Freudenberg E20H is carbon paper that is designed to work in PEM electroyzer 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
Material Type	Carbon Fiber Paper
Thickness	0.185 mm (185 microns) @1 MPa Compression
Basic Weight (g/m²)	113 g/m²
Air Permeability (s)	168 l/m2.s (DIN EN ISO 9237, TP Air Permeability)
Electrical Resistivity	5.5 mOhm.cm2 (TP electrical resistance @ 1 MPa compression)
Substrate PTFE Treatment	Yes, (proprietary PTFE % value)
Microporous Layer	None