Definition - What does Graphite Flake mean?
A graphite flake is a naturally occurring type of graphite mineral consisting of carbon that has a distinctly flaky morphology and is typically found as discrete flakes. This type of graphite corrodes faster than other forms. Graphite flakes are used as an additive in lubricants and fire-retardant coatings.
Corrosionpedia explains Graphite Flake
Graphite flakes usually form under pressures of 75,000 psi (1 GPa) and 750°C (1380°F) when pure carbon atoms link together to form flat sheets and manifest themselves as large visible flakes or coarsely crystalline graphite. Graphite disseminate in metamorphic rock as thin flakes, which are then separated from the rock by mechanical means.