CENOSPHERE
A cenosphere is a lightweight, inert, hollow sphere comprised largely of silica and alumina and filled with air and/or gases. Cenospheres are a naturally occurring by-product of the burning process at coal-fired power plants, and they have most of the same properties as manufactured hollow-sphered products.

Typical Properties of Cenospheres
SiO2 52 - 62%
Al2O3 32 - 36%
K2O 1.2 - 3.2%
Fe2O3 1 - 2%
TiO2 0.8 - 1.3%
MgO 1 - 2.5%
Na20 0.2 - 0.6%
CAO 0.1 - 0.5%
Physical Properties
Specific Gravity(g/cc) 0.65 - 0.75
Bulk Density(Kg/M3) 350 - 450
Hardness(Moh's) 5 - 6
Compressive Strength(Kg/cm2) 180 - 280
Shape Spherical
Color Light Grey Light Buff
Melting Point 1350C
pH in water 6 - 7
Moisture 0.5% Max
Sinkers 3% Max
Oil Absorption 16-18 G/100G
What Are The Advantages of Using Cenospheres?
Manufacturing Benefits: The spherical shape of Cenospheres improves flowability in most applications and provides a more even distribution of the filler material. The natural properties of Cenospheres make it possible to use them either in dry or wet slurry form. Cenospheres are easy to handle and provide a low surface area-to-volume ratio. Due to their inert properties, they are not affected by solvents, water, acids, or alkalis. Cenospheres are 75% lighter than other minerals currently used as a filler or extender and are 30 percent lighter than most resins.

Lowered Cost: Utilization of Cenospheres reduces the cost of manufacturers' raw materials. The savings may be recognized in one or more of the following benefits:
Reduced Raw Materials
Cost Improved Flowability
Reduced Resin Demand
Improved Insulation Values
Resistant to Resin Absorption
Reduced End Product Weight