Pipe Thread Sealant (Red?)

[InjectorService]

Does anyone know what the red selant is that you see on some new NPT thread fittings? I'm looking but cant find anything. I would like something that, if possible, I could pre apply, let dry, and then assemble.

It needs to be fuel resistant and good for only about 150PSI. IT will be used on 1/4 and 1/8" threads.

Thanks in advance guys!

 

[vanapplebomb]

Nothing special. Dyed pipe thread sealant that is applied as a liquid and dried. I have seen them red, green, blue, white, grey, etc... Any Teflon based pipe thread sealant that dries and is somewhat fuel resistant is is going to work.

It is nice to have it dried already. If you apply it wet, it takes a fair amount of time to set. If you apply pressure (particularly air) too soon, it can blow the liquid sealant out of the threads. If it’s already dry, it works just like Teflon tape, but won’t unravel on you.

Be aware, not all pipe dopes dry. I know there is at least one Loctite products which does not set up.

 

[ez-duzit]

Forget the red.

The very best pipe thread sealant is Leak Lock.

 

[MJD1]

545 hydraulic, pneumatic thread sealant.

 

[BlakeTheCarGuy]

I don’t know of any red stuff. I use Permatex Thread Sealant and Permatex Seal+Lock which is thread sealant and blue thread locker mixed so nothing will come loose.


Sent from my iPhone using Garage Journal

 

[darkzero]

The air couplers I buy from HD have red sealant preapplied to them. Not sure what the stuff is but I always scrape it off & just use teflon tape. I don't trust that stuff anymore cause I've had leaks.

For fuel & oil resistance I use Loctite 565 like for the oil fittings on my truck. Never had a leak with the Loctite stuff. But it's not something you can preapply & let dry then use when you need. At least I don't think it can be used that way.

 

[DeeKay]

The air couplers I buy from HD have red sealant preapplied to them. Not sure what the stuff is but I always scrape it off & just use teflon tape. I don't trust that stuff anymore cause I've had leaks.

For fuel & oil resistance I use Loctite 565 like for the oil fittings on my truck. Never had a leak with the Loctite stuff. But it's not something you can preapply & let dry then use when you need. At least I don't think it can be used that way.

+1 for getting rid of that red ****, it never seems to work very well.

I use that 567 on oil and air fittings on our rotary screws, what's the difference between the 565 and 567?

 

[darkzero]

I use that 567 on oil and air fittings on our rotary screws, what's the difference between the 565 and 567?

It's been a while since I've looked it up but IIRC one of them can withstand high temps. I think it was the 567.

 

[InjectorService]

Thanks for all the posts, I completely forgot about this thread for a while.

I was previously looking at Loctite 545, 565, and 567. They are actually all on the same page in the catalog.

The difference between 565 and 567 is that one is high temp.

Whats the difference between 545 and 565 though? 565 is for high pressure?

 

[MacMcMacmac]

545 description seems to emphasize its lubricity and thinner nature to allow it to work well with fine threads on smaller diameter fittings.

 

[MacMcMacmac]

Forget the red.

The very best pipe thread sealant is Leak Lock.

I tried getting a couple of 1 1/4" pipes apart with that stuff on it and I had to sawzall the pipes out.

EDIT: Nope. It wasn't blue stuff, it was red, and hard as the hob of hell.

 

[ez-duzit]

M--you can easily disassemble threads that have been sealed with Leak Lock. And it is good to 5000 psi IIRC.

 

[Super Mech]

Forget the red.

The very best pipe thread sealant is Leak Lock.

X2 on this. The stuff is fantastic. An old industrial boiler mechanic friend of mine turned me on to this stuff long ago.

 

[metaldad]

565 is rated to 300 degrees. 567 is rated to 400.
i use 567.
never used 545. i may go get a bottle. nice color.
if you absolutely do not ever need to take it apart, 554 with primer 'n'
only thing i use blue 'leak lock' for, is electrical conduit. i've had repeated failures with the stuff on refrigerant

 

[picrthis]

to the OP;

the sealant found on them is known as VC-3 (Threadmate), manufactures buy it by the drum but they do have retail sizes available. It's made by Vibra-Tite and can be found in many places. I've been using it for years.

Easiest to find it is amazon, I'm adding a link for your convenience;

https://www.amazon.com/gp/product/B0088YEGXM/?tag=atomicindus08-20