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Grade Chart

Grade GM LT HT SR
Average Particle Size
µ·in 197 197 197 394
µ·m 5 5 5 10
Apparent Density
g/cc 1.74 1.77 1.74 1.80
lb./in.3 0.063 0.064 0.063 0.065
Compressive Strength
psi 18,800 22,500 19,700 15,600
MPa 130 155 136 108
Flexural Strength
psi 11,800 12,500 11,800 8,400
MPa 81 86 81 58
Hardness
Shore 74 96 74 68
Coefficient of Thermal Expansion
µin/in°F 4.5 4.7 4.5 4.6
µm/m°C 8.1 8.5 8.1 8.3
Thermal Conductivity (1)
Btu-ft/h-ft2-°F 50 35 50 57
W/m-K 85 60 85 98
Electrical Resistivity
µOhm-in. 580 965 580 575
µOhm-m 14.7 24.5 14.7 14.6
Oxidation Threshold (2) (Standard Grade)
°F 842 878 1,125 860
°C 450 470 607 460
(1) Approximate values taken at room temperature; as temperature increases, thermal conductivity decreases.
(2) Oxidation threshold is defined as temperature at which oxidation weight loss after 24 hours is approximately 1%.