Sigracet 28 BC

Brand: SGL Carbon
Product Code: 63070016

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Sigracet 28 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 235 um (microns). The hydrophobic treatment produces water repellent properties which prevent the highly porous carbon fiber backings from flooding and actively support the water management of PEM fuel cells. SGL 28 BC is a great low-cost alternative to conventional woven carbon paper Gas Diffusion Layer (GDL) materials.

The Sigracet Carbon Fiber Paper 28 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
  • Recommended Applications: PEMFC stationary, PEMFC automotive
Gas Diffusion Layer Properties
Material Type Carbon Fiber Paper
Thickness 235 microns +/- 25 microns
Areal Weight 105 +/- 10 g/m²
Bending Stiffness (MD/TD) 1.7 / 1.2 N mm
Gas Permeability 4.5 Gurley sec
Compressibility ca. 11% (at 1 MPa)
Electrical Resistivity (through plane) < 11 mΩcm² (milliohms cm²)
Water Contact Angle (MPL) > 130°
Roughness (MPL side) 6.4 µm
Impurities (Fe, Co, Ni) < 10 ppm
Tensile Strength 6.6 / 5.1 MPa (MD/TD)
Substrate PTFE Treatment 5%
Microporous Layer Yes, on one side
Other Plate Properties
Thermal Conductivity 0.38 W(m^-1)(K^-1)

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