Metric Felt Company
708-479-7979
Typical Properties of Carbon and Graphite Felts
English Units   S.I. Units    
Unit Value Unit Value
  CH Grade GH Grade   CH Grade GH Grade
Carbon Content wt% 94 99.7 wt% 94 99.7
Ash Content wt% 1 0.03 wt% 1 0.03
Thermal Conductivity Btu●in/h● 0.37 0.48 W/m●K 0.053 0.069
at 120 F (50) ft2●F
Electrical Resistivity
at 70 F (23 C)
Longitudinal 10-3 85-103 80-100 10-3 220-260 200-250
Transverse Ohm●in 54-70 75-85 Ohm●in 138-180 200-209
Tensile Strength
at 70 F (23 C)
Longitudinal psi 27 8 Pa 0.19 0.06
Transverse psi 39 13 Pa 0.27 0.09
Splitting Resistance
at 70 F (23 C)
Longitudinal lb/in 0.2 0.09 N/m 35 16
Transverse lb/in 0.2 0.08 N/m 35 14
Linear Shorinkage % 1 0 % 1 0
Availalble Materials
Nominal Thickness in (mm) Nominal Weight, lb/yd2 (kg/m2)
CH Grade GH Grade
1/8 ( 3) 0.5 (0.27) 0.5 (0.27)
1/4 (6) .09 (0.49) .09 (0.49)
3/8 (10) 1.8 (0.98) 1.8 (0.98)
1/2 (13) 2.0 (1.08) 1.9 (1.03)
3/4 (19) 3.0 (1.63) 2.8 (1.52)
1 (25) 4.3 (2.33) 3.5 (1.90)
All are available as rolls from 3 to 21 yards (2.74 to 19.2) in length and in widtsh to 42" (1.07m).
Special size pieces can b e cut per customer cupplied drawings for furnace kits and for fabrication of
thermal isnulation systems in conjunction with other materials.