Rice Husk 1. Its high silica content makes it useful for strengthening building materials 2. It resists fungal decomposition 3. It resists moisture penetration 4. It decomposes slowly 5. It insulates well 6. Itâ??s renewable It has been used as building material, fertilizer, insulation material, or fuel. Combustion of rice hulls produces rice husk ash (RHA) which is a potential source of amorphous reactive silica. Most of the ash is used in the production of Portland cement.
