Tony Ferguson on mon 4 jul 05
Gene,
I think the ratio is 2 to 1, that is, every 1 inch of ceramic fiber (8# density) is equivalent to 2 inches of softbrick--I think it might even be higher but I am unsure. I would call Smith Sharp (an AP Green Dealer) or other industrial ceramic supply place and they could offer an exact answer for you.
Tony Ferguson
Gene Arnold wrote:
I plan to start construction on a gas kiln soon and plan to use a fiber door. The reason I'm choosing to use fiber is for weight and I have several rolls.
My question is does anyone know how many layers of fiber it would take on the door to be equal to the walls???
The kiln walls will be 9 inches of soft brick.
Also should I spray the fiber with sodium silicate after the door is built??? Someone told me this would keep small particles of fiber out of the kiln.
Gene & Latonna
mudduck@mudduckpottery.com
www.mudduckpottery.com
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Hank Murrow on mon 4 jul 05
On Jul 4, 2005, at 1:46 PM, Gene Arnold wrote:
> I plan to start construction on a gas kiln soon and plan to use a
> fiber door. The reason I'm choosing to use fiber is for weight and I
> have several rolls.
>
> My question is does anyone know how many layers of fiber it would take
> on the door to be equal to the walls???
> The kiln walls will be 9 inches of soft brick.
Dear Gene;
Six inches of fiber will bring the surface temp down to around 235F.
Adequate indeed. I prefer to make folded modules in my installations.
Layering can lead to flue channels between layers, a no no.
>
> Also should I spray the fiber with sodium silicate after the door is
> built??? Someone told me this would keep small particles of fiber out
> of the kiln.
I would spray with ITC exactly as per ITC directions.
Cheers, Hank in Eugene just finishing a grand fireworks display.....the
good stuff.
www.murrow.biz/hank
Gene Arnold on mon 4 jul 05
I plan to start construction on a gas kiln soon and plan to use a fiber =
door. The reason I'm choosing to use fiber is for weight and I have =
several rolls.
My question is does anyone know how many layers of fiber it would take =
on the door to be equal to the walls???
The kiln walls will be 9 inches of soft brick.=20
Also should I spray the fiber with sodium silicate after the door is =
built??? Someone told me this would keep small particles of fiber out =
of the kiln.
Gene & Latonna
mudduck@mudduckpottery.com
www.mudduckpottery.com
Marcia Selsor on tue 5 jul 05
I used insblok, fiber board for structure and thn two layers of 2
inch fiber. I made buttons and attached through the materials into
expanded metal. I agree with Hank. Spray with ITC according to
directions. It stabilizes the nasty fibers.
Marcia Selsor
is perfect weather in Montana
William & Susan Schran User on tue 5 jul 05
On 7/4/05 4:46 PM, "Gene Arnold" wrote:
> My question is does anyone know how many layers of fiber it would take on the
> door to be equal to the walls???
> The kiln walls will be 9 inches of soft brick.
Others on this list with more experience working with fiber materials will
provide you with more detailed answers, but I would think instead of layers
of fiber blanket you might want to investigate insulating fiber block.
The following sites may be of interest - the first and industry article, the
second, a supplier of ceramic fiber boards.
http://www.ceramicindustry.com/CDA/ArticleInformation/coverstory/BNPCoverSto
ryItem/0,2708,71513,00.html
http://www.wardburner.com/ceramic.cfm
--
William "Bill" Schran
Fredericksburg, Virginia
Dean Poole on wed 6 jul 05
This is probably rumor but I once herd that one inch of fiber had the same
insulating properties as a brick. I have noticed that fiber kiln
manufacturers usually use six inches of fiber in walls. Common practice is
to accordion fold fiber. My door is six inches thick and seems to perform
quite nicely. I cut fiber for my door twelve inches wide and the length of
the door. It got folded it in half and impaled onto stainless rods. as a
side note Thermal Ceramics no longer produces fiber modules less than six
inches thick except by special order and they must have a good reason for
that. Hope this helps
Frank Colson on wed 6 jul 05
I find it amusing that all the answers on this subject of "how thick" to
make a ceramic fiber door never addresses the matter of heat loss and
retention to the ratio of thickness. For example: If a 1/2" blanket, rated
at 2600 degrees F, with a 300 degree loss (which is the case) ,from its
internal hot face, then how long would you want to be exposed to 300
degrees of radiant exposure outside the door?
If I build a portable raku kiln which I fire up to 1800 degrees in less than
one minuet, I use 1/2" blanket lining because my firing duration is
a big 15 minuets. If I have a 20 cu.ft. downdraft kiln., which I fire for
8 to 12 hours, I would go for 1" ceramic blanket. Knowing that ceramic
fiber is "reflective" and not "absorptive" of heat, a 1" thick door wall is
sufficient.
Don't forget that ceramic fiber suppliers are not manufactures. The only
downsize is that ceramic fibers, in any state, are easily destructed
if exposed to excessive abrasive action. Then, DO use 6" or more , simply
to have the freedom to knock or punch into the fiber face.. This will not
only give you the opportunity to be abusive but also allow you to pay
considerably more per square foot than necessary.
For the love of me I still do not understand why, in today's world, any
individually built kiln would have 9" thick walls? If taking that same
brick and simply turning it sideways, for a 4" wall, adding a 1/2" ceramic
fiber outside cover, would not only require fewer brick, make for a more
efficient and even firing kiln , but also be less expensive to build.
Frank Colson
www.R2D2u.com
----- Original Message -----
From: "Dean Poole"
To:
Sent: Wednesday, July 06, 2005 1:51 AM
Subject: Re: fiber door
> This is probably rumor but I once herd that one inch of fiber had the same
> insulating properties as a brick. I have noticed that fiber kiln
> manufacturers usually use six inches of fiber in walls. Common practice is
> to accordion fold fiber. My door is six inches thick and seems to perform
> quite nicely. I cut fiber for my door twelve inches wide and the length of
> the door. It got folded it in half and impaled onto stainless rods. as a
> side note Thermal Ceramics no longer produces fiber modules less than six
> inches thick except by special order and they must have a good reason for
> that. Hope this helps
>
>
____________________________________________________________________________
__
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
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