Boron Nitride Powders

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Characteristics of Boron Nitride

Thermal

High temperature stability
High thermal conductivity
Good thermal shock resistance
Low thermal expansion

Mechanical

Lubricious
Non-abrasive
Easy to machine
Nucleation agent
Silky touch

Electrical

High electrical resistance
Low dielectric constant
Microwave transparency
Low dielectric loss

Chemical

Inert
Resistant to most molten metals
High oxidation resistance
Negligible outgassing

Optical

White color
Optical transparency
Birefringent
Near-IR absorbance

Environment, Health, and Safety

Non-toxic¹
Non-irritating and non-sensitizing to skin²

Thermal properties

BN has one of the highest thermal conductivities for an electrically insulating material, with an added benefit of superior thermal shock resistance. As a platelet or agglomerated powder, it acts as an effective filler in polymers for thermal management. As a solid, its thermal shock resistance and inertness make it suitable for high-temperature ceramic manufacturing and molten metal processing.

Typical Material Properties

Hexagonal boron nitride (h-BN) is a synthesized ceramic material with unique properties. It has good thermal conductivity, great electrical resistivity, excellent high temperature resistance and chemical inertness, and many other interesting features not easily found in regular ceramic materials.

Property	Typical value
Theoretical density	2.25 g/cc
Thermal conductivity	300 W/mK (a-b plane)
Volume resistivity	10¹⁵ Ω-cm
Dielectric constant	~4.0
Mohs hardness	~1.5

Typical properties are average data and are not to be used as or to develop specifications.

Crystal structure of hexagonal BN

Wide range of BN powder portfolio

Momentive Technologies is a leading global source of boron nitride (BN) powders, which enable high thermal conductivity formulations of thermal interface materials (TIMs). PolarTherm® and CoolFlow®, along with more than 80 grades of BN powders, deliver exceptional thermal conductivity, electrical insulation and lubrication across demanding applications such as electronic materials, aerospace, plastics, metal processing and more.

Single-Crystal Platelets

Mean Particle Size: 5 – 50 µm

Advantages:
Small particle size

Med-Density Agglomerate

Mean Particle Size: 50 – 350 µm

Advantages:
More isotropic than platelets

Pressed Agglomerate

Mean Particle Size: 20 – 350 µm

Advantages:
Robust particles

Spherical Agglomerate

Mean Particle Size: 25 – 65 µm

Advantages:
Isotropic, small particles

Applications

Electronic materials
Aerospace
Plastic
Metal processing

Features and Benefits

Excellent resistance to chemical attack from molten metals significantly extends metal processing component lifespans
Oxidation resistance stabilizes friction levels of high-performance brakes up to 1000°C
High lubricity improves abrasion resistance
Superb dielectric property enables electrical insulation at high voltage and high frequency

Product Grades

Boron Nitride Powders – AC6003-2024

Boron Nitride Powders – AC6004-2024

Boron Nitride Powders – AC6041-2024

Boron Nitride Powders – AC6069-2024

Boron Nitride Powders – AC6111-2024

Boron Nitride Powders – HCP-2024

Boron Nitride Powders – HCPL-2024

Boron Nitride Powders – HCV-2024

Application Articles

Our unique BN expertise allows us to tailor various powder characteristics like purity, crystallinity, surface area, particle size, etc. We are constantly adding new grades to enable new applications and maintain our position as the preeminent supplier of boron nitride powders.