Microsilica 925T

Elkem Microsilica® 925T is a key ingredient in low and ultra-low cement castables. It is highly reactive during sintering, which leads to improved ceramic bonding at reduced firing temperatures. The grade is used in mortars, gunning mixes and other shaped and unshaped materials
Only for Asia and Oceanica


  • Improved flow – easier to cast
  • Improved particle packing - denser castables
  • Gelification (coagulation) in gunning mixes
  • Improved hot-strength properties 


  • Low and ultra-low cement castables
  • Castables, mortars, gunning mixes and other shaped and unshaped materials. 


The product is available in 500 kg big bags. Please contact us for more details. 

Storage conditions

Store in the original packaging (or re-seal opened packages) under dry conditions above 0°C. 

Chemical Analysis (weight %)
 SiO2  % min  92.0
 H20*  % max  1.5

Physical Data
 Loss on Ignition   % max  3.0
 Coarse particles >45µm  % max  2.0
 Bulk density * kg/m3 250-380

* When packed

Test methods

Test methods are available upon request