| During
manufacture, stringent control is exercised on following properties
of Refoil Bleaching Earth. |
 |
Bleaching Activity : A
hard to bleach oil, with known ffa and color is treated with
various dosages of Refoil Earth under standard vacuum, temperature,
contact time and stirring. The colors are measured in Lovibond
Tintometer and the results are compared with standard earth
results. |
|
Acidic property : Measurement
of residual free acid content as well as pH value of water
solution filtered out of the Bleaching Earth are routine test
with titration method as well as pH meter and stringent standards
are maintained for the same. |
|
Water content : Moisture
content is measured in a standard laboratory drying chamber
as well as by Karl-Fisher- titrations. |
|
Particle - size distribution :
It is checked on standard sieves by careful air stream sieving
as well as on particle size analyser. |
|
Filtration property :
We have a standard, exhaustive, test method for determining
the filteration properties of our bleaching earth. We filter
oil under standard conditions of temperature and pressure
difference over an oil-wet-filter-cake. Stringent standards
are followed and maintained to ensure fast filtration rate
of Refoil Earth. |
|
Oil Retention : This is
a supplementary test carried out in conjunction with filtration
test. It depends on activation and particle size of Bleaching
Earth and is maintained at the minimum levels. |
