ELECTRONIC SPACE PRODUCTS INTERNATIONAL

1050 Benson Way, Ashland, OR 97520

Toll Free (800) 638-2581 * Fax (541) 488-8313

E-Mail: sales@espimetals.com

GRAPHITE - ESPI SUPERCONDUCTIVE GRADE

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