It has been found that the carbon products are prepared from the variant pitch material alone without any binding material and any filler. The standard procedure of the new method and some properties of the products are described in this report.
The variant pitch materials are prepared from coal -tar pitch and otherpitch -like materials by use of the varied pretreatments, for example, distillation, ozonization, oxidation in air or chlorination. The higher softening points than 170°C are required to the variant pitch materials available for this method. Specimens are formed by pressing (100-2000Kg/cm
2) or slipcasting .After preheatingin air, carbonization is carried out under nitrogen up to the desirable temperature.
The properties of the products obtained vary in the following ranges with the sort of the variant pitch and the condition of moulding.
Shore hardness 60-130, porosity 60-8%, bulk density 0.75-1.40.
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