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Rubber products consume about 16% of the kaolin.

 

 

In paper-making, kaolin is utilized as a pulp filler as well as for coating.

 

 

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Kaolin is one of several types of clay, and is commonly referred to as China Clay or Paper Clay. It is a hydrated silica of alumina with a composition of approximately 46% SiO2; 40% Al2O3, and 14% H2O. It occurs in hexigonal plates, often in wormlike bunches. Geologically, kaolin comes from decomposition of feldspar in soft, disintegrating granite, gneiss, and porphyritic rocks—granite rich in soda-feldspar yielding it in greatest abundance.

Filling adds weight, opaqueness, and whiteness; coating gives high gloss. Some newspapers have a kaolin content of about 2%, while magazines with a relatively high gloss contain on the average of 30%. With the advent of high-speed coating equip-ment, the produc-tion of paper clays increased to the extent that it has nearly doubled in the past ten years., with a major portion of the remainder goinginto such products as linoleum, paints, inks, leather, refractories, and pottery

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