Wolkem India Ltd. Supplies Hydrophobic Hydrated Magnesium Silicate. Wolkem India Ltd. Is an ISO 14001:2004 registered company. Wolkem India Ltd. Convert the calcite, wollastonite, talc, dolomite and kaolin mined rocks into specialized grades based on varying purity, brightness, colour, particle sizes, particle shape and surface-treatments. Hydrophobic Hydrated Magnesium Silicate is a naturally occurring platy mineral which can be white, grey, green, pale green & grey white in colour and has a density of 2.75. Hydrophobic Hydrated Magnesium Silicate is widely used in paper, ceramic, paint, polymer, friction, adhesive, building material etc.