Freudenberg H23C3 is a flexible and easy to use carbon paper Gas Diffusion Layer (GDL) with a Microporous Layer (MPL) as well as a hydrophobic treatment. It is recommended for low humidity systems, open cathode designs and air systems. It is 235 um (microns) thick @ 1 MPa compression.

Freudenberg H23C3 is designed to keep the membrane wet. It is used in high temperature or very dry fuel cell applications.

Freudenberg H23C3 is recommended for:

• Power densities up to 0.5A/cm²
• Stationary CHP Low humidified cathodes
• Low Temperature Polymer Electrolyte Fuel Cell (LT-PEMFC) Backup, Air-cooled, and Off-Grid applications

Freudenberg H23C3 is formerly known as H2315 I2 C3.

Freudenberg Carbon Paper GDL Properties Sheet

Freudenberg Fuel Cell and Electrolyzer Carbon Paper GDLs SDS

Gas Diffusion Layer Properties
Material Type	Carbon Fiber Paper
Thickness	.235 mm (235 microns) @ 1 MPa Compression
Air Permeability (s)	15 (TP Air Permeability acc. to Gurley (ISO 5636-5))
Electrical Resistivity (through plane)	9 mΩ/cm² (TP Electrical Resistance @ 1 MPa compression)
Substrate PTFE Treatment	Yes, (proprietary PTFE % value)
Microporous Layer	Yes, on one side (with proprietary PTFE % value)