AvCarb EP40 Gas Diffusion substrates are unparalleled in their ability to meet the rigorous demands of the fuel cell, including platinum catalyst and functional layer support, effective transport of gases and liquids, and conduction of heat and electricity. Moreover AvCarb EP40 substrates are highly durable, both chemically and mechanically.

AvCarb EP40 is the base substrate used in the gas diffusion layers: GDS3215, GDS3250, and GDS3260.

AvCarb Carbon Papers Properties Sheet

AvCarb Carbon Paper Properties
Material Type	Carbon Paper Substrate
Nominal Thickness (@ 1psi / 0.7 N/cm²)	.200 mm (200 microns)
Nominal Thickness (@ 7.3psi / 5.1 N/cm²)	.190 mm (190 microns)
Nominal Basis Weight	36 g/m3
Break Strength machine direction	5.0 MPa
Break Strength cross machine direction	3.5 MPa
Stiffness machine direction	9.5 Taber
Stiffness cross machine direction	3.5 Taber
Bulk Density (@ 0.69 N/cm3 / 1psi)	0.20 g/cm3
Air Permeability (Gurley) through-plane	4.5 sec/100cc
Air Permeability (Gurley) in-plane	50.9 sec/100cc
Compressibility ((22N - 113N)/22 x 100%)	14.0%
Through-Plane Resistivity	8.0 mOhm*cm²
Substrate PTFE Treatment	None
Microporous Layer (MPL)	None