Hollow microsphere are light are light gray or off-white, light, inert and nonmetallic hollow ceramic spheres in the range from 10µm to 850µm.With N2 or CO2 inside and over 95% spheres, the material has excellent fluidity as well as sound electric and heat insulation, Hence it is called” The Space Era Material”. The hollow micro-spheres can be further divided into two kinds: Thin Wall Hollow Ceramic Micro-sphere and Thick Wall Hollow Ceramic Micro-sphere.
From:cnglassbead.com
