The first aspect is the flexural strength of the material. The flexural strength of a material is a direct reflection of its strength, indicating the tightness of its internal structure. Materials with high strength have relatively good resistance to loss during discharge. For electrodes with high precision requirements, it is recommended to choose materials with better strength.

The second aspect is the Shaw hardness of materials. In the subconscious understanding of graphite, it is generally considered a relatively soft material. But actual test data and application situations show that the hardness of graphite is higher than that of metal materials. In the special graphite industry, the commonly used hardness inspection standard is the Shore hardness measurement method

The third aspect is the average particle diameter of the material. The smaller the average particle size of the material, the more uniform the discharge of the material, the more stable the discharge condition, and the better the surface quality. For forging and die-casting molds with low surface and precision requirements.

The fourth aspect is the inherent resistivity of the material. If the average particles of the material are the same, the discharge speed of the material with high resistivity will be slower than that of the material with low resistivity. For materials with the same average particle size, materials with low resistivity will also have slightly lower strength and hardness than materials with high resistivity.