Microsphere (Cenosphere)

Microsphere (Cenosphere) – small balls that are formed in the composition of fly ash during the combustion of coal at thermal power plants, district power plants. During the combustion of finely ground coal particles, impurities of aluminum oxide, silicon and other
elements present in natural coal form complex silicates at high temperatures, which take on a spherical shape in the molten state.

Due to the gases dissolved in the silicates, spherical microdroplets of molten silicates are blown into the smallest bubbles – microspheres.

Chemical composition and physical characteristics

Chemical composition, %
SiO254,63-58,22
Al2O326,75-33,16
Fe2O32,57-6,55
К2О2,73-5,54
P2O50,18-0,43
CaO0,68-1,27
TiO21,18-1,41
Granulometric composition, type 0-200
Sieve, microns%
425 – 5000.00
300 – 4250.00
212 – 3000.90-4.90
150 – 21217.52-31.48
106 – 15030.82-45.04
75 – 10615.28-24.96
53 – 757.20-13.68
< 533.98-10.86
Granulometric composition, type 0-500
Sieve, microns%
425 – 5000.70-2.00
300 – 4257.00-17.00
212 – 30032.88-49.42
150 – 21223.24-31.00
106 – 1505.60-18.16
75 – 1062.00-6.48
53 – 752.04-0.80
< 531.52-0.12
  • Humidity, % — < 0.5
  • Bulk density, g/cm 3 — 0.38 – 0.41
  • Buoyancy, % — >95
  • Color – gray, light gray, light brown

Fields of application: The combination of unique properties of microspheres — low density, small size, spherical shape, high hardness and melting point, chemical inertness — determines the widest range of applications of microspheres in modern industry.

  • Construction: ultra-light concretes, lime mortars, liquid mortars, cements, plaster, coatings, roofing and soundproofing materials, paint, protective coatings, decorative materials.
  • Oil industry: sealing materials for oil wells, drilling fluids, crushing materials, explosives.
  • Ceramics: refractory materials, refractory bricks, coatings, insulating materials, refractory coatings.
  • Plastids: nylon, polyethylene, polypropylene, and other materials of various densities.

Transportation conditions: Transport by road or rail in big bags

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Trade names:

🇬🇧 English: Cenosphere, Microsphere, Fly Ash Microsphere, Hollow Ceramic Microballoon.

🇩🇪 Deutsch: Cenosphäre, Mikrohohlkugel, Mikroballon (Glashohlkugel)

🇮🇹 Italiano: Cenosfera, Microsfera di cenere volante, Microglobulo ceramico cavo

🇷🇴 Română: Cenosferă, Microsferă din cenușă zburătoare, Microbaloane ceramice goale