We are offering cenosphere. Cenospheres are unique free flowing powders composed of hard shelled, hollow, minutespheres. A small proportion of the pulverised fuel ash (pfa) produced from thecombustion of coal in power stations is formed as cenospheres. Cenospheres are madeup of silica, iron and alumina. Cenospheres have a size range from 1 to 500 micronswith an average compressive strength of 3000+ psi. Colors range from white to darkgray. They are also referred to as microspheres, hollow spheres, hollow ceramicmicrospheres, microballoons, or glass beads.