There are three grades of MICA FLAKES which are normally used for specific purposes:
(1) Coarse Mica Flakes: Suitably used for sealing openings. Apparent density = 0.17kg/ltr. Particle Size : Max 10% retained on 9.50mm B.S.Sieve. Material retained on Sieve 4.75mm + material passed through 1.70 mm = 30-40% Max.
(2) Medium Mica Flakes : Generally used to combate mild circulation in porous formations. Apparent density=0.18 kg/ltr. Particle size: Max 10 % retained on 3.35 mm B.S.Sieve. Material retained on 1.70 mm + material passed through Sieve 0.425 mm = 30-40% Max.
(3) Fine Mica Flakes : Suitable for use when a sealing agent is needed to be small enough to pass through a shaker screen without interfering with the operations. Apparent density=0.20 kg/ltr. Particle size : Nil retained on 0.850 mm B.S.Sieve. Matertial retained on Sieve 0.425 mm + material passed through sieve 0.15 mm = 30-40% Max.
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Mineralogy Muscovite Mica
Appearance Flexible, non-adhesive, pearly silver flakes.
Specific Gravity 2.2 - 2.8
Density 270-320 Kg/m3 (0.17-0.20 gm3/cc)
pH (BS 3483) 7.5
Moisture @ 100oC Less than 0.25%
Water Solubility (BS 1775) Virtually insoluble
Reactivity Inert. No reaction with hydrocarbons, acids, brines and water
Oil Absorption (BS 1775) 60-75 gms/oil
Effect on Mud No adverse effect on properties and components of oil or water base muds.