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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