Expandable Graphite is a carbon material in which sulfuric acid are intercalated between the layers of Flake Graphite. The layers of graphite (graphene) are bonded by interatomic bond with a weak vertical force, and it can insert liquid between the layers. The layers are expanded by the vaporization energy of the liquid sulfuric acid inserted between the layers at applying heat of 100 to 300°C, and the volume expands to 200 times or more.
1. Expandable Graphite is widely used as flame retardant. It is a halogen-free substance and is added to and compounded into building materials and automobile parts.
2. Developing to various thermoplastic resins, rubbers, and elastomers, the applications are expanding as fire-resistant and providing flame-retardant property.