Poco Graphite Premium Graphite Glass Forming Graphite GF Graphite

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Poco Graphite Premium Graphite Glass Forming Graphite GF Graphite
Categories:	Carbon; Graphite
Material Notes:	GLASSMATE® GF is the base grade of glass forming materials with high strength and durability for glass forming applications. GF materials provide higher product yield through improved glass surface finishes and a match to high CTE glass products. Entegris POCO offers purification of each GM-GF material to allow for increased oxidation resistance through the elimination of metallic contaminates that react to oxygen present in the glass forming process. The purification process reduces impurities to 5 ppm (99.9995%) or less as determined by ash analysis. Features: World class microstructure. Higher level of interconnected porosity. Tighter correlation between particle and pore. Improved purity levels. Isotropic mechanical properties. Increased machining capabilities. Higher physical strength. Information provided by Entegris POCO Materials.
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Physical Properties	Original Value	Comments

Density	1.74 g/cc
Particle Size	<= 3.0 µm
Pore Size	0.800 microns
Ash	<= 0.30 %	< 3000 ppm ash

Mechanical Properties	Original Value	Comments
Hardness, Shore D	72
Flexural Strength	13350 psi	Measured using three-point bend method.
Compressive Strength	18800 psi

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.00147 ohm-cm

Thermal Properties	Original Value	Comments
CTE, linear	8.10 µm/m-°C
Thermal Conductivity	85.0 W/m-K	Room temperature; as temperature increases, thermal conductivity decreases.
Maximum Service Temperature, Air	450 °C	Oxidation threshold; weight loss after 24 hours is about 1%

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CPOCO403 / 268788

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