... :Ceramic Pyrolytic Boron Nitride PBN Plate,Crucible,Rod,Parts,The High Technology production!Product Overview:Pyrolytic boron ... falls, to a piece of graphite base material, and reaches a certain thickness, the final cooling demolding ... value. 4.Acid, alkali, salt and organic reagents, high temperature, and the vast majority of the molten metal ... : Ceramic Pyrolytic Boron Nitride Plate,Rod And Parts