Types segmentation classifies membrane modules by structural configuration, each influencing process economics and performance. Hollow‑fiber modules, dominant in large‑scale protein concentration, deliver high surface‑area‑to‑volume ratios and account for roughly 40 % of unit shipments. Spiral‑wound designs, favored for their compact footprint and ease of scale‑up, serve 35 % of the market, particularly in vaccine and antibody polishing steps. Flat‑sheet modules, offering precise flow distribution and low fouling propensity, hold about 15 % share, primarily in diagnostic reagent purification where product integrity is paramount. Tubular modules, with robust mechanical strength for harsh solvents, occupy the remaining 10 %, mainly in specialized sterile filtration applications. By mapping these configurations to specific process requirements, the market taxonomy clarifies how each type contributes to overall market size, informs supplier positioning, and guides end‑user selection based on throughput, fouling resistance, and regulatory compliance.