High Temp Silicone

Is 500 degree silicone sufficient to use on the combustion motor flange?

Use flat fiberglass gasket rope.

Rope gasket would be too thick. Half of the flange fits into a housing that's welded to the back of the stove. The housing (I'm sure there's a better word to describe it) holds one side of the flange tight to the stove, the other side is bolted. There is just enough play that the combustion motor starts rattling but, if there wasn't any play, you wouldn't be able to remove the combustion fan assembly.

So, I'm looking at either high temp silicone or furnace cement. The silicone would dampen it the best but, I'm not sure if 500 degree silicone would hold up on the back of the stove.

Kaowool. PM me you address and how much you need, I will send you some.

Use the kaowool if you don't you'll have one terrible mess. Any good local plumbing shop should have it. The plumbing shop right down from me sells it. The piece in the picture was about $1.50 if I remeber correctly. They carry 3/32 thick all the way up to 1" thick. They use the stuff to seal up combustion blowers on pellet stoves.

This is on a combustion motor flange??? is the paint burnt off the flange?? If not the 500* silicone will work fine. I can't believe that any electric motor blowing air through a mounting flange can have temps exceeding 2-300* or the motor would burn up in short order.

I say go ahead and give it a try. Use small quantities.

Greg L

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The only part of a stoker stove exterior that gets over 500*F in my experience is the stove body near the fire (sides and front), the rest of the areas get hot but not that hot. Even the doors are isolated by the rope gasket and the hinge connection, my doors usually measure 400*F max.

I use 500*F silicone to attach the fiberglass rope to the doors. No issues or problems with that. I also use it under the combustion fan flanges to seal and isolate for noise purposes, works great. On the Harman Magnums the fans just slide into a slot, they will back out and rattle if I don't put a small bead on each slot. The silicone has amazing adhesive qualities, I have to slice the bead to get the combustion fan out!

Of course kaowool works too.

Matthaus wrote:The only part of a stoker stove exterior that gets over 500*F in my experience is the stove body near the fire (sides and front), the rest of the areas get hot but not that hot. Even the doors are isolated by the rope gasket and the hinge connection, my doors usually measure 400*F max.

I use 500*F silicone to attach the fiberglass rope to the doors. No issues or problems with that. I also use it under the combustion fan flanges to seal and isolate for noise purposes, works great. On the Harman Magnums the fans just slide into a slot, they will back out and rattle if I don't put a small bead on each slot. The silicone has amazing adhesive qualities, I have to slice the bead to get the combustion fan out!

Of course kaowool works too.

Do you just apply the sealant and bolt it together or let it skin over a bit for better dampening properties?

What RTV do you buy? I have tubes of the black metallic stuff lying around. High heat...

av8r wrote:Do you just apply the sealant ...What RTV do you buy?

I just put it together, have not really been worrying the noise angle aside from securing from rattles, I would imagine letting it cure for a few minutes first would be a good idea for that.

I get mine on ebay 6 tubes for 11.95 (black), if you do a search on hi temp silicone you can usually find some deals. It is rated at 600*F on some buys and 500*F on others, seems to be the same stuff. I do know the burnt orange rtv is higher temp, we use it at work and it's rated at 750*F.

Thanks for the replies. Checked into kaowool but, it is too thick. I found 700 degree silicone, after the fact, which would have been my preference. Ended up using high temp gasket glue and sealer. I'm not sure if it helped or not.