digplanet beta 1: Athena
Share digplanet:


Applied sciences






















A cenosphere is a lightweight, inert, hollow sphere made largely of silica and alumina and filled with air or inert gas, typically produced as a byproduct of coal combustion at thermal power plants. The color of cenospheres varies from gray to almost white and their density is about 0.4–0.8 g/cm3 (0.014–0.029 lb/cu in), which gives them a great buoyancy. Cf. glass microspheres.

Cenospheres are hard and rigid, light, waterproof, innoxious[citation needed], and insulative. This makes them highly useful in a variety of products, notably fillers. Cenospheres are now used as fillers in cement to produce low-density concrete[citation needed]. Recently, some manufacturers have begun filling metals and polymers with cenospheres to make lightweight composite materials with higher strength than other types of foam materials[citation needed]. Such composite materials are called syntactic foam. Aluminum-based syntactic foams are finding applications in the automotive sector.[citation needed]

Silver-coated cenospheres are used in conductive coatings, tiles and fabrics. Another use is in conductive paints for antistatic coatings and electromagnetic shielding.[1]


The word cenosphere is derived from two Greek words kenos (hollow, void) and sphaera (sphere), literally meaning "hollow spheres".


The process of burning coal in thermal power plants produces fly ash containing ceramic particles made largely of alumina and silica. They are produced at temperatures of 1,500 to 1,750 °C (2,730 to 3,180 °F) through complicated chemical and physical transformation. Their chemical composition and structure varies considerably depending on the composition of coal that generated them.

The ceramic particles in fly ash have three types of structures. The first type of particles are solid and are called precipitator. The second type of particles are hollow and are called cenospheres. The third type of particles are called plerospheres, which are hollow particles of large diameter filled with smaller size precipitator and cenospheres.

Fuel or oil cenospheres[edit]

The definition of cenosphere has changed over the last 30 years. Up until the 1990s it was limited to a largely carbonaceous sphere caused by the oxygen-deficient combustion of a liquid fuel droplet that was cooled below 200 °C (392 °F) before it was consumed. These fuel cenospheres indicated a combustion source using injected droplets of fuel or the open burning of heavy liquid fuels such as asphalt or a thermoplastic material that were bubbling as they burned; the bursting of the bubbles created airborne droplets of fuel.[2][3] This is still a common definition used in environmental microscopy to differentiate between the inefficient combustion of liquid fuels and the high temperature fly ash resulting from the efficient combustion of fuels with inorganic contaminants. Fuel cenospheres are always black.[4]

The refractory cenosphere as defined above is synonymous with microballoons or glass microspheres and excludes the traditional fuel cenospheres definition.[5] The use of the term cenosphere in place of microballoons is widespread, and it has become an additional definition.

See also[edit]


  1. ^ "About our Products: Silver Coated Cenospheres". Camouflage.com.au. Retrieved 29 May 2013. 
  2. ^ McCrone, Walter C.; Draftz, Ronald G.; Delly, John Gustav (1967). The Particle Atlas. Ann Arbor Science Publishers. p. 349. 
  3. ^ Hopke, Philip K. (1985). Receptor Modeling in Environmental Chemistry. Wiley-Interscience. pp. 43–44. 
  4. ^ "Cenospheres from Diesel Fuel". Microlabgallery.com. Retrieved 29 May 2013. 
  5. ^ Brady, George S.; Clauser, Henry R., eds. (1979). Materials Handbook (Eleventh ed.). McGraw-Hill. p. 490. 

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Cenosphere — Please support Wikipedia.
This page uses Creative Commons Licensed content from Wikipedia. A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia.

135 news items

PR Newswire (press release)
Fri, 15 Apr 2016 09:52:30 -0700

According to the new Market Research Report "North America Cenosphere Market: By Applications (Paints & Coatings, Automotive, Oil & Gas, Construction, Refractory and Others); By Country (U.S., Canada, and Rest of North America) - Forecasts till 2021", ...
Wed, 27 Apr 2016 13:48:45 -0700

Report analyzes North America Cenosphere market with respect to market drivers, opportunities, and trends in different regions. Cenosphere is a lightweight, inert, hollow sphere made largely of silica and alumina and filled with air or inert gas ...
Business Wire (press release)
Mon, 18 Jan 2016 10:47:32 -0800

In this report, the North American cenosphere market has been broadly classified on the basis of application and geography. The application segment is divided into paints & coatings, automotive, oil & gas, construction, refractory, and others. On the ...
PR Newswire (press release)
Fri, 04 Dec 2015 07:33:15 -0800

According to a Market Research Report "North America Cenosphere Market, By Geography (U.S., Canada, Rest of North America); By Application (Paints & Coatings, Automotive, Oil & Gas, Construction, Refractory, Others) - Forecasts till 2019", the North ...
Business Wire (press release)
Mon, 25 Jan 2016 08:18:33 -0800

The global cenosphere market is projected to be worth $572.0 Million by 2020, growing at a CAGR of 12.3% between 2015 and 2020. This high growth of the market is attributed to the increasing demand of cenospheres from end-use industries in the U.S ...
PR Newswire (press release)
Fri, 23 Jan 2015 15:00:38 -0800

The Global Cenosphere Industry Report 2015 is a professional and in-depth study on the current state of the cenosphere industry. The report provides a basic overview of the industry including definitions, classifications, applications and industry ...
Wed, 20 Jan 2016 03:26:15 -0800

Currently, the global Cenospheres Market is dominated by various market players such as Petra India Products (India), Cenosphere India Pvt. Ltd. (India), Durgesh Merchandise Pvt. Ltd. (India), Omya AG (Switzerland), Qingdao Eastchem Inc. (China), ...
PR Newswire (press release)
Thu, 25 Feb 2016 08:46:36 -0800

According to the new Market Research Report "Global Extracorporeal Membrane Oxygenation (ECMO) System Market: By Modality (Veno Artrial (VA), Veno Venous (VV), Artrio Venous (ECOO2 R)), By Application (Respiratory, Cardiac, ECPR), By Geography ...

Oops, we seem to be having trouble contacting Twitter

Support Wikipedia

A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia. Please add your support for Wikipedia!

Searchlight Group

Digplanet also receives support from Searchlight Group. Visit Searchlight