Freudenberg E35 is carbon paper that is designed to work in PEM electroyzer as the cathode gas diffusion layer. This is a carbon paper without MPL and has no Teflon treatment (or no hydrophobic treatment). It has a thickness of ~275 µm (microns or micrometers) under 1 MPa compression.

Freudenberg E35 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	0.275 mm (275 microns) @ 1 MPa Compression
Basic Weight (g/m²)	164 g/m²
Air Permeability (s)	179 l/m2.s (DIN EN ISO 9237, TP Air Permeability)
Electrical Resistivity	8.5 mOhm.cm2 (TP electrical resistance @ 1 MPa compression)
Substrate PTFE Treatment	None
Microporous Layer	None