AvCarb EP40T 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 EP40T substrates are highly durable, both chemically and mechanically.

AvCarb EP40T has a Teflon wet-proof coating applied to it.

AvCarb Carbon Papers Properties Sheet

Gas Diffusion Layer Properties
Material Type	Carbon Paper Substrate
Nominal Thickness	.190 mm (190 microns) (@ 7.3psi / 5.1 N/cm²)
Bulk Density	0.22 g/cm3 (@ 0.69 N/cm3 / 1psi)
Break Strength machine direction	6.5 MPa
Break Strength cross machine direction	4.0 MPa
Basis Weight	43 g/m3
Compressibility	10.5% ((22N - 113N)/22 x 100%)
Stiffness machine direction	22 Taber
Stiffness cross machine direction	4.5 Taber
Air Permeability (through-plane)	7.5 sec/100cc
Air Permeability (in-plane)	75 sec/100cc
PTFE Treatment	13 wt%
Microporous Layer (MPL)	None
Membrane Properties
Through-Plane Conductivity (mS/cm)	13.0 mOhm*cm²