Seeping threaded fittings... *stainless/brass plastic*

[Deuce]

5776 is an 'anaerobic cure' adhesive. For it to cure it requires (a) absence of air (oxygen in fact) and (b) the presence of metal. See here for details:

Thread Sealant | Thread Sealing | LOCTITE® - Henkel Adhesives North America

So, the reason your excess doesn't cure is that it is in contact with air. Clever stuff.

Indeed. I had assumed it would cure due to moisture in the air as many other products do. Far cleverer this way though - gives me a virtually instant seal yet overspill can be easily cleaned no matter how long it's left.

It's exactly the type of high tech solution I was hoping to find. Bit neater than the old fashioned way too haha!

 

[rpm]

Hope that is a left handed thread in the picture.

 

[Deuce]

Hope that is a left handed thread in the picture.

Good spot! I was about to say maybe the image is reversed but looking closely I can see the direction of the thread 😀

And that image was from some sort of guide/tutorial I think!

 

[rpm]

Good spot! I was about to say maybe the image is reversed but looking closely I can see the direction of the thread 😀

And that image was from some sort of guide/tutorial I think!

TBH, anyone copying that would end up having the problems you experienced and some of the things you said about PTFE tape and fittings, lubricant, sealing and split fittings 😱
I`ve never had any of the issues you talk of in 40yrs.

 

[Deuce]

I`ve never had any of the issues you talk of in 40yrs.

You've never used just PTFE on threads and had a drip occur? That's very good going! I'd say we get a drip/seep per 50 or so connections. But that's critical for us. We have to make hundreds in a single assembly sometimes and all extremely tight and hard to access. Also, we can't pressure test as the systems are not closed, or closeable. We really just needed a virtually impossible to fail solution - which it seems we have now.

 

[rpm]

Oh I`ve had drips and seepages which I nip up or add a smear of something on top of the PTFE, even binned fittings if in doubt but the other stuff you talk of, no never! Perhaps it is the quality of the tape and fittings or the experience of how tight is tight that makes the difference.

 

[Deuce]

Oh I`ve had drips and seepages which I nip up or add a smear of something on top of the PTFE, even binned fittings if in doubt but the other stuff you talk of, no never! Perhaps it is the quality of the tape and fittings or the experience of how tight is tight that makes the difference.

Failure to make a perfect seal is the only problem we have that is frequent enough to cause an issue. The splitting fittings was from a long time ago and due to PTFE combined with silicone. Which does make a perfect seal everytime, but also makes it extremely easy to over-tighten.

Sadly we just don't have the time to cope with little drips. If it was plumbing in my house I'd just sigh and do the connection again. But commercially, If I have 300 threaded fittings built into a slim case that requires makes access almost impossible without disassembly, then I stand to lose a lot of time for the sake of just one failed connection.