Silicone vs stove cement

tcalo · Post by **tcalo** » Mon. Oct. 16, 2017 9:29 pm

I was wondering if anyone has used high temp silicone in place of furnace cement when assembling a stove? I believe Scott touched on this subject relating to the build of his PP Stewart. Is there an advantage of one over the other? It seems that a high temp silicone in a tube would be much easier to use. I'm not sure of the temp ratings, maybe they won't hold up to the heat in some areas?

Post by **Lightning** » Mon. Oct. 16, 2017 9:55 pm

I haven't seen a silicone that could stand more than 600 degrees, but maybe I'm looking in the wrong places. Furnace cement is good up to 1200.

hotblast1357 · Post by **hotblast1357** » Tue. Oct. 17, 2017 6:58 am

I used a tube type product when assembling my boiler, I will look tonight to see what it is called, it’s not really a silicone as it has fibers in the material, seems good so far, and I know the rating is over 1,000 degrees.

Sunny Boy · Post by **Sunny Boy** » Tue. Oct. 17, 2017 8:51 am

tcalo wrote: ↑
Mon. Oct. 16, 2017 9:29 pm
I was wondering if anyone has used high temp silicone in place of furnace cement when assembling a stove? I believe Scott touched on this subject relating to the build of his PP Stewart. Is there an advantage of one over the other? It seems that a high temp silicone in a tube would be much easier to use. I'm not sure of the temp ratings, maybe they won't hold up to the heat in some areas?

Tom,
Yes, Scott posted a link to a very high temp silicone sealer. It was the first I'd read about any rated over the usual 600F of other high temp silicones. If I remember, it was rated over 1000F. I'll see if I can find the link, if Scott doesn't repost it before then.

BTW, the Hercules furnace cement, that some of the stove restorers use, does come in a calking gun tube, so it can be put on with less mess, like silicone in a tube.

Paul

tcalo · Post by **tcalo** » Tue. Oct. 17, 2017 10:29 am

Sunny Boy wrote: ↑
Tue. Oct. 17, 2017 8:51 am

BTW, the Hercules furnace cement, that some of the stove restorers use, does come in a calking gun tube, so it can be put on with less mess, like silicone in a tube.

Paul

Good to know. Thanks

rberq · Post by **rberq** » Tue. Oct. 17, 2017 3:09 pm

I have successfully used high-temp silicone in areas that don't get above 600 degrees.
However, I used it around the flue collar and it did not hold up.

scalabro · Post by **scalabro** » Wed. Oct. 18, 2017 8:24 am

Tommy, this is what I had Skip assemble the base of the Stewart with. However, it has to be fired within 30 days of application. So he put the entire base in one of his ovens after assembly

http://www.deaconindustries.com/product-display/d ... -8875-thin

The rest of the stove is assembled with plain old Rutland cement....

hotblast1357 · Post by **hotblast1357** » Wed. Oct. 18, 2017 8:52 am

This is what I used, when assembling my boiler.

Sunny Boy · Post by **Sunny Boy** » Wed. Oct. 18, 2017 8:54 am

Scott, somewhere in your posts, didn't you also list some silicone sealers that were rated higher than 600F ? Or did I dream that ?

Paul

lsayre · Post by **lsayre** » Wed. Oct. 18, 2017 11:22 am

Permatex Red High Temperature RTV Silicone adhesive is good up to 650 degrees.

https://www.permatex.com/products/gasketing/gaske ... ne-gasket/

scalabro · Post by **scalabro** » Wed. Oct. 18, 2017 4:51 pm

Sunny Boy wrote: ↑
Wed. Oct. 18, 2017 8:54 am
Scott, somewhere in your posts, didn't you also list some silicone sealers that were rated higher than 600F ? Or did I dream that ?

Paul

Hahahahaha I don't think you're dreaming but I'll go back and look...

Post by **coaledsweat** » Wed. Oct. 18, 2017 5:48 pm

Please keep in mind that silicone temp limits are "intermittent" rated and for that reason probably not the best thing to use in a coal fired application.

scalabro · Post by **scalabro** » Wed. Oct. 18, 2017 6:55 pm

This would work on a base assembly I guess...

https://www.superior-industries.com/seal_and_assi ... t_242.html

Paul,
I looked over my Stewart thread and can't find anything

KingCoal · Post by **KingCoal** » Wed. Oct. 18, 2017 7:39 pm

non melting and odorless, that's one i'd try.

i tried one from Deacon when i first put T.O.M. into service, it ran and stank. i shut the stove down just to get it all out and off it then used heavy felt type tape from ACE sold for sealing Big Green Egg grills.

i love that stuff, it seals everything that is fitted to the barrel on TOM now.

it will not work for fitted cast joints like ash chambers, base chambers, lids to barrel, firpot supports, barrel to ash chamber, that type of thing.

Sunny Boy · Post by **Sunny Boy** » Thu. Oct. 19, 2017 10:23 am

scalabro wrote: ↑
Wed. Oct. 18, 2017 6:55 pm
This would work on a base assembly I guess...

https://www.superior-industries.com/seal_and_assi ... t_242.html

Paul,
I looked over my Stewart thread and can't find anything

Thanks for looking Scott. Guess I did dream it.

I can't find any rated over 600F with an internet search. I've used the red 600F on the plenum and stove pipe joints of an oil-fired furnace I had in my last shop. Almost made it through the first winter before it got cooked and leaked.

Paul

Silicone vs stove cement

Attachments