b. Purity: fixed carbon content of about 98%, or even more than 99 percent, sufficient to meet atomic energy, aerospace and other industrial sectors in the high-purity seal;

c. temperature: In theory, expanded graphite can withstand -200 ¢{ C ¢{ C to 3000. As a filler seal can be -200 ¢{ C ~ 800 ¢{ C used safely. A low temperature brittle, aging, not softening temperature, deformation, the outstanding performance of decomposition;

d. corrosion resistance: a kind of chemical inertia, in addition to strong oxidants such as aqua regia, nitric acid, sulfuric acid and halogen some specific temperature, to adapt to acid, alkali and salt solution, water, steam and other organic solvents most media;

e. excellent thermal conductivity and thermal expansion coefficient of smaller, generic parameters close to sealing device duality of the same order of magnitude materials at high temperature, cryogenic temperature and the drastic changes in working conditions can be good seal;

f.radiation resistance: the neutron ray, and ¦Ã-ray, ¦Á-, ¦Â-ray irradiation, and other long-term without change significantly;

g.permeability: gases and liquids are not good permeability. Because of expanded graphite surface can be very easily form an extremely thin film or film to prevent the infiltration medium;

h. self-lubricating: Expanded Graphite remained flat layered hexagonal structure, forcing the plane layer between relatively easy to produce self-lubricating and sliding to effectively prevent or stem axis of wear and tear

2.Mechanical Properties

a. soft; low hardness, with ordinary tools can be cutting, and arbitrary winding, bending;

b. high: compressibility and elasticity: expanded graphite products, the micro level there are still many small compressible closed the gap, the external force can be reduced, at the same time, because of the small gap in the air with a tension and elasticity.