High temperature insulation.

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High temperature insulation.

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Hairyloon

Joined: 20 Nov 2008
Posts: 15461
Location: Today I are mostly being in Yorkshire.

Posted: Tue Jan 27, 15 3:03 am Post subject: High temperature insulation.
What's a good insulation to use for high temperature applications?

Mistress Rose

Joined: 21 Jul 2011
Posts: 16158

Posted: Tue Jan 27, 15 7:38 am Post subject:
Firebricks, fibreglass, or other inorganic material. How high a temperature are you talking about?

Hairyloon

Joined: 20 Nov 2008
Posts: 15461
Location: Today I are mostly being in Yorkshire.

Posted: Tue Jan 27, 15 9:26 am Post subject:
I think firebricks are more of a thermal mass than insulation, plus they are fairly difficult to bend to shape. How hot can you go with fibreglass? I suppose there is no reason why it can't go up to something near the meltin point of glass, which ought to be hot enough for most things.

vegplot

Joined: 19 Apr 2007
Posts: 21301
Location: Bethesda, Gwynedd

Posted: Tue Jan 27, 15 10:38 am Post subject:
Why not provide greater detail of what you're after want rather drip feeding information?

mousjoos

Joined: 05 Jun 2006
Posts: 1986
Location: VERY Sunny SW France

Posted: Tue Jan 27, 15 10:40 am Post subject:

vegplot wrote:

Why not provide greater detail of what you're after want rather drip feeding information?

it builds suspense....I'm on the edge of my seat !

Hairyloon

Joined: 20 Nov 2008
Posts: 15461
Location: Today I are mostly being in Yorkshire.

Posted: Tue Jan 27, 15 11:02 am Post subject:

mousjoos wrote:

vegplot wrote:

Why not provide greater detail of what you're after want rather drip feeding information?

it builds suspense....I'm on the edge of my seat !

See: engage the audience.

I have already mentioned pyrolytic decomposition in another thread, but there are other projects.
Besides, without close direction, the discussion may take an interesting turn...

NorthernMonkeyGirl

Joined: 10 Apr 2011
Posts: 4644
Location: Peeping over your shoulder

Posted: Tue Jan 27, 15 11:19 am Post subject:
Without knowing what you are insulating, I can only suggest asking a local crematorium what they use for heatproofing...

Woo

Joined: 19 Sep 2011
Posts: 787
Location: Mayenne, Pays de Loire

Posted: Tue Jan 27, 15 11:50 am Post subject:
Fibre glass. I wouldn't trust the extruded stuff. we had a fire in the genie house which we had insulated with the sheets of kingspan type stuff for sound proofing and it was a sticky mess! the wiring held out longer!

dpack

Joined: 02 Jul 2005
Posts: 46417
Location: yes

Posted: Tue Jan 27, 15 12:23 pm Post subject:

assuming keep the heat in rather than make the outside cool

fibre glass up to about 650 c,rockwool a little higher maybe 700c

above that you would be best off with a refractory lining and lots of heat as a lot of metals will start to soften ,react too much,degrade or just melt above that sort of temp

with a pyrolosis unit i would think either glass or rock would do

rockwool is less itchy and probably less damaging to lungs ,whichever if you are shaking and rolling so to speak rubber gloves and a dust mask are sensible

Hairyloon

Joined: 20 Nov 2008
Posts: 15461
Location: Today I are mostly being in Yorkshire.

Posted: Tue Jan 27, 15 7:26 pm Post subject:
Fibreglass also has the advantage that I have some left over from the loft.

gz

Joined: 23 Jan 2009
Posts: 9000
Location: Ayrshire, Scotland

Posted: Tue Jan 27, 15 10:27 pm Post subject:

HTI (high temperature insulation) bricks, made from China clay plus other stuff, used to build kilns....my kiln is made from these and I fired it regularly to1300 C I should say that the hot face of them could have been going to 1400plus.....yoou get different grades,next down you don't take over 1240 C

You can build kilns from ceramic fibre blanket, but it does get brittle after a few firings = dust =danger

All depends what you're doing to what temperature.

Hairyloon

Joined: 20 Nov 2008
Posts: 15461
Location: Today I are mostly being in Yorkshire.

Posted: Tue Jan 27, 15 11:24 pm Post subject:
A friend was talking to me about kilns recently. I'd mostly decided they would be fairly tricky to build... You may have just changed my mind.

Mistress Rose

Joined: 21 Jul 2011
Posts: 16158

Posted: Wed Jan 28, 15 7:19 am Post subject:

If you have enough mass, you won't need to insulate a pyrolytic decomposition burner too much. Our charcoal kiln is just a ring of steel, and we managed to get small amounts of wood tar out of a contraption built out of scrap iron and steel, including part of an old saw by the looks of things. Cooling the distillate will be the most important thing while checking the temperature so that the different fractions can be separated.

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