Expansion in the new energy and biopharmaceutical sectors is accelerating domestic substitution for high-precision liquid filter bags.
2026-06-23
In 2025, the domestic liquid filtration bag market is projected to reach RMB 7.63 billion, maintaining double-digit growth for five consecutive years. Two key sub‑segments—purification of new‑energy electrolytes and sterile filtration in biopharmaceuticals—are emerging as the primary drivers of growth. With continued expansion of power‑battery production capacity, demand for non‑leaching, organic‑solvent‑resistant polypropylene/PTFE composite filter bags has surged in the lithium‑ion battery material purification stage, accounting for nearly 30% of the industry’s total annual procurement volume.
In the pharmaceutical industry, routine GMP inspections are driving companies to upgrade their sterile filtration consumables, with the penetration rate of 0.22 μm high‑precision melt‑blown liquid filter bags continuing to rise. For low‑protein‑adsorbing filter bags that were previously reliant on imports, domestic filtration‑material manufacturers have achieved technological breakthroughs; their melt‑blown seamless welding and gradient multilayer filtration processes have matured, boosting the domestic market share to 43.6%.
The procurement dynamics across the industry have shifted markedly: end‑user manufacturers no longer focus solely on price, but instead place greater emphasis on filter bag dirt‑holding capacity, acid‑ and alkali‑resistance lifespan, and total‑life‑cycle operating costs. Leveraging their strengths in the new‑energy and food sectors, the Yangtze River Delta and the Pearl River Delta are seeing rapid growth in customized liquid‑filter‑bag orders. Meanwhile, biodegradable PLA liquid filter bags have achieved small‑batch mass production, meeting the environmental and compliance requirements of food‑ and daily‑chemical export markets, and are poised to become a key driver of future growth.
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In addition to the filter bag, which is a critical component of the filter, the filtrate itself is another essential element. During operation, if you notice that the filtrate has become cloudy, do not hesitate—this clearly indicates a problem.
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