Typical Properties:

Average Apparent Density(gms/cm³): 1.82

Strength (RT) :

Compressive (psi):          27,000

Flexural (psi):                 17,500

Tensile (psi):                   10,000

Hardness (Shore Scleroscope C-2) : 88

Average Pore Size (microns) : 0.8

Electrical Resistivity (70 ^oF) :

µ Ohm Inches:                  690

µ Ohm cm:                       1350

Thermal Conductivity (70 ^oF) :

(btu-ft./hr.-ft. ^{2- o}F):           70

(Cal-cm/sec-cm. ^{2- o}C):     0.29

Coefficient of Thermal Expansion (RT to 1000 ^oC) :

inch/inch/ ^oF x 10^-6:         4.7

inch/inch/ ^oC x 10^-6:         8.4

Oxidation Threshold (^oC) : 510

Average Purity ppm-total Ash : <5

Anisotropy (unitless) Variation in Property Values with Direction of Measurement : All grades are isotopic. Variations in property values with direction of measurement are negligible.

Uniformity (unitless) : All grades are homogeneous. Structure and properties are consistent within each piece, from piece to piece, from lot to lot.

Total Ash Range : 5 ppm or less.

Typical Analysis in PPM :

                        Fe          <5

                        Si           <5

                        Al           <5

                        Mg          <5