PBN Coated Graphite Morgan Advanced Materials' Technical Ceramics business PBN coated graphite components are the best choice to extend heater life or temperature capability in MBE and CIGS PV applications. Our high purity PBN is an excellent material to coat graphite components due its chemical inertness, thermal stability, thermal shock resistance, electrical insulation and anisotropic thermal properties. These unique properties not only extend heater life but provide electrical breakdown protection in heater applications.