SGL Sigracet 22BB is a carbon fiber paper used as a gas diffusion layer (GDL) in fuel cells and electrolyzers. The substrate is made water-repellent with 5% PTFE and carries a microporous layer (MPL) on one side. A GDL spreads gas to the catalyst layer, conducts electrons and helps remove water. It is supplied as a 100 × 100 mm sheet.

22BB is the thinnest and lightest SGL paper in this group (215 ± 20 µm, 70 g/m²) and has the lowest through-plane resistance (< 10 mΩ·cm²). Compared with the thicker 39BB (315 µm) and 38BC (325 µm), it suits thin cell designs and work needing low resistance. Catalyst ink is normally coated on the MPL side; do not mix up the two faces.

Key Features

Water-repellent carbon fiber paper treated with 5% PTFE
Microporous layer (MPL) on one side
Thickness 215 ± 20 µm, areal weight 70 ± 15 g/m² (manufacturer data)
Low through-plane resistance: < 10 mΩ·cm² (manufacturer data)
Water contact angle above 130° on the MPL side
100 × 100 mm sheet
Cutting can release fine carbon fibers and dust; work in a well-ventilated area

Technical Specifications

Material	Non-woven carbon fiber paper (GDL)
Thickness	215 ± 20 µm
Areal weight	70 ± 15 g/m²
PTFE treatment	5% (substrate)
Microporous layer (MPL)	Yes, on one side
Through-plane resistance	< 10 mΩ·cm²
Gas permeability	1.2 Gurley s
Compressibility	20% (1 MPa)
Water contact angle (MPL)	> 130°
Size	100 × 100 mm