About This Project
Cenospheres | PMS

Cenospheres or Microspheres



Cenospheres are formed in coal fired power stations. After burning of the coal, the resulting pulverized fuel ash (PFA) is removed in the form of a slurry into lagoons, where most of the ash particles settle out. Only a very small portion floats to the surface and these particles are minute hollow spheres known as cenospheres or microspheres.
A cenosphere is a light weight, inert, hollow sphere made largely of silica and alumina and has a typical size between 5 and 500 microns. Its colour varies from grey to almost white.


Applications and markets

The main benefits of cenospheres are: reduction of weight, shrinkage, viscosity and an increase of  fireproofing, sound dampening and refractoriness. Its applications are for example:

    • in lightweight insulating (refractory) products
    • in paints, lacquers, coatings, plastics and adhesives
    • in light weight aggregates like special concretes



Plomp Mineral Services is able to supply microspheres based on specific gravity, size distribution, colour, chemistry, or a combination of these criteria to meet your specific needs.
Various grades of white and/or off-white microspheres can be offered with the below typical specification:

    • Chemical:  Al2O3  typical 30 – 40 %  |  SiO2  typical 50 – 60 %
    • Various Sizings:  0 – 90 micron | 0 –  200 micron | 0 –  300 micron
    • Various Specific density:  ranging from 0.6 to 0.9 g/cm3
    • Various Colour:  from white to off-white to light grey

Technical Data Sheets (TDS) and Safety Data Sheet (SDS) will be sent on request.
Plomp Mineral Services has registered all uses and applications for this substance and is therefore fully REACH compliant.



We supply our Cenospheres in paper bags and big bags and can deliver by truck, container and rail from our stocks.

Are you interested in our Cenospheres? Please feel free to contact us!