Powder Kaolin Clay

These Powder Kaolin Clay 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 worm like bunches. Geologically, kaolin comes from decomposition of feldspar in soft, disintegrating granite, gneiss, and porphyritic rocksa 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 equipment, the production of paper clays increased to the extent that it has nearly doubled in the past ten years, with a major portion of the reminder going into such products as linoleum, paints, inks, leather, refractories, and pottery.