Freudenberg E20H is carbon paper that is designed to work in PEM electrolyzer as the cathode gas diffusion layer. This is a teflonized (also known as hydrophobic-treated) carbon paper without MPL. It has a thickness of ~185 µm (microns or micrometers) under 1 MPa compression.

Freudenberg E20H is recommended for:

-Low temperature proton exchange membrane (LT-PEM) electrolyzer applications

Freudenberg Fuel Cell and Electrolyzer Carbon Paper GDLs Technical Data Sheet

Freudenberg Fuel Cell and Electrolyzer Carbon Paper GDLs SDS

Gas Diffusion Layer Properties
X-Material Type	Carbon Fiber Paper
Thickness	0.185 mm (185 microns) @1 MPa Compression
X-Basic Weight (g/m²)	113 g/m²
Air Permeability (s)	168 l/m2.s (DIN EN ISO 9237, TP Air Permeability)
X-Electrical Resistivity	5.5 mOhm.cm2 (TP electrical resistance @ 1 MPa compression)
Substrate PTFE Treatment	Yes, (proprietary PTFE % value)
Microporous Layer	None