The amount of Micropores on activated carbon surface is measured by iodine number. Iodine number is amount of iodine adsorb by activated carbon surface. It is in the range of 600 to 1200 m2/g.
Methylene Blue Number:
The amount of Mesopores is measured by methylene blue number. It gives indication of amount of adsorption capacity of activated carbon for medium sized organic compounds.
The amount of Macropores is measured by Molasses number. It gives measure of amount of decolourization capacity in liquid phase.
As the name suggest, it refers to how much hard activated carbon is. The more the hardness, better it will be resistive against attrition and crushing loss.
Apparent Density represents how kilograms of activated carbon come in liter. Generally coconut shell and coal based activated carbon has density of 0.45 – 0.55 Kg/Liter. So 1 Liter of activated carbon weights between 0.45 Kg to 0.55 Kg.
Mesh size is amount of activated carbon can be passes through or retain by particular sieve. For example, 8x30 US mesh size activated carbon means all the particles passes through 8 mesh (2.38mm) sieves and retained by 30 mesh (0.6 mm) sieves. So all the particles come between sieve size of 8 mesh and 30 mesh refer as 8x30 mesh carbon.
Ash Content reduces capacity of activate carbon and sometimes chemicals gets leach out from activated carbon so for domestic water applications Ash content is very important parameter and less Ash content is better.