Boron Nitride

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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