Originally posted by Alomran
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Be careful about sourcing fireclay from a pottery supplier as they recognise fire clay as a highly refractory clay capable of withstanding very high (porcelain:1300C+) temperatures not required for a WFO.
Fireclay from building suppliers is a different animal: basically the cheapest minimally refined clay available. It is better described as Bricklayers clay and is a better choice.
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