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HPD

Particle Size   Hardness
microns 5 SSH 80
µ·inches 200    
Coefficient of Thermal Expansion Electrical Resistivity
microns/m °C 8.1 µ·ohm·cm 2,000
µ·in/in °F 4.5 µ·ohm·in 790
Compressive Strength Apparent Density
N/mm2 150 g/cc 1.77
psi 22,000 lb/in3 0.0640
Flexural Strength Thermal Conductivity
N/mm2 90 watts/m K 85
psi 13,000 BTU·ft/hr·ft2·°F 50
Tensile Strength (1) Oxidation Threshold (2)
N/mm2 60 °C 450
psi 9,000 °F 840

(1) Estimated at 70% of flexural strength.
(2) Temperature that results in 1% weight loss in 24 hours. Oxidation threshold increases by approximately 100� C if graphite is purified.