This kaolin in raw form has a brightness of over 90% and its mineral content is above 90%. PH of Kaolin in 20% solution is 7.665 and PH in 10% solution is 7.25. Its maximum melting temperature is 1550 degrees Celsius and the cooking shrinkage on the basis of raw (wet) is 9.7 percent. In terms of plasticity and quality of Qalandarkuh and Nader ...
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