Kaolin or china clay is a natural mineral found in partly decompo-sed granite, an igneous feldsparic rock. Chemically, kaolin is a hydrated aluminium silicate containing Al2O3.2SiO2.2H2O. It is one of the most abundantly available clay in the Earth's crust. It is a soft, earthy, usually white to off white and sometimes reddish in colour, produced by the chemical weathering of aluminium silicate minerals like feldspar.
Form :
Appearance :
Moisture Content (Dried at 110 Deg C) :
Fluidity (Viscosity/100ml.)
Plasticity
Bending Strength
Shrinkage
Refractoriness :
Porosity (SK-9) :
Lump/Noodles/Powder
a) Before Firing : White/Off-White
b) After Firing (SK-9) : White/Whitish
10% max
At 50% consistency using maximum 0.2% defloculant
(Sodium Silicate), the flow through 0.42 orifice)
a) Time (Sec.) : 7 max
b) Casting Rate : 5-8 mm/30 min
Good
(Specimen to be prepared by Extrusion Method)
a) Green (Dried at 100 Deg C) : 15kg/cm2 min
b) Fired at SK-9 (1280 Deg C) : 200 kg/cm2 min
a) Green (Drying at 110 Deg C) : 4-6%
b) Fired Shrinkage (at SK-9) : 8-10%
c) Total Shrinkage : 12 -15%
SK-35/36 (1770 - 1790 Deg C)
12% max
B) Chemical Properties :
Loss of Ignition : 13.5% max
SiO : 50% max
Al2O3 : 34% min
Fe2O3 + TiO2 : 1.5% max
CaO : 0.8% max
MgO : 0.5% max
KNaO : 1.5% max
Industrial Applications :
China Clay is the heart of several industries like potteries, tiles, ceramics, glass and others.
1. Paints
2. Paper
3. Plastic
4. Electrical Industry
5. Cosmetic & Soap
:
China Clay is used in wide varieties of paints like distemper, cement primer, wood primer, emulsion paint, texture coating, spray plaster, putties, fillers and undercoats.
:
It is used in varieties of papers, cardboards, hard boards and others.
:
It is used as a filler in combination with others to impart strength and smoothness.
:
It is used for electrical insulation, high voltage insulation compounds electrical wires, EPDN rubberand others.
:
China Clay is used in toothpaste, cosmetic and soap industry.
H.S.CODE NO.
Kaolin and other kaolinic clays wheather or not calcined
Kaolin and other kaolinic clays wheather or not calcined
