Materials handbook.(Microspheres, Hollow-Silica Fume)

From: Ceramic Industry | Date: January 1, 2004 | Copyright information

MICROSPHERES, HOLLOW. Hollow microspheres are derived from the hollow fraction of fly-ash, and sometimes are also refered to as cenospheres. Typical compositions are 27-37 wt% aluninas and are 55-65 wt% silica, Cenospheres are a lightweight aggregate consisting of closed-cell, non-porous spheres. They have an average true density of between 0.6g-0.8/cc, an average bulk density of between 0.35-0.450/cc and a very low surface area to volume ratio. With an average crush strength of 2000 psi, systems with good strength-to-weight ratios can be achieved. Applications include insulating ...

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