Boron Nitride

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For over 60 years we have been a precision machining and polishing fabricator of parts from all technical ceramics, sapphire, glass and quartz. We machine these materials to very precise tolerances (many times measured in millionths of an inch) for dimension, flatness, wedge and roundness or cylindricity. Our customers typically have a critical application that requires extremely tight tolerances in ultra-hard materials. We also have the capability to grind and polish spherical radius parts in a variety of hard materials, both inside and outside diameters, to optical requirements.

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Many of the properties of Boron Nitride vary significantly with the grade of the material.

PropertyValue
General
Chemical Formula

BN

Mechanical
Density
1.9 - 2.1 gm/cc
Hardness

25-205 Knoop

Tensile Strength
3.9-12.1 kpsi
Modulus of Elasticity

9.4 x 106 psi

Flexural Strength
11.2 kpsi
Compressive Strength
45 kpsi
Poisson's Ratio
0.05
Electrical
Dielectric Strength
950 ac V/mil
Dielectric Constant
4.08 (@ 1 MHz)
Volume Resistivity

> 1014 ohm-cm

Thermal
Coefficient of Thermal Expansion

2.3 - 10 x 10-6/°C

Thermal Conductivity
1.9 - 160 W/mK
Specific Heat
0.14 cal/g °C
Maximum Working Temperature
850-3000 °C Inert Atm

All properties are at room temperature unless otherwise noted.

Engineering data are representative, and are not intended as absolute nor warrantable. Manufacturer’s Data shown is blended from multiple sources and therefore illustrates the marketplace.

*Click on a Property to see a comparison of up to 10 materials