Key Technical Specifications
| Parameter | Specification |
|---|---|
| Membrane Material | Hydrophilic Polyethersulfone (PES) |
| Pore Size Options | 0.1 μm / 0.22 μm / 0.45 μm / 1.0 μm |
| Diameter Options | 13 mm / 25 mm / 33 mm / 50 mm |
| Housing Material | Medical-grade Polypropylene (PP) |
| Operating Pressure | Up to 6 bar (87 psi) |
| Temperature Resistance | 5°C – 90°C |
| Filtration Area | Optimized for fast aqueous flow |
| Extractables Level | Low extractables, suitable for sensitive biological analysis |
Why PES Membrane for Aqueous Solutions?
✔ Hydrophilic Nature
Unlike PTFE membranes, PES is naturally hydrophilic, meaning it does not require alcohol pre-wetting. This reduces sample preparation steps and avoids contamination risks.
✔ Ultra-Low Protein Binding
PES has extremely low adsorption to proteins and biomolecules, making it ideal for:
Enzymes
Antibodies
Cell culture media
Biological buffers
✔ High Flow Rate Efficiency
The asymmetric pore structure allows:
Faster filtration speed
Lower back pressure
Reduced clogging risk
FAQ:
1: Why is PES better than PTFE for aqueous solutions?
PES is naturally hydrophilic, while PTFE is hydrophobic and requires pre-wetting. PES provides faster and simpler filtration for water-based samples.
2: Can PES syringe filters be used for proteins?
Yes. PES has very low protein binding, making it ideal for biological and protein-based samples.
3: Is PES suitable for organic solvents?
No. PES is mainly designed for aqueous solutions. For organic solvents, PTFE or PVDF membranes are recommended.
4: What pore size is best for HPLC sample preparation?
0.22 μm is recommended for fine particle removal and column protection, while 0.45 μm is commonly used for routine analysis.
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