About PBN
PBN means pyralytic boron nitride, or CVD made boron nitride. It has very high purity, perfect structure but only available in thin sheets or thin wall shapes
About hBN
hBN, or hot pressed boron nitride is sintered by hexagonal BN flakes. It is a machinable material. BN blanks could be as large as 16"x16"x8".
Manufacturing
BN custom shape prodcuts could be produced by CNC machining the boron nitride blanks.