Grade Chart

Typical Properties of POCO Grades
Grade	ZXF-5Q	ACF-10Q	AXF-5Q	AXM-5Q	AXZ-5Q	TM
Particle Size
microns	1	5	5	5	5	10
µ·inches	40	200	200	200	200	400
Pore Size
microns	0.3	0.8	0.8	0.8	0.7	1.5
µ·inches	12	32	32	32	28	60
Total Porosity
% volume	20	21	20	23	26	20
Open Porosity
% of total	80	75	80	85	90	85
Apparent Density
g/cc	1.78	1.77	1.78	1.73	1.66	1.82
lb/in³	0.0641	0.0637	0.0641	0.0623	0.0598	0.065
Compressive Strength
N/mm²	175	186	138	124	103	110
psi	25,500	27,000	20,000	18,000	15,000	16,000
Flexural Strength
N/mm²	112	97	86	69	52	59
psi	16,200	14,000	12,500	10,000	7,500	8,500
Tensile Strength (1)
N/mm²	79	69	62	48	34	41
psi	11,500	10,000	9,000	7,000	5,000	6,000
Modulus of Elasticity
N/mm²	14,500	11,000	11,000	10,500	9,000	10,500
psi x 10⁶	2.1	1.6	1.6	1.5	1.3	1.5
Tensile Strain
to Failure %	0.78	0.62	0.95	0.99	n/a	n/a
Hardness
SSH	86	95	74	72	69	65
Electrical Resistivity
µ·ohm·cm	1,950	2,460	1,470	1,650	2,030	1,220
µ·ohm·in	770	970	580	650	800	480
Coefficient of Thermal Expansion
microns/m °C	8.1	7.6	7.9	7.8	7.6	8.2
µ·in/in °F	4.5	4.2	4.4	4.3	4.2	4.5
Thermal Conductivity
watts/m K	70	60	95	88	70	105
BTU·ft/hr·ft²·° F	40	35	55	50	40	60
Oxidation Threshold (2)
°C	450	470	450	460	440	460
°F	840	880	840	860	820	860

(1) Estimated at 70% of flexural strength.
(2) Temperature that results in 1% weight loss in 24 hours. Oxidation threshold increases by approximately 100º C if graphite is purified.

Grade Chart

Additional Information