What is Carbon Capacity?
Activated Carbon Capacity Index Chart Explanation
The capacity index chart lists substances by both chemical and common name. It is a general list of the most common compounds found in the workplace. The efficiency and capacity of activated carbon to adsorb these substances varies with the concentration in the air, relative humidity and temperature. The capacity index numbers are representative under average conditions and may vary under local conditions.
All substances are rated on a scale from 1 – 4.
- Poor adsorption capacity. Substances that are not adsorbed by activated carbon fall into this category.
- Moderate adsorption capacity. Substances are not highly absorbed but might be adsorbed sufficiently to give acceptable results under the particular operating conditions. These require individual checking.
- Satisfactory adsorption capacity. Substances are adsorbed well, but not as efficiently as substances rated 4. One pound of activated carbon adsorbs about 10 to 25% of its weight – average about 1/6 (16.7%).
- High adsorption capacity. Substances are adsorbed very efficiently. One pound of activated carbon adsorbs about 20% to 50% of its own weight – average about 1/3 (33-1/3%). This category includes most of the odor causing substances.
Note: Substances marked with *** are not adequately adsorbed by standard activated carbon. It is necessary to use treated (KMN) carbon to increase the adsorption efficiency.