Activated Clays are having multiple uses and application in various industries. Mainly it is used in bleaching / purifying of Vegetable Oils,Non-edible Oils, Mineral Oils, Pre & Post Treatment in Vanaspati, Margerines, Treatment of fatty raw materials in the manufacture of Waxes, Soaps, Paints, Petroleum Solvents, Re-refining of Wast Lubricants & Oils, White Oil, Transformer Oil and other basic Industrial Oils. Entire purpose is to remove phosphatides, gums, trace materials, fatty acids and other impurities and to produce the stable oil of acceptable colour.

Edible Oil Technical Oil
1 Sio2 55.65% 73.5% 68.7%
2 AI2O3 13.36% 13.5% 16.3%
3 Fe2O3 2.97% 1.8% 1.9%
4 MgO 3.75% 1.8% 2.4%
5 CaO 2.35% 1.4% 1.7%
6 Ignition Loss 18.92% 8.0% Max 9.0% Max
7 PH 8.3 to 9.0 5.5 to 7.0 7.5 to 8.0
(Depending upon the grade)
General Apperiance Free Flowing Powder
Colour Ash / Brownish Buff
Practical size passes through
          200 Mesh

Bulk Density 0.6 gm / cc
Bleaching Efficience

60 to 90% depending upon the kind and quality of the oils along with the dose of the Alkali given to the oils in the neutraliser. It also varies from oil to oil. The optimum dose should be decided by the actul user, as per the quality of Final oil required in each case.

Bleaching Efficiency:

In order to compare the bleaching efficiency of the CLASSIC grades against any of the Imported quality, the concentration should be equal to that of Imported quality. The bleaching efficiency will be equivalent with less retention of oil and fast filteration compared to any of the Imported cley. In order to compare with the running market grades of Indian Earths, the concentration of CLASSIC Earth shpuld be 50% by weight i.e. if you are using total 2% Earth and Carbon of Indian origin, you can get the same result with 1% CLASSIC Earth only.

Retention of Oil:

There will be considerable saving of oil in retention on two grounds. First, because of less dose, the retention will be naturally less. Secondly, because of special needle type oil repeling element in the CLASSIC clays, the percentage of oil retention is also less.

Acid Value:

While bleaching, CLASSIC Earth do not increase 'free acid' in the oils. Because of this particular element of the CLASSIC Earth, the chances of colour reversion in the bleacher or in de-odouriser are practically nil even at high temperature. Generally, the use of Activated Carbon can be safely avoided while using CLASSIC Earth e.g. it is better to use1% CLASSIC Earth insted of using. If actual user wishes to use Activated Carbon, that carbon should not contain " free Acid" this is important, otherwise, because of free acid in the Activated Carbon, the red reversion may develop after bleaching. It is recommended to avoide the use of cheap grades of Activated Carbon with CLASSIC Earth. This will also minimise the retention of oil in the spent, as Activated Carbon is having more percentage of oil retention than earth.

Rate of Filteration:

The particle size are adjusted in such a way that, while bleaching is going on, the particles of cley remain evenly distributed and remains fluffy in the oil, thereby avoiding settlement and the formation of caje will be stepwise in the filter press or other filter media. This particular aspect improves bleaching power and assures faster filteration.

Contact time in the Bleacher:

Generally the bleaching action is done so fast by each and every particle, that the contact time of 30 minutes will be quite sufficient. This is only recommendative as it also depends upon kind of oils, process equipments, colour setting in off seasons etc.


After due research, we have developed following Grades, thereby getting maximum efficiency with minimum does of our Earth.

GRADE : `L C' Suitable for Light Colour Oils / Expeller Oils.
GRADE : `D C' Suitable for Dark Coloured and Solvent Eatracted Oils.
GRADE : `R C' Suitable for Ricebran Oil
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