Overview
Polyethersulfone (PES) membrane is a synthetic polymer membrane derived from polyethersulfone resin, known for its robustness in harsh chemical and thermal environments. It is widely used in critical filtration processes due to its low extractables and high purity. The membrane's porous structure allows for precise separation of particles, making it indispensable in industries requiring sterile conditions. PES membranes are manufactured through phase inversion processes, resulting in controlled pore sizes and high flow rates. Their hydrophilicity reduces fouling, ensuring longevity in applications like bioprocessing and lab-scale filtrations.
Physical and Chemical Properties
PES membranes exhibit exceptional thermal stability, maintaining integrity at temperatures up to 180°C, and resist degradation from acids, bases, and hydrocarbons. Their glass transition temperature (Tg) of approximately 225°C ensures dimensional stability under heat. The material's low protein binding minimizes sample loss in biological applications. Mechanically, PES membranes offer high tensile strength and flexibility, suitable for pleated or stacked configurations in cartridge filters. Their inherent hydrophilicity can be enhanced through surface modifications for specialized uses like virus filtration or cell culture.
Main Applications
In biopharmaceuticals, PES membranes are critical for sterilizing grade filtration of vaccines and monoclonal antibodies, meeting stringent FDA and EMA guidelines. Their low extractables ensure product safety. Water treatment plants utilize PES ultrafiltration modules to remove pathogens and colloidal particles, achieving potable water standards. Diagnostic devices employ PES membranes as lateral flow substrates for pregnancy tests and COVID-19 assays due to their uniform pore distribution. Industrial processes use them for solvent clarification and semiconductor rinsing, leveraging their chemical inertness.
Safety and Storage
While PES is biologically inert, membranes should be handled with powder-free gloves to prevent particulate contamination. Pre-sterilized gamma-irradiated membranes are recommended for aseptic applications. Store sealed in original packaging at 15–30°C; avoid freezing to prevent pore structure damage. Disposal follows local regulations for non-hazardous polymers. Incineration should be conducted in facilities equipped to handle sulfur dioxide emissions, a byproduct of PES combustion.
B2B Procurement Guide
Buyers should prioritize suppliers with ISO 13485 certification for medical-grade membranes. Key specifications include bubble point (indicative of pore size integrity), extractables profile, and compliance with USP Class VI or EP 3.1.3 standards. Bulk orders (100+ m²) typically attract 10–20% discounts. For water treatment, verify NSF/ANSI 61 certification. Custom die-cutting services are available for OEMs integrating membranes into devices. Lead times range from 2–6 weeks for specialty grades.
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