PES Mini-UniPrep Syringeless Filters, 0.45um, Translucent Housing, Slit Septum Cap, 100/Pk
Whatman SKU: US203NPUPES

Polyethersulfone (PES) Syringeless Filters - US203NPUPES

A single syringeless device replaces the separate syringe, filter, and transfer vial, cutting both setup time and the handling steps where analyte is lost or contaminated. PES stays stable across the full pH 1 to 14 range while accepting water-based reagents without preconditioning and delivers sharp particle cutoff at the rated pore size. Polypropylene construction maintains a low-dead-volume internal flow path and resists degradation from routine sample matrices. For the analyst, that consistency means chromatographic results with less run-to-run variability traced back to sample preparation.

Technical Specifications

• Broad compatibility with aqueous buffers, aliphatic alcohols, glycols, and strong bases
• Naturally hydrophilic surface wets without pre-wetting in aqueous applications
• Stable across the full pH 1 to 14 operating range
• Low protein binding preserves dilute analytes for maximum recovery
• Absolute pore size rating gives consistent results across protocols

Housing Specifications

• Low extractable contribution protects sensitive downstream analyses
• Medical-grade polypropylene with broad chemical compatibility
• Resists aqueous acids, bases, and alcohols in routine sample prep
• Thermal-bonded construction keeps adhesives out of the fluid path

Holding a leak-free seal through every needle puncture keeps your injections clean from the first to the last. Consistent autosampler-ready components keep your chromatographic methods reproducible so injection-to-injection variability stays low. Start a live chat with our customer support technicians to confirm closure and septa compatibility for your method.

For more information about chemical compatibility, please review our Chemical Compatibility Chart.

Material

Polyethersulfone (PES)

Pore Size (µm)

0.45

Sterility

Nonsterile

Wettability

Hydrophilic

• Direct Sample Filtration - Built-in membrane clarifies the sample in one manual step, cutting transfer steps before chromatographic injection.
• Bioanalytical Sample Cleanup - Low-binding membranes clarify plasma and serum extracts, retaining drug analytes for accurate quantitation.
• Solubility Assay Filtration - Positive-pressure filtration cleanly clarifies small sample volumes, supporting accurate solubility determination.
• Protein Precipitation Cleanup - Low protein binding retains analyte integrity when filtering precipitated sample supernatants.
• Ion Chromatography Prep - PES membrane compatibility with aqueous and mixed-solvent matrices gives low-binding clarification for IC injection.
• Pharmaceutical QC Testing - Content uniformity and dissolution samples are clarified in one step, reducing handling before chromatographic injection.