Hebei Corefra Silicon Nitride Material Co., Ltd was established in 2000 and located in the World famous industrial zone "shijiazhuang"--hebei province, mainly engaged in manufacturing and exporting High Purity Silicon Nitride, Ferro Silicon Nitrie, and all types of Silicon Nitride used in refractory. More than ten years' exploration and innovation, we formed lots of subject development cooperation unit and partial products experimental base. Our company integrates development and manufactu...