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Matrikote 90

 
pollinator
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Anyone used this?  I'm thinking that it might be useful to protect ceramic wool blanket inside the burn chamber rather than using fire bricks which take up volume.

This is the first video on youtube I can find on this stuff.

 
pollinator
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The product I can get needs 800c to cure but I have not actually read any reports about how successful the product is.
However ceramic board is readily available and that is what a lot of people are now using.
 
Graham Chiu
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Ceramic board is pretty fragile too.
 
Fox James
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Yes quite vulnerable although it toughens up with heat, you can use the same product to harden the board too.
I have a blanket riser in my stove.
 
Graham Chiu
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I think people are considering using rigidizers on wool in the riser to seal the blanket and stop aluminum silicate fibers from being blown into the air that you are breathing.  However, we don't have data yet to suggest that these fibers are carcinogenic like asbestos.  However, I'm looking to harden the wool against wood abrading it whereas in a riser, that shouldn't happen.
 
Fox James
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I can only find a few snippets of info regarding how well it works but my refactory supplier (I build pizza ovens) told me it works quite well when applied to ceramic board and fired to over 800c.
I doubt if the product would harden supercool to withstand the feed box but I don’t really know.
My own feed box is made from 28mm cast refactory and surrounded  with 100mm of vermiculite cement mix, the whole system takes about one hours to max out but heats the cooking plate to around 220c in 15 mins.
I hope you get to try it out as there are plenty of people waiting for results......
 
Graham Chiu
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I emailed the vendor several times asking for shipping weights and dimensions which he declined to give since he's had so many sales fall through for foreign customers!

In the end I just ordered from Amazon with a US shipping address which will then forward to me.  I'm reluctant to use ceramic blanket without a rigidizer at present as although it may be fine inside a bell and then vented out a chimney, my use is in a black oven, and I don't want to be exposed chronically to air borne ceramic fibres which likely have biological persistence in the lungs.  Although there's no current hard evidence it causes cancer like asbestos, it could cause lung inflammation.
 
Graham Chiu
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And for those interested, the dimensions are: Weight 1 kg, dimensions 26 x 19 x 13 cm, and volumetric weight 1.28 kg.

The review on Amazon says heat times are down by nearly half on raw ceramic fiber, and he's able to get steel bright orange-white without problems.
 
pollinator
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I' just ordered some water glass to use as a rigidizer, then found out there are utube vids explaining how to make it from lye (drain unclogger )  and silica gel (I have lots of that already on hand.

 If it helps at all, I just dismantled a heat riser which I used ceramic fiber (unrigidized)  and the fibers still look very pristine after one season of use.

I   use    fire brick splits if there is wood abrading- especially for the floor and sides of the firebox, and especially if it is to be a permanent install., then perlite clay mix to hold it all together and give some extra insulation.  I'll use the rigidized fiber blanket for the ceiling of the batch box.

doing some searches today I came up with this thread which talks about several other approaches. Which may give a harder face than simple rigidizer if you do plan to use it in the fire box   https://www.iforgeiron.com/topic/37246-homemade-rigidizer/
 
Fox James
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Thanks Bob, some interesting info on that link ....
It seems there might be some issues with matrikote withstanding very high temratures?
 
bob day
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Remember those guys are into forges, which can go way beyond the temps rocket stoves and batch burners play with.  I think 1500 (F) is a nice high end mid range for us, while they run to 3000 (and beyond)
 
Fox James
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Hopefully Graham will test it out for us......
 
Graham Chiu
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Fox James wrote:Hopefully Graham will test it out for us......



It's been sitting at my USA shipping agent for another parcel to arrive so I can amalgamate the items but it turns out there was no saving to be made that way!
Anyway, it's on its way to me now .. maybe 9+ days to reach me.
 
bob day
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After you're done testing that, I just saw some stuff on another forge link, satanite.  webpage
 
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Was there an outcome from this  in the end?
 
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bob day wrote:I' just ordered some water glass to use as a rigidizer, then found out there are utube vids explaining how to make it from lye (drain unclogger )  and silica gel (I have lots of that already on hand.

 If it helps at all, I just dismantled a heat riser which I used ceramic fiber (unrigidized)  and the fibers still look very pristine after one season of use.

I   use    fire brick splits if there is wood abrading- especially for the floor and sides of the firebox, and especially if it is to be a permanent install., then perlite clay mix to hold it all together and give some extra insulation.  I'll use the rigidized fiber blanket for the ceiling of the batch box.

doing some searches today I came up with this thread which talks about several other approaches. Which may give a harder face than simple rigidizer if you do plan to use it in the fire box   https://www.iforgeiron.com/topic/37246-homemade-rigidizer/


It is cheaper to buy the water glass than to make it yourself from household items.
 
bob day
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A lot has changed since I wrote that post, and I'm currently getting ready to try some geopolymer experiments which could possibly take the place of firebricks and insulation and ceramic fiber .

I still have a love affair with plain old clay, and my current DSR style batchbox has lots of firebricks combined with a perlite clay mix,  but I'll soon be looking at casting a DSR 2  core with a geopolymer (think refractory cement but cheaper).

I will likely still be using clay and perlite to support and hold everything together, it's just too easy and too forgiving not to have as much fun with it as possible.  The clay I'm working with today is recycled from the first RMH I ever built 5 or 6 years ago. I did bring in some regular bricks for the exterior of the bell etc, but they are held together with sifted clay as the mortar.  :-)

And you're right, if you don't have the stuff lying around, buying the waterglass ready made is a better deal.
 
Graham Chiu
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I've been far too busy to experiment so the Matrikote I bought remains in its bag.  Maybe in my summer which is now I'll get a chance to play,
 
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