MICA is made available in fine (F), medium (M) and coarse (C) grades.
MICA have been preferably used in water-based and oil based oil-well drillings operations as an additive mud chemical to prevent loss of circulation and seepage. Mica is specially added to seal-off the lost circulation zones. The platy structure of mica facilitates the overlapping of particles to form a layer or wall and acts as a sealant that bridges the openings. The use of mica helps to seal porous formations and contributes to regain circulation keeping the solids in suspension.
Property Typical Values
Physical Appearance Pearly Silver, Grey Flakes.
Specific Gravity 2.2 – 2.8
Solubility in Water Insoluble
Bulk Density 270 – 320 kg/m3
Product Grade Median Particle Size(micron)
Fine 400 – 850
Medium 850 – 1700
Coarse 1700 – 2400