Pyrolytic Boron Nitride (PBN) is a highly pure, crystalline form of boron nitride produced by the chemical vapor deposition (CVD) process using BCl₃ and NH₃ under high temperature and low pressure. Unlike standard boron nitride ceramics, PBN crucibles are directly synthesized on precision molds, resulting in a material with extremely high density and a purity level above 99.99% (total impurities <100 ppm). This exceptional purity makes PBN crucibles particularly suitable for semiconductor manufacturing and other high-tech industries where contamination control is critical.

PBN combines the desirable properties of boron nitride with enhanced performance from its unique processing. Like graphite, it maintains excellent strength at elevated temperatures, but with greater mechanical reliability and thermal stability. PBN crucibles exhibit outstanding thermal shock resistance, capable of withstanding rapid temperature changes—for example, PBN plates can be heated to over 2000 °C and then quenched in water without cracking. With these unique characteristics, PBN crucibles deliver long service life, superior reliability, and unmatched performance in the most demanding environments.