Heat treat oven insulation?

Robert Mayo

Robert Mayo

Joined
Oct 13, 2005
Messages
1,236
I am in the begining stages of building my oven. I have this insulation fiber board i bought from a ferrier supply house a while ago and would like your opinions on whether it will work in my oven. It has a quilted look on one side and the other side is smooth i originaly bought it to line a propane forge
What are your opinions? Has anyone ever used this type of insulation before? Thanks for any info you ca give me.

Bob
board.jpg
 
How thick is it, what temperature is it rated for? If it was for a forge it should be good for an oven. If theses are fine the only problem I see is how you going to attach your wires? You need to put some grooves in to set your wires in and then you pin the coils in the grooves with pieces of Kanthal wire bend in a hairpin like u. I have the old wire from my kiln and It still makes fine pins. I even have some of the pins from my original kiln. I could toss some in an envelope and mail it to you no problem. I am going on a trip tommorrow and won't be back for a week though. Email me at imviall at hotmail, I check it more than the G mail. Jim
 
Thanks for the offer Jim i have some old wire from a kiln here it is not k type but i'm sure it will work.. I am going to try and router in some grooves on a test piece. If it does not tare it up then i will go ahead and lay it out and router all my grooves in.
Bob
 
Pay a visit to a local pottery/ceramics shop and buy "refractory" bricks .
Should be under $3 per. This is typically what is used in kiln construction. For
mortar, you can use Lowes/HD "high temp mortar" - it is in caulks section,
thick greasy black stuff in the tubes of the same size as typical caulks.

The refractory bricks are typically rated to 2300F (u can get a more expensive
grade, but there's no reason for it).

If you want extra insulation (very little reason for it), you can place
some "ceramic wool" in between the bricks and oven's (typically sheet
metal) exterior.

McMaster carries both the wool and the bricks, but bricks are very fragile
and your typical express carrier will prolly damage 25% of the shipment, so
I recommend you buy in person at a store
 
I just ckecked with the folks i bought the insulboard from and it is rated at max 2300F and is 2" thick so i think i will give it a go. I can always coat the inside with ITC100 if needed. I think this will work and very few seems to worry about heat loss.

Thanks Bob
 
Robert Mayo said:
Thanks for the offer Jim i have some old wire from a kiln here it is not k type but i'm sure it will work.. I am going to try and router in some grooves on a test piece. If it does not tare it up then i will go ahead and lay it out and router all my grooves in.
Bob
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Just a caution, and sorry but I dont recall the exact details: When I made enquiries about Kanthal wire, I was advised that it can become contaminated by other types of wires used for holding pins, or anything else in contact with it. I cant remember whether it melted in , or whether it caused the kanthal to crack or what, but I remember it was a concern. Just make enquiries when you buy the wire for your element to make sure. Sorry I dont recall the exact details.
 
langchop said:
Just a caution, and sorry but I dont recall the exact details: When I made enquiries about Kanthal wire, I was advised that it can become contaminated by other types of wires used for holding pins, or anything else in contact with it. I cant remember whether it melted in , or whether it caused the kanthal to crack or what, but I remember it was a concern. Just make enquiries when you buy the wire for your element to make sure. Sorry I dont recall the exact details.
Click to expand...

Thanks for the info i will be shure and chek it out!:thumbup:

Bob
 
You can make "pins" out of the very same Kanthal that the elements are made out of.
The Kanthal has to be "A1" grade, otherwise it won't last as long. If you're putting 2 spirals
in series, make sure the contact is well thought out, as is the contact between the line-in and the elements .
Stretch the coils out as evenly as you can. Pay special attn to the corners. If "turns" of the spiral touch e.o, the spiral will burn out.
 
rashid11 said:
You can make "pins" out of the very same Kanthal that the elements are made out of.
The Kanthal has to be "A1" grade, otherwise it won't last as long. If you're putting 2 spirals
in series, make sure the contact is well thought out, as is the contact between the line-in and the elements .
Stretch the coils out as evenly as you can. Pay special attn to the corners. If "turns" of the spiral touch e.o, the spiral will burn out.
Click to expand...

The elements i ordered are indeed Kanthal AI 14A. Exellent info can i cut some clip material from the elements themselves?

Bob
 
They are not that long. Just enough to do the job. Let me mail you some ready made ones of AI kanthal. Why mess around when all it will cost me is a stamp. Big deal. You can buy the coffee if we ever meet up. Jim
 
isn't a heat treating oven just made of firebricks and refractory cement? don't recall seeing any flexible material in my kiln :D and wires and buttons?
 
Leu Custom said:
isn't a heat treating oven just made of firebricks and refractory cement? don't recall seeing any flexible material in my kiln :D and wires and buttons?
Click to expand...

I don't recall seeing any flexible material in this thread were do you get that from?
 
ib2v4u said:
They are not that long. Just enough to do the job. Let me mail you some ready made ones of AI kanthal. Why mess around when all it will cost me is a stamp. Big deal. You can buy the coffee if we ever meet up. Jim
Click to expand...

Thanks Jim i sent you a pm with my mailing address.:thumbup:

Bob
 
I taped some of the clips and a couple pieces of some of my old wire you can form into more on a piece of card stock and have it in a envelope addressed to you. I will get momma to drop it in the mail for me. Jim
 
ib2v4u said:
I taped some of the clips and a couple pieces of some of my old wire you can form into more on a piece of card stock and have it in a envelope addressed to you. I will get momma to drop it in the mail for me. Jim
Click to expand...

Jim i got the clips thanks alot for sending them. I have all my parts now so i will start to build the furnace.

Bob
 
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