Basic Information of Boron Nitride

�� What is Boron Nitride?

Boron Nitride (BN) is a synthetic chemical compound made of boron (B) and nitrogen (N) atoms in a 1:1 ratio.

It is sometimes called “white graphite” because one of its forms resembles graphite in structure and properties.

�� Chemical Basics

• Chemical formula: Boron Nitride (BN)

• Composition: Boron + Nitrogen

• Molar mass: ~24.82 g/mol

• Appearance: White, odorless, non-toxic powder or solid

�� Main Crystal Forms

Boron Nitride exists in several structural forms (polymorphs):

1. Hexagonal Boron Nitride (h-BN)

• Most common form

• Layered structure → similar to graphite

• White, soft, slippery

• Used as lubricant, thermal filler, cosmetic ingredient, etc.

2. Cubic Boron Nitride (c-BN)

• Structure similar to diamond

• Extremely hard (second only to diamond)

• Used as cutting tools, abrasives

3. Wurtzite Boron Nitride (w-BN)

• Rare and very hard

• Formed under extreme pressure and temperature

�� Key Properties

• High thermal conductivity

• Excellent electrical insulation

• High temperature stability (up to ~1000°C in air)

• Chemically inert

• Lubricating ability (h-Boron Nitride)

• Extremely hard (c-BN, w-BN)

�� Common Uses

• Lubricants (especially high-temperature or dry lubricants)

• Thermal interface materials in electronics

• Electrical insulators

• Coatings for high-temperature equipment

• Cutting tools (c-BN)

• Crucibles for metal processing

• Cosmetic powders (soft, silky feel)

�� Safety Notes

• Generally considered non-toxic and safe

• Stable and inert

• Not known to cause environmental or health harm under normal use

�� General Characteristics Summary