The hardness of carbon graphite is usually 1.5. Carbon graphite has good self-lubricating properties and is the most widely used friction pair material in the mechanical seal industry.
Differences between carbon graphite, diamond and graphite
Diamond: Carbon atoms are arranged in a three-dimensional space in a "skeleton" shape, with extremely high hardness, Mohs hardness of 10.
Graphite: Carbon atoms are arranged in layers, and the connection between layers is weak, so it is very soft, with a Mohs hardness of only 1.
