Density measurements using the helium displacement method yield values between
1.8 and 2.1 g cm-3 for different types of carbon black. A mean density value of 1.86 g cm-3 is commonly used for the calculation of electron microscopic surface areas. Graphitization raises the density to 2.18 g cm-3. The lower density with respect to graphite (2.266 g cm-3) is due to slightly greater layer distances.
4.1.5