Cenosphere is inactive, lightweight, empty circle made generally of alumina and silica and are hollow ceramic microspheres found in fly ash a natural by-product of coal combustion during the generation of electric power which are loaded with air or dormant gas, which are used as fillers or functional extenders in the manufacturing of paints, plastics, lightweight aggregates for cement, resins; ceramics and other construction products. Since Cenospheres frequently substitute mined materials, they can considerably lower the cost of production. At the same time, cenosphere buyer can opt for cenosphere that can advantage complete product properties by growing the toughness and improved sound proofing. Cenosphere are Eco – friendly as materials are recycled from fly ash, and assist to conserve natural virgin fillers. Cenosphere are recycled from the waste stream as a portion of the fly ash generated in coal combustion. They are made up of iron, inert silica and alumina. Color of cenosphere ranges from dark gray to white. They are also referred to as microspheres, hollow spheres, micro balloons, hollow ceramic microspheres or glass beads.
Due to the spherical shape of cenosphere, which improves flow ability in most applications and provides a more even distribution of the filler material? The natural properties of cenosphere make it possible to use them either in dry or wet slurry form. Cenospheres are easy to handle that is the reason why Cenosphere buyer prefer it for its quality of providing low surface area-to-volume ratio. Due to their inert possessions, they are not exaggerated by solvents, water, acids, or alkalis. Cenospheres are 75% lighter than other raw materials currently used as a filler or extender. The properties are same as manufactured sphere products. Thus, it is also called as Glass beads. Due to their unique combination of low specific gravity, spherical shape, controlled size, many high value applications can be made.