Preparation of expanded graphite with 160 μm mesh of fine flake graphite

Expanded graphite was prepared using the fine flake graphite that could go straight through 160 μm mesh as raw material, using acetic anhydride as inserting agent and potassium dichromate as oxidant. The best process conditions are as follows: m (fine graphite):m (acetic anhydride):m (concentrated sulfuric acid):m (potassium dichromate) = 1:1.0:3.1:0.6, reaction time is 50 min and reaction temperature is 45 °C. The expanded graphite prepared using the fine flake graphite that could go straight through a 160 μm mesh has many good qualities, such as low mass, small pellet, resists high temperature and resists pressure. The expanded graphite is also an excellent material for antistatic and anti-electromagnetic.