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  
Physical Properties
 

Appearance	Grey white hollow sphere
Specific Gravity	0.6-0.80G/CM3
Bulk Density	0.3-0.45G/CM3
PH in water	6-7
Hardness	6-7
Melting Point	>1400℃
Float Ratio	93-95%	70-75%
Oil Absorption	16-18 G/100G
Moisture	0.5%Max

 
CHEMICAL ANALYSIS:
SiO2                 50-60%
AL2O3              33-39%
Fe2O3              1.3-5%
CaO                  0.5-4%
MgO                  0.8-1.5%
Na2O                0.2-0.6%
K2O                  0.5-1.1%
SO3                  0.1-0.2%
 
Particle Sizes
10-650 um,Or we can make the sizes as customers’requirements.
Storage and package
Stored in cool,dry and ventilated place.
25KG craft paper bag lined with pp bag.