1. Specific surface area:
It can be determined by the method of low temperature nitrogen adsorption (BET). This method can also be used in the world. The surface area per gram (m2 / g).
2. Particle size:
The particle size of carbon black listed in the table indicates the primary particle size of carbon black. It is measured by electron microscope and is the average value of particle size of a certain number of particles.
3. Absorption value (DBP absorption value)
Carbon black was adsorbed by o-benzoic acid = butyl ester (DBP). When the adsorption equilibrium occurs, the amount of DBP consumed represents the size of carbon black structure. If the adsorption value is high, the structure of carbon black is high, otherwise it is low.
4. Coloring power:
It indicates the ability of carbon black to dye white body. Generally, it has high coloring power and good covering performance. The test method was carried out according to astm-3265.
5. Volatile matter:
The content of these groups represents the surface chemical properties of carbon black. It is related to pH value.
6. PH value:
It represents the acidity and basicity of carbon black. Generally, the carbon black of furnace process is alkaline (pH > 7). Only after the post-treatment, the pH value of carbon black is between 3-5 and the volatile matter is higher.
The weight of carbon black per unit volume, i.e. (g / L), represents the space occupied by various types of carbon black. The greater the granulation degree is, the greater the apparent density is, and vice versa. The granulation degree has an impact on the dispersion of carbon black (especially used in plastics, paints and inks).
8. Heating loss:
The moisture content of carbon black is determined at a certain temperature, which is related to the formation environment of carbon black