How to make Reverse Osmosis membrane-Part 2
Reverse Osmosis membrane including domestic reverse osmosis membrane and Industry reverse osmosis.
July 15, 2025 – As the global demand for Water Treatment technologies continues to rise, the spotlight falls on the complex yet precise production ofindustrial reverse osmosis (RO) membrane elements, widely used in seawater desalination, wastewater recycling, and ultrapure water generation.
Industrial RO membrane elements are engineered through a detailed and structured manufacturing process. The core components include a central tube, tube stickers, membrane flat-sheets, permeate carriers, feed spacers, end cap (ATDs), brine seals, product tape, and connectors. Each part plays a crucial role in ensuring filtration efficiency and durability under high pressure.
The production process mirrors that of domestic RO membranes, but with significant differences in size and material strength. Common sizes such as 4040 and 8040 RO membrane refer to dimensions (4 or 8 inches in diameter and 40 inches in length), and each size requires tailored sheets and spacers to match its flow requirements and pressure ratings.
The manufacturing begins with layering the membrane flat-sheet with a permeate carrier and feed spacer. These are carefully rolled around the central tube in a spiral-wound configuration. Tube stickers ensure precise alignment, while ATDs are installed at both ends to prevent internal shifting. Brine seals and connectors are affixed to enable leak-proof integration into RO systems.
Once assembled, each membrane element undergoes strict quality testing, including pressure testing, salt rejection analysis, and visual inspection. Only units that meet international performance standards proceed to final packaging and shipment.
As industries worldwide adopt more sustainable water solutions, the importance of reliable and high-performance RO membrane elements continues to grow. Manufacturers are investing in automation and material innovation to improve output, longevity, and cost-efficiency—ensuring clean water is accessible even in the most challenging environments.