Grade	JC3 Graphite	JC4 Carbon
	Scleroscope Hardness	40	60
	Maximum Particle Size	0.008in	0.008in
	Coefficient of Thermal Expansion	1.6in/inF (-6)	1.6in/inF x 10(-6)
	Thermal Conductivity	7.5 BTU/sq.ft/F/hr	38 BTU/sq.ft/ft/hr
	Maximum Operating Temp in Air	1000F	500F
	Apparent Density	1.70-1.74gm/cc	1.68gm/cc
	Total porosity	15-20%	15%
	Specific Resistance	40x10 (-5) ohm.in	20x10 (-5) ohm.in
	Flexural Strength	3500 psi	4500 psi
	Compressive Strength	8100	9600
	Ash Maximum	0.1%	0.6%
	Manufactured Process	Extruded	Extruded
	Composition	Graphite	Carbon Graphite