Description
Overview
21-A6L, 21-A6H and 21B-A4G are carbon paper gas diffusion layer (GDL) materials designed for PEM fuel cells, water electrolyzers and related hydrogen energy systems. Belonging to the same 215 µm carbon paper family, these grades offer controlled porosity, hydrophobic PTFE-treated structure and reliable conductivity for gas transport and stack integration. Within this series, 21-A6L and 21-A6H provide balanced mechanical strength and permeability, while 21B-A4G offers lower electrical resistance for applications requiring enhanced conductive performance.
Key Features
- 215 µm carbon paper GDL for PEM fuel cells and water electrolyzers
- Available in three grades: 21-A6L, 21-A6H and 21B-A4G
- Hydrophobic PTFE-treated structure with high contact angle
- Controlled MPL and fiber surface roughness for component matching
- Porosity of ≥ 70% across the series
- Low electrical resistance, down to < 10 mΩ·cm²
- Suitable for laboratory testing, pilot-scale evaluation and industrial hydrogen applications
Technical Specifications
| Property | 21-A6L | 21-A6H | 21B-A4G | Unit |
|---|---|---|---|---|
| Product Type | Carbon paper GDL | Carbon paper GDL | Carbon paper GDL | — |
| Areal Weight | 85 ± 15 | 85 ± 15 | 80 ± 15 | g/m² |
| Thickness | 215 ± 20 | 215 ± 20 | 215 ± 20 | µm |
| Compressed Thickness (at 1.0 MPa) | 175 ± 20 | 175 ± 20 | 165 ± 20 | µm |
| Surface Roughness (MPL) | < 6 | < 6 | < 6 | µm |
| Surface Roughness (Fiber) | < 20 | < 20 | < 20 | µm |
| PTFE Content (MPL) | ≥ 25 | ≥ 25 | ≥ 25 | % |
| PTFE Content (GBDL) | 10 ± 3 | 10 ± 3 | 10 ± 3 | % |
| Contact Angle (MPL) | > 135 | > 135 | > 135 | ° |
| Contact Angle (Fiber) | > 125 | > 125 | > 125 | ° |
| Porosity | ≥ 70 | ≥ 70 | ≥ 70 | % |
| Bending Stiffness (MD) | ≥ 0.8 | ≥ 0.8 | > 1 | mN·m |
| Bending Stiffness (TD) | ≥ 0.6 | ≥ 0.6 | > 0.7 | mN·m |
| Compression Set | ≤ 15 | ≤ 15 | — | µm |
| Electrical Resistance | ≤ 15 | ≤ 15 | < 10 | mΩ·cm² |
| TP Air Permeability (Fresh) | 2.0 ± 1.0 | 1.9 ± 0.3 | 3 ± 2 | cm²/cm²·s |
| TP Air Permeability (at 1.0 MPa) | 1.2 ± 0.1 | 1.4 ± 0.1 | 2.3 ± 0.3 | cm²/cm²·s |
| IP Air Permeability (at 1.0 MPa) | ≤ 100 | ≤ 100 | ≤ 100 | mbar |
Applications
- PEM fuel cells
- Water electrolyzers
- Hydrogen energy systems
- Gas diffusion layer and stack component integration
- Research, pilot testing and industrial evaluation
Commercial Note
Prices shown on this page are indicative reference prices and may vary depending on quantity, packaging format and market conditions. Listed prices exclude VAT, shipping and any custom cutting or packaging services. Bulk orders, customized dimensions and distributor cooperation are available upon request. Please contact us for detailed quotations and technical support.
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