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Post by wiscojames on May 19, 2019 18:24:46 GMT -8
I am not recommending eating the stuff, but the question of safety has been raised. I appreciate the danger of breathing in the fibers, but I'm skeptical that consuming stray fibers would be particularly dangerous to one's health. For that matter, i wouldnt guess that using a 5 minute riser would produce much in the way of loose particulate. What say you?
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Post by Vortex on May 20, 2019 9:25:20 GMT -8
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Post by stefanvh on May 20, 2019 9:30:25 GMT -8
If the fibers can cause your skin to itch, I would think that it could also irritate/damage your intestines if you eat it. You would have to look up some papers which researched the effects, as guessing is quite useless (and possibly dangerous).
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Post by Deleted on May 21, 2019 6:28:15 GMT -8
The fibers can penetrate tissues and wandering around in the body.
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Post by wiscojames on May 21, 2019 7:03:45 GMT -8
Thanks, Trev, Stefan and Karl. As a preface, I'm not contradicting you or the conventional wisdom, but simply questioning.
Trev, in that material safety data sheet it says something like "unlikely entry pathway" for gastrointestinal effects, so nothing concerning from that source.
Karl, have you come across any citation for saying the fibers migrate through the intestines into other systems?
I plan to power an accumulating oven with a ceramic fiber blanket riser, so I think using it without an active fire should be alright, especially because I don't believe the fibers are being carried away during the course of the firing.
Mostly this thread was in the spirit of curiosity and "answers questioned".
Best, WJ
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Post by Deleted on May 21, 2019 7:36:32 GMT -8
Fibers have been found in kidneys, pancreas and liver of asbestos workmen, which is the only group with extensive examination. It is not clear if they entered over the lungs or the gut.
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Post by Vortex on May 22, 2019 4:50:56 GMT -8
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Post by drooster on May 23, 2019 14:16:15 GMT -8
I say treat the stuff as though it is absolutely deadly, as we are temporarily permitted (by gov't regs) to use it - go for it. Do not breathe or eat it : assume it is asbestos by another name.
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Post by matthewwalker on May 23, 2019 18:08:00 GMT -8
As you guys know, I'm of the mind it's not any more dangerous than the other materials we use in building these stoves. The other materials we use all have very similar warnings and classifications as ceramic fiber. Take a look at the Material Safety Data Sheet for firebrick, here: alsey.com/assets/pdf/msds/MSDS_FIREBRICK.pdf"Chronic Toxicity:Irritant to skin and mucous membranes. Carcinogenicity:Carcinogenic if inhaled" Compare that to the Ceratex ceramic fiber MSDS here: www.ceramicfiber.net/MSDSCeraTex.pdfAnd some CF board here: www.thermalsolutionsoftexas.com/pdfs/heat-trace/specifications/msds-ceramic-fiber-board.pdfThe second link states "Under sustained and steady high temperature over 1800, this material will possibly transform to crystalline silica(ciystobalite) in exposed portions." The same dangerous material that is a large part of most of our refractory materials. I don't believe that the CFB in a stove build poses any more risk than the fly ash from burning or the dust from fire brick or refractory. As for eating it, I don't worry about cooking downstream of the CFB cores. There is plenty of ash coating the sides of the cfb and I don't believe the fibers are getting in the gas stream in any significant amount. That's not to say these materials don't pose a danger, they do. They all do. Wear protective gear when building stoves out of anything, even natural mud. Try not to make dust, and if you make dust, don't breathe it. If you are worried about dust in the flue path, I have bad news for you...
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Post by Orange on May 30, 2019 20:51:21 GMT -8
CF blanket is like rockwoll so I guess particles can fly off with high gas velocity. CF board is more rigid, so there is less chance and firebrick is just heavy. I would coat it with mud/ash/cement www.youtube.com/watch?v=B309HWTd-GUor just bake in the firebox.
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