Acetylene carbon black is a high-purity acetylene obtained through the decomposition of by-products from calcium carbide or naphtha (crude gasoline) pyrolysis, followed by continuous pyrolysis to produce carbon black. After the reactor is heated to the starting temperature of acetylene decomposition, which is above 800°C, acetylene is introduced to begin the thermal decomposition process. As it is an exothermic reaction, it can proceed automatically. To maintain consistent quality, the reaction temperature should be kept around 1800°C. The internal reactor temperature can be controlled through the external water-cooled jacket. Acetylene carbon black is used as an anode material in manganese dry batteries, along with manganese dioxide and electrolyte. Compared to furnace black, it has a more developed crystalline and secondary structure, hence it exhibits superior conductivity and absorbency. Due to the low presence of heavy metals and other impurities, the self-discharge loss is minimal, and its storage performance is excellent. Acetylene black has almost dominated the market and is expected to continue with the demand for dry batteries in the future.

Acetylene carbon black is a very fine black powder, with a relative density of 1.95 (by nitrogen displacement method). The apparent density is 0.2～0.3 g/cm3. Average particle size is 30～45nm. Specific surface area is 55～70 m2/g. Iodine adsorption value is 60～80 gI2/kg. Acetylene carbon black has a high purity, with carbon content greater than 99.5%, hydrogen content less than 0.1%, and oxygen content 0.07%～0.26%. pH value is 5～7. It has a low resistivity, offering excellent conductivity, thermal conductivity, and resistance to static effects.