://www.stickyaide.com/e6000-vs-e7000/
https://www.stickyaide.com/e6000-vs-e8000-glue/
https://www.stickyaide.com/b7000-vs-t7000-vs-e8000/

[Fraser]

Rsjsouza,

Thanks for the links. I had not realised that the B7000 version was an enhanced version of B6000. I tend to use the clear and black 7000 series and have no complaints at all 

Fraser