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Highly oriented pyrolytic graphite sheets are obtained by pyrolyzing single-layer graphite sheets. In this process, the graphite sheets are heated to high temperatures, causing the carbon atoms in the single-layer graphite sheets to diffuse and form a hexagonal grid structure. This structure gives highly oriented pyrolytic graphite sheets a more uniform distribution of carbon atoms, thereby improving their electrical conductivity.
Highly oriented pyrolytic graphite flake grades and sizes

Room temperature properties of PG, HOPG and single crystal graphite
