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GrafGuard® Expandable Graphite Flakes | NeoGraf
Expandable graphite (also known as exfoliated graphite) is produced from the naturally occurring mineral graphite.  The layered structure of graphite allows molecules to be intercalated in between the graphite layers. Through incorporation of acids, usually sulfuric acid graphite can be converted into expandable graphite. 
Graphite Material Supplier | Asbury Carbons
It is also a choice material for powder metallurgy, batteries, fuel cells, refractories, general lubricants, rubber compounds, pencils, gaskets, and polymer systems. Asbury is pleased to offer a ready supply of commercial grade flake graphite in purity ranging from 80-99.9% carbon, and sizes from less than 1um to 800um.