Sigracet 22 BC is a non-woven carbon paper with a Microporous Layer (MPL) that has been PTFE treated to 5 wt%.  It has a total thickness of 215 um (microns).  SGL 22 BC is a great low-cost alternative to conventional woven carbon paper Gas Diffusion Layer (GDL) materials.

The Sigracet Carbon Fiber Paper 22 Series is intended to combine the required production robustness and the excellent performance properties.  Stack developers and assemblers are benefiting from the following greatly improved characteristics:

• Greatly improved homogeneity inter-lot and intra-lot.  The overall variability has been shown to be better than +/- 10% (2 sigma)
• Greatly improved surface flatness
• Greatly reduced occurrence of faulty spots on a roll
• Best performance under various operating conditions

Sigracet 22 BC replaces Sigracet 29 BC.  The thickness, areal weight and in-plane permeability (IPP) of 22 BC are designed to be comparable to 29 BC.

Gas Diffusion Layer Properties

• Material Type: Carbon Fiber Paper
• Thickness: 215 microns +/- 20 microns
• Areal Weight: 70 +/- 15 g/m²
• Electrical Resistivity: <10 mΩcm² (milliohms cm²)
• Thermal Conductivity: 0.30 W(m^-1)(K^-1)
• Bending Stiffness (MD/TD): 1.5/0.9 N mm
• Gas Permeability: 1.2 Gurley sec
• Compressibility: 20% (@ 5psi, 1 MPa)
• Water Contact Angle (MPL): >130°
• Roughness (MPL side): 7.2 µm
• Impurities (Fe, Co, Ni) : <10 ppm
• Tensile Strength: 6.9/4.6 MPa (MD/TD)
• Substrate PTFE Treatment: 5%
• Microporous Layer: Yes, on one side