Hardness/Abrasion Hardness/abrasion is also a key factor in selection. Many applications will require the activated carbon to have a high particle strength and a resistance to attrition (The breakdown of material into fines). Activated carbon produced from coconut shells has the highest hardness of activated carbons.
Adsorptive properties Depending on the application (liquid or gas), these properties may be indicated by a number of factors, including the iodine number, surface area, Carbon Tetrachloride Activity (CTC), and Methylene blue.
Apparent density While apparent density will not affect the adsorption per unit weight, it will affect the adsorption per unit volume.
Moisture Ideally, the amount of physical moisture contained within the activated carbon should fall within 3-6%.
Ash content The ash content of activated carbon is a measure of the inert, amorphous, inorganic, and unusable part of the material. The ash content will ideally be as low as possible, as the quality of the activated carbon increases as ash content decreases.
pH value The pH value is often measured to predict potential change when activated carbon is added to liquid.
Particle size Particle size has a direct effect on adsorption kinetics, flow characteristics, and filterability of the activated carbon.
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