New oven build: Input is appreciated :)

[RiverdaleRods]

Hello everyone. I have been lurking and reading for awhile now, but have officially started my oven build. Oven will be 4X4X6 lay down, but will have two doors on the side with an insertable divider allowing you to use half at a time if you wish. I have purchased 5 -2600 watt elements for a total of 13000 watts. Also have purchased all Auber products for PID and K type thermo with two 40 amp SSR's. Structure is made out of square rectangular tubing, and insulation will be kiln quality calcium silicate.

Only real question at this point is if it is ok to line my interior with aluminum. The calcium silicate will be ridgid---almost mortar like(stacked bricks with sealant in between), so there will be no transfer to the outside of the oven. I am planning on using sheets of.010 aluminum merely for a dust barrier from the calcium silicate. Should I try to attach the aluminum in a million places, or try to not attach it except on the outer edges(for expansion) . I realize aluminum is more expensive, but i currently have in storage 6 sheets of 4 by 12 .010 aircraft aluminum, so no money will be put in to that part.

Am anxious to hear everyone's input, and hope to get a lot out of this forum as well as hope to help others. Thanks Guys!!!

[baz]

Hello everyone. I have been lurking and reading for awhile now, but have officially started my oven build. Oven will be 4X4X6 lay down, but will have two doors on the side with an insertable divider allowing you to use half at a time if you wish. I have purchased 5 -2600 watt elements for a total of 13000 watts. Also have purchased all Auber products for PID and K type thermo with two 40 amp SSR's. Structure is made out of square rectangular tubing, and insulation will be kiln quality calcium silicate.

Only real question at this point is if it is ok to line my interior with aluminum. The calcium silicate will be ridgid---almost mortar like(stacked bricks with sealant in between), so there will be no transfer to the outside of the oven. I am planning on using sheets of.010 aluminum merely for a dust barrier from the calcium silicate. Should I try to attach the aluminum in a million places, or try to not attach it except on the outer edges(for expansion) . I realize aluminum is more expensive, but i currently have in storage 6 sheets of 4 by 12 .010 aircraft aluminum, so no money will be put in to that part.

Am anxious to hear everyone's input, and hope to get a lot out of this forum as well as hope to help others. Thanks Guys!!!

is there a reason for the calcium silicate ? price?
is it possible that they might take longer to get up to temp ?

[planebuilder]

I used aluminum with no problem.
I would however question your insulation. It's great for the high temp of a kiln, but you want less density, less thermal mass. You will spend more time and $ heating it up than if you used a lighter insulation.
IMHO

[RiverdaleRods]

thanks for the input so far. the calcium silicate is like a powdered block. i purchased about $13000 dollars of it for $137 at a local auction. I figure with a thermal k value of .73 btu, it would work pretty good. i may of worded it wrong when i said mortar like. its not like brick or anything, just meant i would be stacking the blocks that way. has anyone here had experience with the calcium silicate?? again, thanks everyone for your valuable help!!

[RiverdaleRods]

Here is the info from mcmaster's web site.


Rigid Calcium Silicate Insulation
Made of calcium silicate, these sheets are designed for high heat conditions and are ideal for oven and furnace walls. They can be used indoors as well as outdoors if protected from the weather.
High-Temperature Sheets

* Temp. Range: Max. 1200° F; low end not rated
* Heat Flow Rate (K-factor): 0.73 Btu/hr. x in./sq. ft. @ 800° F
* Density: 14.5 lbs./cu. ft.
* Color: Gold

Cut with a handsaw. Install using metal banding (not included; see page 3461). Meet ASTM E84 0/0 for flame and smoke. Package quantity is two.

[alansrt4]

thanks for the input so far. the calcium silicate is like a powdered block. i purchased about $13000 dollars of it for $137 at a local auction. I figure with a thermal k value of .73 btu, it would work pretty good. i may of worded it wrong when i said mortar like. its not like brick or anything, just meant i would be stacking the blocks that way. has anyone here had experience with the calcium silicate?? again, thanks everyone for your valuable help!!

Heck with a deal like that I would almost say sell it off make a good bit of profit and use something more common and shown to work on here