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Purity Information

Unpurified POCO graphites have typical impurity levels of about 1000 ppm, but they can have up to 3000 ppm. The dominant impurity is vanadium, with some iron, calcium, nickel, titanium, and silicon. Gaseous impurites do not show up in ash tests, and may be present in small amounts in purified materials. POCO's purification reduces impurities to 5 ppm (99.9995%) or less as determined by ash analysis. The process is recognized by a -2 after the grade.

  

Typical Purified Poco Graphite: GDMS Elemental Data Analysis

Element Concentration (ppm wt)
Na <0.005*
Mg <0.005*
Al 0.09
K <0.005*
Ca <0.005*
Ti 0.02
V 0.002
Mn <0.001*
Fe 0.03
Ni 0.01
Cu <0.001*
Zn <0.005*
*Denotes value below detection limits
 

Typical Material Properties

  ZEE-2 DFP-3-2 PYROGRAPH SCF-2
Particle Size 1 4 5 6
Apparent Density (g/cc) 1.77 1.82 1.56 1.77
Flexural Strength (psi) 15,000 12,000 7,750 13,500
Compressive Strength (psi) 30,000 20,000 14,200 25,000
Electrical Resistivity (µ-ohm-in) 1,260 600 790 960
Shore Hardness 100 74 66 91
CTE(µ-in/in/C) 8.4 8.1 7.5 7.6
Purity 99.9995% 99.9995% 99.9995% 99.9995%
Pyrolytic Carbon     12% pick-up  
  
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