Primary clays, melting points

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What is Primary clay?

Primary clays, melting points

Secondary clays can be broken down into: Ball Clay -- has some iron content; high content of organic matter (carbon); is more plastic; high shrinkage rate; melts around 2300o F (1260o C) Bentonite -- highly plastic; high volcanic ash content; good binding qualities Fire Clay -- has some iron content; melts around 2800o F (1400o C); varying organic content and plasticity Earthenware -- high iron and mineral content; naturally plastic; maturing range between 1700o F (926o C) - 2100o F (1150o C); Stoneware -- maturing range between 2,200o F (1205o C) - 2300o F (1260o C)



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