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Post by Karl L on Dec 17, 2017 0:27:03 GMT -8
I have some questions about materials used in the construction of the batch rocket or double shoebox stoves.
What specifications or brands of ceramic fibre board would be best? (For use in situations where high temperature, low strength, some rigidity, and insulation are required.)
Are these boards relatively 'safe' - i.e. non-carcinogenic (e.g. like Superwool: non-bio-persistent).
Also, another question:
When constructing from heavy or from insulating fire brick, what is the best mortar to use?
Is this different for a bell and a firebox?
Who are the best suppliers of these materials in the UK?
Thanks!
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Post by matthewwalker on Dec 17, 2017 6:53:42 GMT -8
I can answer two of those. Yes, they are safe. Mortar should be clay/sand.
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Post by Vortex on Dec 17, 2017 9:59:04 GMT -8
I have some questions about materials used in the construction of the batch rocket or double shoebox stoves. What specifications or brands of ceramic fibre board would be best? (For use in situations where high temperature, low strength, some rigidity, and insulation are required.) Are these boards relatively 'safe' - i.e. non-carcinogenic (e.g. like Superwool: non-bio-persistent). Also, another question: When constructing from heavy or from insulating fire brick, what is the best mortar to use? Is this different for a bell and a firebox? Who are the best suppliers of these materials in the UK? Thanks! Material safety data sheet for ceramic fiber products: www.ceramicfiber.net/MSDSCeraTex.pdfI only have experience of the Fiberfrax Duraboard brand of ceramic fiber board that's sold in the UK, I found it very delicate and almost impossible to handle without without knocking the corners and edges off. I got it from PotteryPro on ebay. No idea what the other brands are like. |
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Post by Karl L on Dec 17, 2017 11:42:01 GMT -8
I can answer two of those. Yes, they are safe. Mortar should be clay/sand. Thanks, Matthew. How do I get hold of, or make, clay/sand mortar? |
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Post by matthewwalker on Dec 17, 2017 12:29:24 GMT -8
Mix clay/sand 1:3 by dry volume.
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Post by coastalrocketeer on Dec 18, 2017 21:44:12 GMT -8
Karl, Brian K posted some industry/regulatory safety info about ceramic fiber products, and I commented with my feelings about how I feel about/approach the safety issues with it. In case you haven't seen it: donkey32.proboards.com/thread/2420 |
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Post by josephcrawley on Dec 19, 2017 7:53:31 GMT -8
You could try Larkin refractory for a east coast us source. or perhaps Harbison Walker another refractory dealer with many locations.
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Post by Karl L on Dec 19, 2017 10:22:09 GMT -8
Thanks, Joseph, but I was looking for sources in the UK :-)
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Post by Karl L on Dec 19, 2017 10:36:42 GMT -8
Mix clay/sand 1:3 by dry volume. Thanks, Matthew Do you start with dry clay powder? Just wondering how you mix it, otherwise. |
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Post by wiscojames on Dec 19, 2017 11:15:43 GMT -8
With most of us living in the US, it's unlikely you'll find a detailed rundown of suppliers like Matt did for us here. But I used the search terms "refractory supplier UK" and saw many results, most in central UK.
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Post by coastalrocketeer on Dec 19, 2017 12:30:14 GMT -8
Mix clay/sand 1:3 by dry volume. Thanks, Matthew Do you start with dry clay powder? Just wondering how you mix it, otherwise. You can start with dry clay powder, but if starting with wet clay, you do it more by feel than adding a specific amount of water... Someone may have a link to another discussion of clay-sand mortar... Or Matt may have some advice as to how to guage amounts of clay, sand, and water. |
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Post by Deleted on Dec 20, 2017 7:30:15 GMT -8
In the UK one can get Pulverised Fuel Ash (PFA) AKA Fly ash and other Pozzolans
including metakaolin at shops for traditional building materials, quite cheap.
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Post by Orange on Dec 20, 2017 23:34:41 GMT -8
Mix clay/sand 1:3 by dry volume. how about 1:1 ratio, isn't it stronger? |
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Post by pinhead on Dec 21, 2017 5:09:38 GMT -8
Mix clay/sand 1:3 by dry volume. how about 1:1 ratio, isn't it stronger? In my experience, if there's not enough sand the mixture will crack apart when it dries. It seems 1:3 clay:sand is a good standard mix. |
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Post by esbjornaneer on Dec 23, 2017 7:38:32 GMT -8
Karl L, it would be good to let us know where in the UK you want the source or do you want all locations? In Bristol there is Vitcas (https://shop.vitcas.com/ceramic-fibre-board-1260-vitcas-insulating-board-1.html these seem to be on offer at the moment) but if you are having it delivered you pay for a pallet delivery even of you are just getting one board! So if you will be in the south west you may be allowed to go there and pick up what you need saving yourself quite a chunk of money. As for clay/sand mortar the 3rd post in this thread (http://donkey32.proboards.com/thread/1068/dear-donkey-master-cob) is what helped me to get off the commercial fire cement.
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