# Boron Nitride Grade XP

Grade XP boron nitride is a grade of hexagonal boron nitride. The graph bars on the material properties cards below compare grade XP boron nitride to other non-oxide engineering ceramics (top) and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

## Thermal Properties

Maximum Temperature: Corrosion

2800 *°C* 5070 *°F*

Maximum Temperature: Mechanical

1750 *°C* 3180 *°F*

Specific Heat Capacity

1470 *J/kg-K* 0.35 *BTU/lb-°F*

Thermal Conductivity

96 *W/m-K* 56 *BTU/h-ft-°F*

Thermal Expansion

0.54 *µm/m-K*

## Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz

4.0

Dielectric Strength (Breakdown Potential)

80 *kV/mm* 3.1 *V/mil*

Electrical Dissipation At 1 Hz

0.0017

Electrical Dissipation At 1 MHz

0.00075

Electrical Resistivity Order of Magnitude

13 *10 ^{x} Ω-m*

## Other Material Properties

Compressive (Crushing) Strength

21 *MPa* 3.0 *x 10 ^{3} psi*

Density

1.9 *g/cm ^{3}* 120

*lb/ft*

^{3}Elastic (Young's, Tensile) Modulus

14 *GPa* 2.0 *x 10 ^{6} psi*

Flexural Strength

18 *MPa* 2.5 *x 10 ^{3} psi*

Poisson's Ratio

0.11

## Common Calculations

Stiffness to Weight: Axial

4.1 *points*

Stiffness to Weight: Bending

42 *points*

Thermal Diffusivity

34 *mm ^{2}/s*

## Followup Questions

## Further Reading

Handbook of Refractory Carbides and Nitrides: Properties, Characteristics, Processing and Applications, Hugh O. Pierson, 1996

Ceramics and Composites: Processing Methods, Narottam P. Bansal and Aldo R. Boccaccini (editors), 2012

IEC 60672-3: Ceramic and glass-insulating materials - Part 3: Specifications for individual materials

Springer Handbook of Condensed Matter and Materials Data, W. Martienssen and H. Warlimont (editors), 2005

Sintering of Advanced Materials: Fundamentals and Processes, Zhigang Zak Fang (editor), 2010