Rice Husk Ash
They manufacture organic amorphous silica (made of rice husk ash), for sale, with silica content of above 85%, in very small particle size of 25 microns, used for making better green concrete, high performance concrete, refractory, insulators, waterproofing chemicals, roofing shingles, specialty paints, flame retardants , carrier for pesticides, insecticides and bio fertilizers etc.