W1S1011 is a hydrophobic carbon cloth developed by CeTech, designed for use as a gas diffusion layer or electrode substrate in electrochemical systems such as fuel cells and lithium-air batteries. Its hydrophobic treatment enhances water management in acidic electrolyte environments, supporting stable performance and efficient reactant transport. With good electrical conductivity and mechanical flexibility, this material suits both small-scale laboratory studies and prototype development. Available in a standard 25 × 20 cm sheet, it offers practical dimensions for handling and integration into experimental cells. Common research applications include proton exchange membrane fuel cells, direct methanol fuel cells, and metal-air battery systems where controlled hydrophobicity and conductive properties are required.