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