Anyone know of any heat and water resistant sealant ?

John Young

John Young

Messages
4,330
Name
John
Edit My Images
Yes
Anyone know of any heat and water resistant sealant ?

My fire leaked the other night so now I am trying to patch it for over Christmas and need a sealant that is fire/heat and waterproof :shrug:

any help appreciated as we have no heating at the moment :bang:
 
I'd imagine a wood burning back boiler stove or something. I doubt anyone is daft enough to patch a gas leak with araldite
 
TCR4x4 said:
I'd imagine a wood burning back boiler stove or something. I doubt anyone is daft enough to patch a gas leak with araldite
Click to expand...

I'm trying to get at whether it's a back boiler. Yes.

Ex British Gas Engineer ;)
 
Mahoneyd187 said:
What's "leaking" about your fire?

What fuel is it? i.e. gas
Click to expand...

TCR4x4 said:
I'd imagine a wood burning back boiler stove or something. I doubt anyone is daft enough to patch a gas leak with araldite
Click to expand...

It's a parkray. See THIS thread for details.

:plusone: for that Sealocrete stuff, have used it as a temporary radiator fix in the past.
 
I'm relieved it's not a gas appliance, the idea of somebody stripping their own back boiler/fire and sealing a heat ex with any kind of silicone would be silly.
 
Yeah sorry, still working on stuff (draining the system) My Parkray fire which is a fire with a boiler around it sprang a leak the other night...

I have found about roughly where the leak is (skinned knuckles etc) and I cannot think what to use. I have some sealant which goes to 1500c so I thought great but even when dry it is not water resistant. I also have fire cement but that will be the same so I am not sure. :thinking:

I did think of either exhaust repair putty or instant gasket (for car engine)

The fire will need changing but no one will look at it until the new year and even if they would I dont have £2000 in my back pocket
 
Last edited:
AndyB1976 said:
I've got a little tube of putty that I use for odd fixes here n there after buying it for the exhaust.

Can't say if it will be ok or not for your use however.

This is the one I have.

http://www.halfords.com/webapp/wcs/...uctId_199433_langId_-1_categoryId_255230#dtab
Click to expand...

Yeah that looks good, I have some putty type stuff like that but mine does not seem to be heatproof... that what does mention being used on exhausts so maybe it is.....Hmmmmm


*edit* only good up to 150%
 
Last edited:
If the sealant is not actually exposed to the fire, Halfords will have the solution. Something like Loctite 5920, good to 350 C.
 
If it is anywhere near the water then it will not be that hot as the water conducts the heat away. The water is going to boil at 100 C so the temperature of the ironwork is not going to be that much higher.
 
Oggy said:
If it is anywhere near the water then it will not be that hot as the water conducts the heat away. The water is going to boil at 100 C so the temperature of the ironwork is not going to be that much higher.
Click to expand...

Not sure to be honest, the Parkray is a kind of furnace (coke fuel-led) and it gets VERY HOT in there. I doubt the water in the boiler behind the fire will conduct enough heat away.


The heat resistant sealant mentioned earlier looks good but I cannot find where to buy it (tried B&Q, Homebase and a local hardware shop) its like gold dust
 
Last edited:
Oggy said:
If it is anywhere near the water then it will not be that hot as the water conducts the heat away. The water is going to boil at 100 C so the temperature of the ironwork is not going to be that much higher.
Click to expand...

I understand your logic but that isn't correct. The water only has a split second to heat as it goes from the return,through the heat exchanger,and out the flow. You may be surprised at how hot the surface of a heat exchanger gets, certainly higher than 100c.

And regarding boiling,water can only boil if its vented to atmosphere, there is usually/shouldn't be, air in a heat exchanger. If you get air in a heat ex, you're hear localised boiling, hissing, and kettling.
 
Graham00 said:
We use this at work to seal fire rated ductwork, good stuff
RwzgieTYALSZWG5ZSjynxfz9-tmRwQYuPIOSz_S1vfElqByv08EuPiZX1vJ_ML6-K5pQ9Aa7yxuzY_V76gr4C2ME9U2gdUCU0N8rWB1_bt7pavri86yzfyTYjaA3EmePqPxkdum7z3OmvH-9sxLU4uAYlXyCxw
Click to expand...

Is it waterproof ?

If it is and good heat proofing where can I get it :thumbs:

*edit* just read this

Fire Mate Sealant is an intumescent acrylic sealant that swells when exposed to temperatures in excess of 125°C to prevent the passage of fire and smoke and has a fire rating of up to 4 hours in certain joint configurations


I need more than 4 hours :(
 
Last edited:
nearly all sealants are mastics waterproof, but i see what you mean you need something permanent ? I'm not sure if there is any permanent stuff available, fully brazed or welded is the ideal solution.
 
Graham00 said:
nearly all sealants are mastics waterproof, but i see what you mean you need something permanent ? I'm not sure if there is any permanent stuff available, fully brazed or welded is the ideal solution.
Click to expand...

Yeah I agree but to get at the leak would probably mean dismantling the fire to weld. That's a HUGE remove the fireplace and half the chimney job :bonk:

Does anyone know if exhaust paste (I have some of that) is waterproof when set. I know its heatproof but not sure about water :thinking:
 
Well Araldite (the two tubes you mix together) fixed the leak on my car radiator a few years ago.
Can be bought from the likes of Homebase. There are different ones now and I think it states on the packet what tempretures it stands up to.
 
Copaltite, its what we use to seal up steam turbines, off the top of my head its rated up to 1200 degrees farenheight.
 
Les Key said:
Well Araldite (the two tubes you mix together) fixed the leak on my car radiator a few years ago.
Can be bought from the likes of Homebase. There are different ones now and I think it states on the packet what tempretures it stands up to.
Click to expand...

I will check that out at Homebase later ...thanks

SarahLee said:
This looks like a similar type of thing - but please don't take my word for it :shrug:
Click to expand...

Yeah thank you that looks good but would it be water resistant and how much heat ?

walsh said:
Copaltite, its what we use to seal up steam turbines, off the top of my head its rated up to 1200 degrees farenheight.
Click to expand...

OK where do I buy it from ? and it must be water resistant to then if it stops steam :thumbs:

Just checked homebase and B&Q and nothing for that........
 
Last edited:
Im sure ours comes from a company called Brammer, if you had asked a day earlier I could have picked you up a tube from work!
 
All the stuff from suppliers should have a data sheet with them so you can check for your needs.
 
tiler65 said:
John if you look at this link from the link (CoSHH), it has reference sheet with it.....

http://www.free-instruction-manuals.com/pdf/p4786973.pdf

It says it is Insoluble so it should work for you.
Click to expand...

Thanks, I did look through that but missed that... Hmmm so that means it will withstand the water when set. Or is that something about mixing it with water..

Doing my head in this, time for a coffee :bonk:
 
TheCrewDesigns said:
Thanks, I did look through that but missed that... Hmmm so that means it will withstand the water when set. Or is that something about mixing it with water..

Doing my head in this, time for a coffee :bonk:
Click to expand...

:thumbs: Tom.
It's silicone, so by definition I'd expect it to be waterproof anyway.

Nothing on the sheet about maximum temp, but the other heat retardant silicone's I found online (only available to trade buyers :() were all OK up to 270-300 degrees.

As I said, I really wouldn't take my word for it though - not my area of expertise ;)
 
Could you put a heatbrick inbetween the fire and the break to help with heat absorption? or would that be defeating the purpose?
 
Thank you Sarah, that looks the best bet so far.. I appreciate your help

Hugh - There would not be space for a heatbrick but good idea
 
Ahhh crap just found this about the screwfix stuff. Looks like its not for constant heat just to fireprotect something for short times. Or am I reading it wrong

SX FLAMEGUARD® FIRE RETARDANT SILICONE

A one part alkoxy cure silicone which has excellent unprimed adhesion to most building surfaces and is designed to be used in areas where heat and fire resistance is required.
Fire Rating:
42mm width/12mm depth 60 mins.
20mm width/25mm depth 240 mins.
50mm width/10mm depth 250 mins.
20mm width/15mm depth 320 mins.
In glazing > 65 minutes.
Click to expand...
 
Seriously try some good old silicone sealant. Clean it dry it well and put it on a larger area than you need. A decent codge up. Any small weeps will dry with the heat. Leave it till it drys though..
 
alpina said:
Seriously try some good old silicone sealant. Clean it dry it well and put it on a larger area than you need. A decent codge up. Any small weeps will dry with the heat. Leave it till it drys though..
Click to expand...

But wont it just burn off ?

ChrisH said:
http://www.amazon.co.uk/Evo-Stik-32...819W/ref=sr_1_3?ie=UTF8&qid=1323371490&sr=8-3
Click to expand...

Thanks I saw that before but looks like only suitable for up to 150 degrees C

I was also thinking about some instant gasket like THIS Dosent say on that site but it goes to 250c so might be good enough
 
Last edited:
You must log in or register to reply here.
Back
Top