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Mechanical and physical properties of polycrystalline graphites, tensile strength, compressive strength, flexural strength, Young's modulus, thermal expansion coefficient, electrical resistivity, volume fraction of porosity, and graphitisation were measured for ten brand graphites.Correlation between the mechanical and physical properties of the graphites were studied.Young's modulus and thermal expansion coefficient of the graphites depend on volume fraction of porosity.The Young's modulus of the graphites tended to increase with increasing the thermal expansion coefficient.For an anisotropic graphite, an interesting relationship between the Young's modulus E and the thermal expansion coefficient α was found in any specimen orientations; αE=constant.The value of αE was dependent upon the volume fraction of porosity.It should be noted here that the electrical resistivity increased with decreasing grain size.The flexural and the compressive strength were related with the volume fraction of porosity while the tensile strength was not.The relationships between the tensile, the compressive and the flexural strength can be approximately expressed as linear functions over a wide range of the stresses.

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