Cenospheres are unique free flowing powders composed of hard shelled, hollow, minute spheres. A small proportion of the pulverised fuel ash (PFA) produced from the combustion of coal in power stations is formed as cenospheres.
The main characteristics are:
•Hollow spheres with spherical morphology.
•Particle sizes ranging from 5 to 500μm in size.
•Ultra low density.
•Low thermal conductivity.
•High particle strength.
•Resistant to acids.
•Low water absorption
The main application in that of an inert filler. With a density lower than water (typically 0.6 – 0.8) cenospheres provide up to four times the bulking capacity of normal weight fillers.
Benefits:
A lower density compared to conventional fillers providing opportunities for weight reduction
Improved flow characteristics attributable to the spherical particle shape
Reduced shrinkage
Low oil (resin) absorption
Good chemical resistance
Increased hardness, scratch and abrasion resistance
Good thermal characteristics (lower specific heat capacity)
High compressive strength
100% recycled