The word Cenosphere is derived from two Greek words Kens (hollow) and Sphaira (sphere). Cenospheres are light weight, inert hollow sphere comprising largely of silica & alumina and filled with air or inert gas. Cenospheres are a naturally occurring by product of the burning process of pulverized coal-fired boilers. Cenospheres are formed from coal combustion ash when it is in a molten state. Flowing with the combustion gas stream, the temperature of the molten particles is rapidly quenched, thereby â€˜freezing inâ€™ a spherical shape. Cenospheres are unique free flowing powders composed of hard shelled, hollow, minute spheres. A small proportion of the pulverized fuel ash (PFA) produced from the combustion of coal in power stations is formed as Cenospheres. Cenospheres is versatile filler with applications in a wide variety of products, both commercial and industrial. These are as diverse as oil well cementing and PVC cushion vinyl flooring. However, in each case, Fillite is used for its unique properties, such as strength, low density and chemical resistance. Applications in Polyurethane: â€¢ Plywood Patching Compound â€¢ Synthetic Wood (Cast, Unfoamed) â€¢ Foam Carpet Backing â€¢ Electric Potting and Jointing Compounds â€¢ Tooling Blocks â€¢ Abrasive Wheels â€¢ De-Burring Chips â€¢ Pipe-Line Insulation Cenosphere are a by-product from coal ash. These hollow light weight spheres are produced around the world. Most all of the Cenosphere produced today are recovered from ash ponds or lagoons typically onsite at the coal fired power plant. Fly ash, or the residue from coal after combustion, has been a long-standing challenge for the Indian power sector, which is dominated by coal. Currently, 53 per cent of the total installed power capacity in the country is based on coal. Given that Indian coal has a very high ash content, in the range of 35 to 45 percent, the country currently generates approximately 160 million tones of fly ash, of which only 80 million tones is being utilized. Thus, cenosphere is a good project for entrepreneurs to invest.