This product, the CeTech Carbon Paper GDS310-H, is developed as a high-performance gas diffusion layer (GDL) material for advanced electrochemical systems. Featuring a consistent sheet size of 20 cm × 20 cm, it is designed to provide uniform porosity and electrical conductivity, critical for efficient reactant transport and current collection in fuel cells, electrolyzers, and battery research. The material’s optimized structure balances permeability and mechanical integrity, making it suitable for both laboratory-scale testing and prototype development. As a carbon-paper-based substrate, it offers reliable thermal and chemical stability under operating conditions. This GDS310-H variant is intended for researchers seeking a standardized, reproducible platform for evaluating catalyst layers or membrane electrode assemblies, supporting precise experimental control in energy conversion studies.