Powder Kaolin Clay - Caco3, 2-5 Microns Particle Size, 2.71 G/cmâ³ Density | High Purity, Fine Particle Size, Whiteness, Versatile Filler

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.