Cenosphere used to reduce weight in concrete, resins, plastics, ceramics, paints, and
coatings. Other benefits include increased filler loading, reduced shrinkage, lower
viscosity, fireproofing, lubricity, and transport savings. Higher Alumina cenospheres
have been developed for higher temperature applications such as refractory, foundries
and high temperature coatings and flame-retardants. Hollow ceramic microspheres are
used in many different industries and the number of applications continues to grow.
Cenospheres are an excellent lightweight filler for plastics and continue to grow in
popularity and use. Not only do they reduce the cost of the composite but Cenospheres
often impart performance improvements that might otherwise not have been achieved.
Cenospheres have been widely used in the construction industry for many years. From
roofing materials to stuccos and grouts, new applications and products continue to be
developed. The quantity of cenospheres used within the construction industry
continues to grow today as more and more companies realize the advantages cenospheres
bring to their products.
Cenospheres have been used in oilfield cementing for quite some time. During a
cementing job, cenospheres act to decrease the slurry density without increasing the
water content. This in turn provides better compressive strength to the cement.
PAINTS & COATINGS:
Cenospheres are special additives that both chemists and formulators in the paints
and coatings industry are using to enhance their products. A sphere has the lowest
surface area of any shape. As a result, these hollow ceramic microspheres reduce
resin demand and increase volume loading capacity.
Chemical composition (%):
SiO2 >55 Al2O3 >24 Fe2O3 <4 TiO2>1.1 MgO <1 CaO>2 K2O >1 loss <1
1) Particle size: 20 - 500 microns
2) Bulk density: 0.33 -0.46g/cm3
3) Color: light gray / offwhite
4) Moisture content: 0.5% max.
5) Floater: 95% min.