NeoGraf GRAFCELL® FFP-200 SERIES Flow Field Plate Graphite

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NeoGraf GRAFCELL® FFP-200 SERIES Flow Field Plate Graphite
Categories:	Carbon; Graphite
Material Notes:	Manufactured from expanded natural graphite, GRAFCELL® Flow Field Plate (FFP) components retain a continuous graphitic phase. This phase continuity, combined with a low contact resistance, provides electrical and thermal properties in comparison to both synthetic graphite composite and metallic fuel cell components. The thermal diffusivity of GRAFCELL® FFP SERIES products is 8-12 times higher than composite materials and 33 times higher than stainless steel. GRAFCELL® FFP SERIES products have played a critical role in improving fuel cell power density and performance for over 10 years. With over two million kilometers of road experience in car and bus applications annually, GRAFCELL® FFP SERIES continuous phase flow field plates have replaced synthetic graphite as the premier material for PEM fuel cells. Formerly a product of GrafTech.
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Physical Properties	Original Value	Comments

Density	1.50 g/cc
Permeability	<= 1.0	cc/min (1 atm, 15 psi limit)
Thickness	>= 200 microns	Minimum Web
	600 - 3000 microns	plus or minus 100 microns

Mechanical Properties	Original Value	Comments
Tensile Strength at Break	30.0 - 50.0 MPa
Flexural Strength	50.0 - 70.0 MPa

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.000700 ohm-cm	(x-y); ASTM-C611 (4-Point Resistivity Test)
	0.0300 ohm-cm	(z); ASTM-C611 (4-Point Resistivity Test)

Thermal Properties	Original Value	Comments
CTE, linear	1.00 - 5.00 µm/m-°C	(x-y)
	10.0 µm/m-°C	(z)
Thermal Conductivity	5.00 W/m-K	(z)
	275 W/m-K	(x-y)
Glass Transition Temp, Tg	125 °C

Descriptive Properties
Contact Resistance (µOcm²)	8
Thermal Diffusivity (cm²/sec)	1.2

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CGRAF923 / 107327

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