Oven insulation for cheap?

Discussion in 'Hobby Engineering' started by Dodge M4S, Jul 14, 2019.

  1. Dodge M4S

    Dodge M4S Member

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    Sorry, not sure where to put this, but I need a lot of oven insulation for a powder coating oven im building and the cheapest I could find is $125 for a 7320mm x 610mm x 25mm roll. Anyone know if I can find a large roll like this for a bit cheaper in Perth? If I have to, ill just buy that roll but cheaper would be nicer.

    Ive been using the insulation from free ovens ive found (so far gutted 4) and ive only managed to insulate the top and one of the side so I think I need to speed up the process and just buy some insulation instead.
     
  2. aXis

    aXis Member

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    Any reason you cant use glass fibre or mineral fibre insulation batts? Earthwool & Rockwool are non combustible and should handle hotter temperatures than the steel you're using. The R rating is not great so specialised oven insulation *may* do better.
     
  3. OP
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    Dodge M4S

    Dodge M4S Member

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    Don't know if I can tbh. Im just trying to keep as much heat as I can trapped in as I don't want it to take forever to heat up what ever will be in there. Im only using the electronics of a standard house oven. The roll I'm planning on buying us a ceramic wool blanket that is used in pizza ovens.
     
  4. aXis

    aXis Member

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    If you aren't constrained too much by size, you could go with the glass/mineral wool and just go thicker.

    You could also consider vermiculite in board or granular form.

    Edit: apparently the R value of fibre insulation is pretty similar to the ceramic fibre refactory insulation, just it has a lower operating temperature. As long as you are running an oven and not a kiln/furnace then it should be OK.
     
    Last edited: Jul 15, 2019
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  5. OP
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    Dodge M4S

    Dodge M4S Member

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    I ended up buying Earthwool from Bunnings. It feels exactly like the stuff that was in the other ovens. Each bat is 195 x 430 x 1160mm and there's 18 of them lol so I think I should have enough. It was only $53 too. Thanks for the help :):thumbup:
     
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  6. xc351

    xc351 Member

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    be carefull. These may not burn easyily they will smoulder away releasing toxins. Its a common problem people building pizza ovens face. i eneded up buying some proper insulation from ebay wasn't cheap but goodness knows hpw those bats will handle 300c+ or what pesticides ect have been added
     
  7. OP
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    Dodge M4S

    Dodge M4S Member

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    It's not going to be used for food, ever. Only for powder coating. This stuff doesn't contain any chemicals (apparently) so it should be safe. The items inside the oven (Mainly rims and other car parts) will need to be heated up to 200 degrees and stay at that temp for around 20 minutes. Just reminded me, I need a new fire extinguisher.
     
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