The total porosity of graphite products can be calculated according to the true density and bulk density of the tested samples.

Total porosity =（d_u-d_k）/d_u*100%

d_u - True density，g/cm³；

d_k - Bulk density，g/cm³。

The total porosity of graphite products (generally referred to as porosity) includes two different forms of porosity, one is the open pore connected with the external atmosphere, the other is the closed pore which is not connected with the external atmosphere.

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