Microfume 106 UM is an Undensified Silica fume that improves the mechanical properties (compressive strength) and durability (via permeability decrease). Microfume 106 UM can be used as an extender for lightweight cements and a compressivestrength enhancer for low-temperature, lightweight cements. Microfume 106 offers a lower water content and improved flowability with a higher PAI (Pozzolonic Activity Index) for improved compressive strength development for light weight slurries.