Titanium Fiber Felt

The primary market is PEM water electrolysis. In a PEM electrolyzer cell, the anode-side porous transport layer (PTL) must simultaneously conduct electrons from the current collector to the membrane, allow water to diffuse to the reaction surface, and remove oxygen gas from the membrane. Titanium Grade 2 is the required material — at PEM anode potentials in sulfuric acid electrolyte, graphite and carbon-based GDLs corrode rapidly. FILTURE supplies single-layer felt and multi-layer felt assemblies in thicknesses from 0.3 mm to 5 mm, cut to cell dimensions or in sheet rolls for customer die-cutting.

A 0.6 mm felt is also supplied as the cathode gas diffusion layer in high-temperature PEM fuel cells (HT-PEMFC, phosphoric-acid-doped PBI membranes, operating above 160 °C) — titanium is chemically inert under these conditions, while carbon-based GDLs oxidise to CO₂ over time. Felt surfaces can be supplied with a platinum coating for conductivity or a PTFE hydrophobic treatment (around 5 wt% loading) for flooding resistance. A diffusion-bonded felt-plate composite — a porous titanium plate layer fused to a fiber felt layer, typically 0.25 mm + 0.25 mm for a 0.5 mm total — is also available for hydrogen electrolyzer GDL applications requiring both mechanical support and gas-flow distribution.

Secondary applications include pharmaceutical clarification, food processing, and high-temperature gas filtration, where the high void volume (70–80%) gives low pressure drop at high flow rates and good dirt-holding capacity.