semi densified microsilica . bulk density below 300kg/m3 Materials used in refractory widely,has high fluidity SiO2 95%min Microsilica , it's a byproduct of producing silicon metal or ferrosilicon alloys. Silicon metal and alloys are produced in electric furnaces. The raw materials are quartz, coal, and woodchips etc..Silica fume consists primarily of amorphous (non-crystalline) silicon dioxideMicrosilica can be used in a variety of cementation products, such as concrete, grouts, and mortars as well as elastomeric, polymer, refractory, ceramic and rubber applications.

Semi bulk density Microsilica