This product has been discontinued and we are completely out of stock. Sigracet 39 BC was discontinued and permanently replaced by Sigracet 39 BB.

Sigracet 39BC is a non-woven carbon paper gas diffusion media with a Microporous Layer (MPL) that has been PTFE treated to 5%. It has a total thickness of 325 um (microns). SGL 39 BC is a great low-cost alternative to conventional woven carbon paper Gas Diffusion Layer (GDL) materials.

The Sigracet Carbon Fiber Paper 39 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 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	325 microns +/- 25 microns
Basic Weight (g/m²)	105 +/- 10
Air Permeability (s)	1.50 +/- 1.00 cm3/(cm²*s)
Porosity (%)	80%
Compressibility	ca. 21% (at 1 MPa)
Electrical Resistivity (through plane)	< 12 mΩcm² (milliohms cm²)
IP Pressure Drop	0.4 bar (at 1 MPa)
Ash Content	< 0.25%
Substrate PTFE Treatment	5%
Microporous Layer	Yes, on one side