Purity Information

Thursday, May 23, 2013

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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

	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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