This product has been discontinued.

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Sigracet 39 AA is a non-woven carbon paper gas diffusion media that has no PTFE treatment. It has a total thickness of 280 um (microns). SGL AA is a great low-cost alternative to conventional woven carbon paper Gas Diffusion Layer (GDL) and Gas Diffusion Media 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 39AA is the successor type to Sigracet 35AA. The thickness, areal weight and in-plane permeability (IPP) of 39AA are designed to be comparable to 35AA. However the surface defect rate of Sigracet 39AA 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	280 microns +/- 30 microns
Basic Weight (g/m²)	50 +/- 10 g/m²
Porosity (%)	80%
Compressibility	ca. 38% (at 1 MPa)
Electrical Resistivity (through plane)	< 5 mΩcm² (milliohms cm²)
IP Pressure Drop	0.2 bar (at 1 MPa)
Substrate PTFE Treatment	No PTFE Treatment Applied
Microporous Layer	No Microporous Layer Applied