HOPG

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Highly ordered pyrolytic graphite (HOPG) is a lamellar material and consists of stacked planes. Carbon atoms within a single plane interact more strongly than with those in adjacent planes.
Each atom within a plane has three nearest neighbors, resulting in a honeycomb-like structure. This two-dimensional single-atom thick plane is called graphene.

HOPG terminated with a graphene layer can serve as an ideal atomically flat surface to be used as a substrate or standard for SPM investigations. This is also an easily “cleavable” material with a

Technical Features

Density ...................................... 2.266 g/cm3

Thermal conductivities:
thermal conductivity parallel (002) ......................................1700 ± 100 W/(m·K)
thermal conductivity perpendicular (002) ......................................8 ± 1 W/(m·K)
electrical conductivity parallel (002) ......................................2.1 ± 0.1 x 106 [(Ω·m)-1]
electrical conductivity perpendicular (002) ......................................5 x 102 [(Ω·m)-1]

There are several grades of single - or doublesided HOPG with thickness 1 mm or more:

ZYA GradesZYb GradesZYH Grades
Mosaic Spread0.4°± 0.1°0.8°± 0.2°3.5°± 1.5°