The significance of the activated carbon evaluation index is as follows:

Activated carbon iodine value
"Iodine value" is an index indicating the degree of unsaturation of an organic compound, and refers to the mass number (g) of iodine that can be adsorbed (added) with respect to 100 g of a substance. It is mainly used to measure oil, fatty acid, wax and polyester. The higher the degree of unsaturation, the higher the iodine value. The iodine value of activated carbon refers to the amount of iodine adsorbed on the activated carbon in the aqueous solution. The iodine value is related to the surface area of ​​pores with a diameter greater than 10A (1A=0.1nm), and the iodine value can be understood as an indicator of the total pore volume. Iodine adsorption value is used to describe the adsorption capacity of activated carbon on liquid substances.

Activated carbon molasses value
　　 Molasses value is a measure of the relative decolorization ability of activated carbon in a boiling molasses solution. The molasses value is interpreted as a surface area with a pore diameter greater than 28A. Since molasses is a multi-component mixture, this parameter must be tested strictly in accordance with the instructions. The molasses value is obtained by treating the molasses liquid with the activated carbon standard sample and the activated carbon sample to be tested using the optical density ratio of the filter. The molasses value indicates the relative decolorization ability of activated carbon relative to the boiling molasses solution.

Activated carbon bulk density
　　Bulk density is a measure of the quality of a certain amount of charcoal. Gradually add up to 100 ml of activated carbon to the graduated cylinder and measure its mass. This value is used to calculate the amount of activated carbon required to fill a specific adsorption device. In short, the bulk density is the mass of activated carbon per unit volume.

Activated carbon particle density
　　Particle density is the mass of particulate carbon per unit volume, excluding the space between the particles and cracks larger than 0.1 mm. The density of the particles is measured by replacing mercury. In fact, people usually call the particle density the real density.
Activated carbon carbon tetrachloride value
　　 The carbon tetrachloride value is an indicator of the total pore volume and is measured using a gas flow through a saturated 0C CCl:25C carbon bed. Measure the mass of adsorbed CCl until the mass change of the sample is negligible within the specified time interval. Benzene and carbon tetrachloride are used as representatives of easily adsorbable gases to evaluate the adsorption performance of granular activated carbon. They are a measure of the advantages of granular activated carbon over easily adsorbable gases.

Activated carbon methylene blue value
　　 methylene blue value means the number of milligrams of methylene blue adsorbed when 1.0 g powdered activated carbon and 1.0 mg/L methylene blue solution reach equilibrium. The methylene blue adsorption value is used to indicate the ability of activated carbon to decolorize.
Activated carbon hardness
　　 Hardness is a measure of the mechanical strength of activated carbon. The mass change is expressed as a percentage. More precisely, the hardness value indicates the resistance of the granular activated carbon to the collapsing motion of the steel ball in the RO-TAP machine. After the carbon is in contact with the steel ball, the hardness value is calculated using the mass of carbon in the sieve.

Activated carbon wear value
　　Abrasion value is an index used to measure the abrasion resistance of activated carbon. This experiment measures the change of MPD (loss value), expressed as a percentage. The wear value of granular activated carbon indicates that the particles reduce the resistance of the particles during processing. It is calculated by contacting the carbon sample with steel balls in the RO-TAP machine and measuring the ratio of the average diameter of the final particles to the average diameter of the original particles.

Activated carbon alkane number
　　Butane number refers to the amount of butane adsorbed per unit mass of activated carbon after saturated air and butane pass through a layer of carbon at a certain temperature and pressure.

Activated carbon ash
　　Activated carbon usually contains inorganic substances such as aluminum and silicon. Ash is the residue left after burning carbon into powder after burning at 954C for 3 hours. From a technical point of view, ash is a component of activated carbon mineral oxide. It is usually defined as the mass percentage of a certain number of samples after being oxidized.

Activated carbon moisture
　　Moisture measures the amount of water contained in charcoal. Moisture is measured by boiling activated carbon in a xylene solution using a Dean-Stark trap and condenser. To test for moisture, the water will condense and be trapped in the arm container to be measured. The moisture content of activated carbon can also be determined by the change in the quality of activated carbon after drying at 150C for 3 hours. Moisture is the mass percentage of water adsorbed on activated carbon. In the case of activated carbon used for various purposes, various materials and methods are often used to test its performance.