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
Sigracet 28 BC Carbon Paper Property Sheet
Sigracet 20 and 30 Series Carbon Paper Property Sheet
Sigracet Carbon Fiber GDL White Paper
Sigracet GDS 2D Recommended Applications
| 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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