Carbon black is virtually pure, elemental carbon in the form of colloidal particles, which
are microscopic and arranged in a grape-like form. Its physical appearance is that of a
black, finely divided pellet or powder – individual particles of carbon black are invisible to
the human eye. Carbon black is entirely different from, and should not be confused with,
black carbon, more commonly known as soot.
The size of the particles and the way they are aggregated determine the specific
properties of the carbon black and how it can be used. For example, a large
particle-sized “soft” carbon black grade will contribute to the elasticity of tire sidewalls,
while a small particle-sized “hard” carbon black grade is essential to ensure the
durability of a tire’s tread.

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