Chemical formula: Si3N4 amorphous Purity: >99.0% [O] <0.62% free [Si] <0.2% APS: 20 nm SSA: 115 m2/g True density: 3.4 g/cm3 Bulk density: 0.05 g/cm3 Crystal cell: amorphous Color: White Shelf time: 24 months Properties and features: It possesses high purity, small and uniform particle diameters, large specific surface area, high surface activity, low loose loading density, the violet reflectance larger than 90% and is the best additives of super thin textile absorbing infrared ray, the infrared absorptivity larger than 70%, lower sintering temperature, high mechanical strength, good chemical stability or anti-corrosion and self lubricating. Low formation ceramic temperature of devices, wear aging, especially, large high temperature strength. Because nanometer Si3N4 forms the dispersive phase in composite, general properties of composites are greatly improved. Silicon nitride nano powder composites with chemical materials such as nylon and PET have specialized properties, such as improve electric conductivity, absorb wave. Some applications: 1) Nanostructured Si3N4 devices: For example, in metallurgical, petroleum & chemical industry, mechanical industry, aeronautics and space industry and energy source fields etc., the following devices can be manufactured from it: balls and rollers of roll bearings, slide bearings, covers, valves, turbine, cutting tool, insulation part, spray nozzles (for rockets), spray pipe (for missiles), strengthening materials for Al alloys and other structural devices with high wear resistance, anti-high temperature and anti-corrosion. Now we have developed coatings of SiC/ Si3N4 compostites. it can anti high temperature, wear, strong acides and alkalies except 98% H2SO4. 2) Nanoparticle coating on metal and other materials For example, it may be formed a nano coating on moulds, cutting tools, blades of steam-turbines, rotors of turbines and internal wall of cylinders etc.. Clear anti-scratch coating for cell phone or cars. 3) Composites: Si3N4 nano composites of metal matrixes, ceramic or graphite matrixes; composite paint, binders, rubbers and plastics, and other polymer matrix composites with Nano- Si3N4 particles.