GRAPHITE - ELECTRO GRADE

Typical Properties:

Average Apparent Density(gms/cm³): 1.74

Strength (RT):

              Compressive (psi):           18,000

              Flexural (psi):                   9,500

              Tensile (psi):                     7,000

Hardness (Shore Scleroscope C-2): 73

Average Pore Size (microns): 0.7

Electrical Resistivity (70 ^oF):

              µ Ohm Inches:                  630

              µ Ohm cm:                        1600

Thermal Conductivity (70 ^oF):

              (btu-ft./hr.-ft. ^{2- o}F):         60

              (Cal-cm/sec-cm. ^{2- o}C):    0.25

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

              inch/inch/ ^oF x 10^-6:         4.6

              inch/inch/ ^oC x 10^-6:         8.2

Oxidation Threshold (^oC): 450

Average Purity ppm-total Ash: 700

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: 100 - 300 ppm

Typical Analysis in PPM:

              Fe                        50 - 200               Ti                         1 - 5

              Si                         25 - 200               B                          Trace

              Al                        10 - 50                               Li                         Trace

              Mg                       Trace                                  Ca                        Trace

              V                         50 - 100               K                         Trace

              Ni                        Trace                                  Na                        Trace