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Views: 221 Author: Site Editor Publish Time: 2026-09-14 Origin: Site
Nylon and polyethersulfone (PES) are both hydrophilic membrane materials used for liquid filtration. Their similar appearance and overlapping pore sizes can make them seem interchangeable, but the way they behave in a real process is not always the same.
PES is often selected for protein-containing and biological liquids because of its low protein adsorption. Nylon is commonly considered for compatible aqueous liquids, alcohols, selected solvents and high-purity chemical streams. The correct choice depends on what is in the liquid, what must be removed and how much valuable product must be recovered.
This guide compares Nylon vs PES filter cartridges and explains how to select a suitable membrane, pore size and cartridge format for your process.
Choose a PES filter cartridge when low protein binding and product recovery are the main priorities. It is often the starting point for biological media, pharmaceutical solutions, buffers, beverages and other valuable aqueous products.
Choose a Nylon filter cartridge when the liquid is compatible with nylon and solvent resistance, mechanical strength or cost-effective fine filtration matters more than extremely low adsorption. Nylon is used in applications ranging from alcohol-containing liquids and process solvents to ultrapure water and microelectronics chemicals.
Neither membrane is automatically better for every process. The final decision should consider the complete cartridge, including the support layers, end caps, seals, pore rating and operating limits.
Selection factor | Nylon filter cartridge | PES filter cartridge |
|---|---|---|
Wetting behavior | Naturally hydrophilic and generally does not require pre-wetting for aqueous liquids | Naturally hydrophilic and easy to wet with aqueous liquids |
Protein binding | Suitable for many liquids, but adsorption should be checked when product recovery is critical | Commonly selected for low protein adsorption and sensitive biological solutions |
Chemical compatibility | Often considered for alcohols, selected solvents and compatible chemical streams | Suitable for many aqueous solutions, acids, alkalis and selected solvents |
Typical applications | Fine chemicals, microelectronics, ultrapure water, beverages and compatible pharmaceutical fluids | Pharmaceuticals, biotechnology, food and beverage, process water and biological media |
pH range | Depends on the exact grade; LOONG’s FPN Series lists pH 6–12 | Depends on the exact grade; LOONG’s FPS and FCS Series list pH 1–14 |
Common formats | Pleated cartridges and capsule filters | Pleated cartridges and capsule filters |
Main selection advantage | Broad application potential and cost-effective filtration for compatible fluids | Low adsorption, high product recovery and strong aqueous filtration performance |
These differences provide a starting point, but they should not replace a review of the exact product specification. Nylon and PES cartridges from different series may use different support materials, end connections and seals.
PES is often preferred when the filtered liquid contains proteins, active ingredients or other valuable components that should remain in the product. Its low-binding surface helps reduce the amount of product lost through adsorption onto the membrane.
This is especially relevant for biological media, pharmaceutical solutions, buffers and diagnostic fluids. Even a small percentage of product loss can become expensive when the active material has a high value or the batch volume is large.
LOONG’s hydrophilic PES pleated filter cartridge combines a hydrophilic PES membrane with a polypropylene support structure. Different series are available for food and beverage, pharmaceutical, fine chemical, microelectronics and liquid-cooling applications.
PES is also useful when your process needs a naturally hydrophilic membrane with high flow and relatively low pressure drop. Available pore sizes vary by series, allowing the same membrane family to cover clarification, fine filtration and validated microbial-retention applications.
However, selecting a 0.22 μm PES cartridge does not automatically confirm that the entire process is sterile. If microbial control is required, you should also review the cartridge’s retention validation, integrity-test method, installation and operating conditions.
Nylon remains a practical choice for many aqueous and chemical filtration processes. It is naturally hydrophilic, wets easily and provides good mechanical strength. It can also offer useful compatibility with alcohol-containing liquids and selected solvents.
These properties make Nylon filter cartridges relevant to fine chemical production, pharmaceutical process solvents, high-purity water systems, photoresist filtration and microelectronics processes. Nylon is also used for beverages, beer, wine, vinegar and edible oils when the complete cartridge meets the required food-contact and process conditions.
LOONG’s sterilizing-grade Nylon membrane filter cartridge is available in multiple series for pharmaceutical, microelectronics and fine chemical applications. Its listed pore sizes include 0.1, 0.22, 0.45, 1.0, 3.0 and 5.0 μm, allowing buyers to match the filtration level to different process stages.
Nylon should still be tested carefully when the liquid contains valuable proteins or biological molecules. Although a particular cartridge may be designed for low binding, PES is normally the safer starting point when minimizing adsorption is the primary requirement.
The material decision becomes clearer when it is connected to the actual fluid and production stage. The same membrane may perform well in one process and poorly in another because the contaminants, temperature and desired result are different.
For protein solutions, biological media and valuable active ingredients, PES is usually considered first because low adsorption can improve product recovery. The final cartridge should also match the required sterilization method and documentation.
Nylon may still suit pharmaceutical water, solvents, intermediates and other compatible formulations where protein recovery is not the main concern. If a process already uses Nylon successfully, changing to PES should be based on a clear performance or recovery benefit rather than the assumption that one membrane is universally superior.
Both materials can be used in food and beverage processing when the selected cartridge meets the necessary material and compliance requirements.
PES is commonly used for microbial reduction, final filtration and product-sensitive liquids such as beer, wine, juice, dairy products and bottled water. Nylon also works well in compatible beverages and alcohol-containing products.
For compact production lines or smaller batches, LOONG’s Nylon capsule filter provides an enclosed filtration format for bottled water, beverages, beer, wine, vinegar and edible oils. Capsule formats can reduce handling and simplify installation when a full-size cartridge housing is unnecessary.
Nylon is widely considered for polar solvents, alcohols, high-purity water and selected microelectronics chemicals. Its combination of hydrophilicity, strength and solvent compatibility can make it suitable for demanding fine-filtration stages.
PES is also used in microelectronics and fine chemical processes, particularly for ultrapure water, acids, alkalis and applications requiring low extractables. The decision therefore depends on the complete formulation rather than the industry name alone.
For either material, every solvent, cleaning agent and process chemical should be checked against the membrane, support components and O-ring material. A membrane may tolerate the fluid while an unsuitable seal does not.
A pleated membrane cartridge is normally installed inside a reusable housing. This format suits larger production volumes, continuous lines and systems that already have sanitary or industrial filter housings.
A capsule filter combines the membrane and housing in one enclosed unit. It may be easier to use in laboratories, pilot systems, small batches and single-use processes. Capsule filters can also reduce cleaning and handling, although their capacity and connection options must match the process.
LOONG supplies both Nylon and PES options within its membrane filter cartridge range, along with capsule configurations for smaller-volume and disposable filtration requirements. The best format depends on batch volume, available space, connection design and changeout frequency.
It is easy to compare two quotations by looking only at the micron rating, but identical numbers do not always mean identical performance.
A nominal rating describes general particle-removal performance, while an absolute rating is linked to a defined retention efficiency. For microbial-retention applications, the supporting challenge data and integrity-test limits are more important than the pore-size label alone.
Flow must also be compared under the same conditions. Clean-water data provide a useful reference, but a product with higher viscosity or contaminant loading may produce a different pressure drop. When comparing Nylon and PES filter cartridges, ask whether the flow data refer to the same cartridge length, pore size, temperature and test liquid.
A useful quotation begins with the process rather than a part number alone. Share the liquid composition, required flow, operating temperature, batch volume, target contaminant and desired filtration result with the supplier.
If you are replacing an existing filter, provide the current cartridge model, housing connection, length and seal material. This helps prevent problems with fit, bypass or incompatible flow direction.
You should also clarify whether the process requires food-contact documentation, pharmaceutical validation, integrity testing or specific extractables data. These requirements can determine which product series is suitable even when both Nylon and PES appear chemically compatible.
When comparing prices, consider product recovery, service life, replacement frequency and changeout time. A lower-priced cartridge is not economical if it absorbs valuable product or blocks before the batch is complete.
As a filter cartridge manufacturer, LOONG provides Nylon and PES membrane cartridges for food and beverage, pharmaceutical, microelectronics, fine chemical, laboratory and water-treatment applications.
The product range includes multiple pore sizes, cartridge lengths, end connections and sealing materials. Different series are available to meet the documentation and construction needs of different industries rather than applying one general cartridge to every liquid.
For applications requiring supporting technical documents or process qualification, LOONG also provides validation services. Buyers can submit their process conditions and current filter information so the cartridge construction can be matched to the real operating environment.
The Nylon vs PES decision begins with the liquid and the filtration goal. PES is generally the stronger starting point when low protein binding and product recovery matter most. Nylon can be more suitable for compatible alcohols, solvents, high-purity water and general aqueous filtration where adsorption is less critical.
After selecting the membrane family, compare the pore rating, pressure drop, cartridge size, seal material, sterilization method and required documentation. The complete construction determines whether the filter will work reliably in your process.
To discuss a new filtration system or a replacement cartridge, contact LOONG Filtration with your liquid, flow rate, temperature, filtration target and current housing information.
Provide the liquid composition, flow rate, temperature, required micron rating, cartridge length and connection. For replacements, include the current model and housing information.
Not automatically. The replacement must also match the housing, dimensions, seal, flow direction, pressure limits and required retention performance.
Depending on the application, buyers may request a product specification, material list, dimensional drawing, retention data, integrity-test information and relevant compliance documents.
Capsule filters are often more convenient for laboratories, pilot production and smaller batches. Standard cartridges usually suit larger systems with reusable filter housings.
