Charcoal activated by heating to 800-900ºC to form a material of high adsorptive capacity for many gases, vapors, organics, etc. Has a large internal surface area (approx 1,000 m2/g). Commonly used in the pharmaceutical industry to remove organic contaminants. Can be used either as an additive in granular form which is then filtered out or as a filter media in a filtration device itself.