The best-known property of bleaching earth is its high adsorption capacity, which can be further enhanced with acid treatment. The resultant increases in pore volume and its surface area enhance the above parameters - giving the bleaching earth a high adsorption capacity for phosphatides, colouring pigments, and trace metal impurities. 

The catalytic properties of the clay are responsible for the destruction of peroxides, which increases the oxidation stability of the refined oil.

The particle size distribution is of crucial importance as poor granulation can lead to poor filtration rates and under-performance of the bleaching process.

Thus, it is essential to have tight control over the particle size distribution in order to optimise overall bleaching efficiency. It is important to note that different oils and fats may require different bleaching earth characteristics. As such, W Clay has opted to provide optimised particle size distribution for its clients. 

Our pure "Homogeneous Fullers Earth", which is of premium grade, will be tested and selected by our Quality Control Laboratory, before getting the approval to undergo the activation process. This is the secret behind the quality of W Clay’s end products.

The activation process will go through a certain degree of constant heat temperature to open up the pores and for ionisation, followed by the acid activation process. The product will then be pulverised to maintain an even particle size to maximise oil filtration.