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Grade Chart

Typical Properties of POCO Grades
Grade ZXF-5Q ACF-10Q
AXF-3Q
AXF-5Q
AXM-5Q
AXZ-5Q
TM 
Particle Size
µm 1 5 5 5 5 5  10
µin 40 200 200 200 200 200 400 
Pore Size
µm 0.3 0.8 0.8 0.8 0.8 0.7
1.5 
µin 12 32 32 32 32 28
60 
Total Porosity
% volume 20 21 21 20 23 26 20 
Open Porosity
% of total 80 75 77 80 85 90 85 
Apparent Density
g/cm³ 1.78 1.77 1.76 1.78 1.73 1.66 1.82 
lb/in3 0.0641 0.0637 0.0636 0.0641 0.0623 0.0598  0.065
Compressive Strength
MPa 175 186 156 138 124 103  110
psi 25,500 27,000 22,600 20,000 18,000 15,000  16,000
Flexural Strength(1)
MPa 112 97 90 86 69 52 59 
psi 16,200 14,000 13,000 12,500 10,000 7,500 8,500 
Tensile Strength(2)
MPa 79 69 63 62 48 34  41
psi 11,500 10,000 9,100 9,000 7,000 5,000 6,000 
Modulus of Elasticity
N/mm2 14,500 11,000 11,000 11,000 10,500 9,000 10,500 
10psi
2.1 1.6 1.6 1.6 1.5 1.3  1.5
Tensile Strain
to Failure % 0.78 0.62 0.82 0.95 0.99 n/a n/a
 
Hardness
SSH 86 95 80 74 72 69  65
Electrical Resistivity
µΩ-cm 1,950 2,460 1,815 1,470 1,650 2,030 1,220 
µΩ-in 770 970 715 580 650 800  480
Coefficient of Thermal Expansion
µm/m °C 8.1 7.6 8.1 7.9 7.8 7.6  8.2
µ·in/in °F 4.5 4.2 4.5 4.4 4.3 4.2  4.5
Thermal Conductivity(3)
W/m-K 70 60 85 95 88 70 105 
Btu·ft/hr·ft2·°F 40 35 50 55 50 40 60 
Oxidation Threshold (4)
°C 450 470 455 450 460 440  460
°F 840 880 850 840 860 820  860
Measured using 4-point bend method

2 Estimated at 70% of flexural strength

3 Estimated value
4 Temperature that results in 1% weight loss in 24 hours. Oxidation threshold increases by approximately 100º C if graphite is purified