Pyrolytic Boron Nitride (PBN)

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Source: https://www.innovacera.com/product/pyrolytic-boron-nitride
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Pyrolytic boron nitride is a grade of hexagonal boron nitride. It is produced by the chemical vapor deposition process to create its solid body and all the boron nitride crystals grow parallel to the surface on which the vapor is deposited.

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