#11  
Old 12-17-2010, 06:20 PM
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Location: Glendale, Arizona
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Default Re: Mineral Wool/RockWool

Hello All,

The mineral wool I got was in batts 4" thick. It was somewhat flexible but firm. I was able to split it into layers when I needed thin "sheets" and then saw full sized batts with a regular crosscut hand saw for odd shapes. One manufacturer packaged it in a bundle of four and another in a bundle of five. It is often used as fire block in buildings so it is sized for placement between studs. It is also used as a sound dampener.

Cheers,

Bob
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  #12  
Old 12-17-2010, 06:29 PM
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Thumbs up Re: Mineral Wool/RockWool

Quote:
Originally Posted by Storm Runner View Post
I was looking around and found that the R-Values of the fiberglass and the Rock Wool are about the same, with the Fiberglass being a bit higher per inch. 0.5 at most

The main difference between the two is the melting point with fiberglass melting at a considerably lower temp and ceramic having a much higher melting point.

Material Temperature
Glass wool 230 - 250 C (445-480 F)
Stone wool 700 - 850 C (1290-1560 F)
Ceramic fibre wool 1200 C (2190 F)
Important and timely information Storm Runner! Thanks for the leg work on this.

With a one inch ceramic layer over the dome, the rock wool would make a good filler instead of vermiculite then, right?

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Old 12-17-2010, 07:36 PM
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Default Re: Mineral Wool/RockWool

Mineral wool is the name in Europe for what we call fiberglass insulation, and it has the same problem: organic binders that burn and stink. Make sure what you buy is meant for refractory applications and will withstand 1000f temperatures.
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Old 12-18-2010, 06:27 AM
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Default Re: Mineral Wool/RockWool

The binders are the reason fiberglass insulation is a no-no, I personally have a hard time seeing that the actual glass would melt at the temps that we get on the outside of the dome but the binders used in fiberglass won’t add to love of the oven.

I don't know if stone wool ever has binders added, but I checked to verify that what I was getting didn't have them before I purchased and installed my boards. I haven't experienced any disappointment with the stone wool boards other than their limited flexibility.

I wrapped the boards into place and stuffed little bits into gaps and in the end I poured vermiculite into the enclosure and around the stone wool covering the dome and thus providing even more insulation.

As I have said elsewhere, the ceramic blanket is far superior when compared to the stone wool boards when tailoring the materials to the dome shape, but with just a bit of care the stone wool will do a very fine job of insulating. Stone wool is likley to be more available in many locations than is the ceramic blanket.

Chris

Last edited by SCChris; 12-18-2010 at 06:34 AM.
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Old 12-20-2010, 01:41 PM
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Thumbs up Re: Mineral Wool/RockWool

Found this quote in another thread, but its pertinant here:
Quote:
Originally Posted by BackyardPermaculture View Post
tfasz,

My oven is reasonably small and is not an igloo - it's enclosed. But my insulation worked out significantly cheaper than that:

- A 25 sq ft roll of insulation easily covered my dome/arch once, with enough to cover the top twice.
- Insulation is "Tombo" brand rockwool, made in Indonesia. It has an operating temp of 650c (1200F)
- 2" thick roll, so my dome top has 4 inches over it

The whole roll cost me about $50 from an industrial insulation guy - not sure if it's available where you are, but it works really well and was a great price.
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