The gas black method developed by Degussa in the mid 30s is related to the now historic channel black method developed in the USA, which requires natural gas as raw material. As natural gas was scarcely available in Europe at the time, the Degussa gas black method was developed in 1934 using coal tar distillates as the raw material base. In contrast to channel black facilities, which constitute a very heavy burden to the environment, gas black facilities use the most up-to-date technology. The facilities are constantly vacuumed and the carbon black is separated in filter systems that help keep values clearly below the legally regulated limit values for carbon black in exhaust gas. The gas black method involves conducting a hydrogenous gas over heated oil and conveying the lifting gas, which is saturated with oil vapors, to a burner chamber that has a variety of small burner caps. The numerous small flames beat against a water-cooled cylinder. Part of the resulting carbon black separates on the cylinder; the other part goes in the filter. Subsequently, both carbon black streams are combined.
Further treatment is analogous to the furnace black method. The gas black method is very flexible with regard to adjusting the size of the particles. Gas blacks can be produced in the range of 10 - 30 nm. The carbon black structure cannot be specifically changed. However, this is not a disadvantage because gas blacks inherently have a high, looser structure that results in particularly good dispersibility. Today its application is almost entirely in the field of pigment blacks and its previous importance as soot for tire treads has been almost entirely forgotten.