This product has been discontinued and we are completely out of stock. Sigracet 29 BC was discontinued and permanently replaced by Sigracet 22 BB.

Sigracet 29 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). SGL 29 BC is a great low-cost alternative to conventional woven carbon paper Gas Diffusion Layer (GDL) materials.

The Sigracet Carbon Fiber Paper 29 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 29 BC is the successor type to Sigracet 25 BC. The thickness, areal weight and in-plane permeability (IPP) of 29 BC are designed to be comparable to 25 BC. However the surface defect rate of Sigracet 29 BC is significantly reduced.

Sigracet 20 and 30 Series Carbon Paper Property Sheet

Sigracet Carbon Fiber GDL White Paper

Sigracet GDS 2D Recommended Applications

Sigracet GDL Handling Instructions

Sigracet AB, BA, BC+ Series GDL MSDS

Gas Diffusion Layer Properties
Material Type	Carbon Fiber Paper
Thickness	235 microns +/- 25 microns
Basic Weight (g/m²)	90 +/- 10 g/m²
Air Permeability (s)	1.00 +/- 0.60 cm³/(cm²*s)
Areal Weight	90 +/-10 g/m²
Porosity (%)	80%
Compressibility	ca. 19% (at 1 MPa)
Electrical Resistivity (through plane)	< 12 mΩcm² (milliohms cm²)
IP Pressure Drop	0.8 bar (at 1 MPa)
Substrate PTFE Treatment	5%
Microporous Layer	Yes, on one side