Boron Nitride
Grade: HP
Orientation : Perpendicular
Typical Physical Properties
Compressive Strength at 25 oC : 15 x 103 (ACMA-1) lb/in2
Modulus of Elasticity at 25 oC (Sonic) : 11.4 x 106
Modulus of Rupture lb/in2
at 25 oC: 6,350
at 1000 oC: 6,760
at 1350 oC: 3,495
Density (ASTM C20) : 1.90 g/cm2
Hardness : 205 (K100)
Water Absorption, % Weight Gain : 0.16 (% weight gain in 168 hours at 25 oC and 80%-100% relative humidity).
Typical Thermal Properties:
Thermal Expansion ( oC-1 x 10-6):
75 oC to 500 oC: 0.0
75 oC to 1000 oC: 0.0
75 oC to 1500 oC: 0.09
75 oC to 2000 oC: 1.30
Thermal Conductivity (W/m oC):
at 100 oC: 39.7
at 350 oC: 31.2
at 700 oC: 28.8
Maximum Use Temperature:
Inert or Reducing Atmosphere: 2000 oC
Oxidizing Atmosphere: 1200 oC
Typical Electrical Properties
Dielectric Constant (ASTM [D-150] -1MC): 4.11
Dielectric Strength (volts/mil) : 790
Dissipation Factor (ASTM [D-150] -1MC): 0.0011
Loss Factor (ASTM [D-150] -1MC): 0.0045
Volume Resistivity (ohm-cm):
at 23 oC: 1.6 x 1012
at 150 oC: 4.7 x 1012
Surface Resistivity (ohms):
at 23 oC: >250 x 1012
at 150 oC: >250 x 1012
Insulation Resistance (ohms):
at 23 oC: >250 x 1012
at 150 oC: 0.2 x 1012
Typical Chemical Analysis in Percent:
B 41
N 51
B2O3 0.3
Ca 3
SiO2 0.1
Other: 4.6
Oxidation Rate in Air (wt. loss - mg/cm2 h):
at 712 oC: 0.008
at 1000 oC: 0.017