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According to the manufacturer:
"Insulfrax calcium-magnesium-silicate fiber is recommended for continuous use at temperatures up to 1000?C (1832?F), and exhibits improved in-vitro solubility characteristics compared to Fiberfrax refractory ceramic fibers."
As described to me, it is a super-efficient, high heat insulator, with the advantage of being water soluable -- which is good from a health and environment persective. You should use a mask when using a product such as this, but it's better than traditional woven ceramic fiber insulation. It is an extruded, heat-resistant material that is woven into a blanket. It's the zillions (that's a technical term) of small air pockets that provide the high efficiency insulation.
I always remember that there are two reasons to insulate something. First to keep heat where you want it, and second to keep it away from where you don't want it. In the case of your brick oven, you want to aggressively insulate your oven dome to keep heat where you want it -- inside the dome and the oven chamber.
If you only wanted to keep heat from eaching the enclosure, you could encase your oven in 10" of concrete. You would rarely feel the heat of the oven in the enclosure, but you would loose all of the heat of the oven in the concrete -- your oven wouldn't cook.
Here are some simulated efficiency numbers we had thermal engineer run a while ago:
I had an insulation engineer run a test, and conclude that the blanket replaces 2" of loose vermiculite. We had them run a simulation where they added 1" of insulfrax, and reduced 1" of vermiculite. 1":4", 2":3", etc. over a 24 hour 1000F exposure. The outer face tested consistently dropped by adding 1" more insulfrax and 1" less vermiculite.
1" Insulfrax Blanket 6#, 4" Vermiculite 1000F** 172F
2" Insulfrax Blanket 6#, 3" Vermiculite 1000F** 161F
3" Insulfrax Blanket 6#, 2" Vermiculite 1000F** 151F
4" Insulfrax Blanket 6#, 1" Vermiculite 1000F** 142F
5" Insulfrax Blanket 6# ******* 1000F** 135F
So, you don't have to use Insulfrax, but I think it's a good idea.
You can find it on the Forno Bravo Store at:
http://fornobravo.com/store/product....cat=248&page=2
James
"Insulfrax calcium-magnesium-silicate fiber is recommended for continuous use at temperatures up to 1000?C (1832?F), and exhibits improved in-vitro solubility characteristics compared to Fiberfrax refractory ceramic fibers."
As described to me, it is a super-efficient, high heat insulator, with the advantage of being water soluable -- which is good from a health and environment persective. You should use a mask when using a product such as this, but it's better than traditional woven ceramic fiber insulation. It is an extruded, heat-resistant material that is woven into a blanket. It's the zillions (that's a technical term) of small air pockets that provide the high efficiency insulation.
I always remember that there are two reasons to insulate something. First to keep heat where you want it, and second to keep it away from where you don't want it. In the case of your brick oven, you want to aggressively insulate your oven dome to keep heat where you want it -- inside the dome and the oven chamber.
If you only wanted to keep heat from eaching the enclosure, you could encase your oven in 10" of concrete. You would rarely feel the heat of the oven in the enclosure, but you would loose all of the heat of the oven in the concrete -- your oven wouldn't cook.
Here are some simulated efficiency numbers we had thermal engineer run a while ago:
I had an insulation engineer run a test, and conclude that the blanket replaces 2" of loose vermiculite. We had them run a simulation where they added 1" of insulfrax, and reduced 1" of vermiculite. 1":4", 2":3", etc. over a 24 hour 1000F exposure. The outer face tested consistently dropped by adding 1" more insulfrax and 1" less vermiculite.
1" Insulfrax Blanket 6#, 4" Vermiculite 1000F** 172F
2" Insulfrax Blanket 6#, 3" Vermiculite 1000F** 161F
3" Insulfrax Blanket 6#, 2" Vermiculite 1000F** 151F
4" Insulfrax Blanket 6#, 1" Vermiculite 1000F** 142F
5" Insulfrax Blanket 6# ******* 1000F** 135F
So, you don't have to use Insulfrax, but I think it's a good idea.
You can find it on the Forno Bravo Store at:
http://fornobravo.com/store/product....cat=248&page=2
James
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