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Is Found-clay ok for a poured J-tube??

 
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Do i have to use store-bought fire-clay when pouring a J-tube burn-core, or can i use my left-over cob clay i dug myself in the pour mix with perilite and furnace cement??
 
pollinator
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Probably not, regarding the use of found clay. Most clays will not be able to take the temperatures that are likely. Cracking will almost always occur. I've done some pottery. A huge amount of experimentation is required in order to discover the properties of a given resource. It's not worth it unless many units are produced.
 
michael valdez
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Thanks Dale,
Sorry about the two part question.
So when you said probably not, did you mean no, i probably don't have to use store-bought fire-clay, or no, i probably shouldn't use my left over, dug - myself, cob clay??
 
Dale Hodgins
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I came back and edited while you were typing. Your topic title was different than the one below. It all makes sense now.
 
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