1. Exterior: white fine powder 2. Moisture content: less than 0.03 3. Average particle size: 20-100 micro 4. Tensile strength: 8 Mpa 5. Fracture elongation: 60% 6. Appaent density: 0.56g/ square centimeter 7. Thermal gravitational: less than 0.2%Wt 8. Corrosion resistance: No change 9. Melting point: 327 more or less centigrade 10. Decomposition temperature: 430 centigrade 11. Melt viscosity: 102-106 Pa.S