Pura Disc 25mm PES Syringe Filters, 0.45um, 200 Pk
Whatman SKU: 6781-2504

Whatman Puradisc Polyethersulfone (PES) Syringe Filters, 0.45 µm, 25 mm, 200/Pk - 6781-2504

Whatman standardizes its manufacturing platform to the point that consistency and thorough lot-level records come as a default, exactly what analytical laboratory work demands. Because each syringe filter is dedicated to one sample, a failed or contaminated filtration never delays the next analyst's run waiting on a shared holder. PES delivers sharp cutoff at rated pore size and keeps that modified surface active throughout use. Polypropylene construction holds its dimensional form through high-temperature sample preparation while pressing snugly against the membrane during the pass and sustains efficient flow on viscous samples. When method reproducibility rests on consistent sample prep, syringe filtration holds that standard injection after injection.

Technical Specifications

• Operating temperatures up to 130°C leave mechanical integrity intact
• Antibody and protein samples pass through PES with minimal adsorptive loss
• Absolute pore size rating holds consistent across every lot
• Inherent hydrophilicity allows instant aqueous wetting with no pre-wetting step
• Ionic extractables from the membrane stay very low

Housing Specifications

• Withstands standard 121°C steam autoclave cycles without softening or structural distortion
• Stable across the full aqueous pH range in routine sample work
• Burst pressure rating provides a wide safety margin above the rated maximum operating pressure.
• Minimal ionic background from the polypropylene housing supports ion chromatography and trace-metal ICP-MS sample preparation.

A clean particulate separation keeps your aqueous sample preparation dependable. General-purpose aqueous filtration supports the sample types you handle every day across your water-analysis and general analytical workflows. Ask about Whatman's quality documentation to confirm your filtration step meets a recognized laboratory-science standard.

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

Bubble Point (psi)

2.3 bar (33 psi)

Burst Pressure (psi)

75psi

Connection Type

Luer-Lok/ Luer Slip

Construction

Polypropylene

Diameter

25mm

Filtration Area

4.2cm²

Holdup Volume

<100µl

Material

Polyethersulfone (PES)

Maximum Operating Pressure

75psi

Maximum Operating Temperature (°C)

121°C

Pack Count

200

Pore Size (µm)

0.45

Prefilter (Yes/No)

No

Sterility

Nonsterile

Sterilization

Autoclavable 121°C

Volume Throughput (ml)

Up to 100ml

Wettability

Hydrophilic

• Sample Recovery - Minimizes sample loss in low-protein-binding applications, delivering high yield for precious or rare biological specimens.
• Organic Carbon Testing - Clarifies water samples ahead of DOC and UV254 analysis while keeping organic carbon adsorption to the membrane minimal.
• Urine Drug Screening - Clarifies protein-poor urine samples for dilute-and-shoot LC-MS/MS toxicology testing without adsorbing target drug analytes.
• PFAS Water Testing - PES filters process aqueous samples for EPA Method 1633A PFAS testing without added fluorinated background.
• Biological Assays - Protects sensitive enzymatic and antibody-based assays from particulate interference without adsorbing critical reagents.
• Pesticide Residue Testing - PES membranes improve polar pesticide recovery in food-safety LC-MS/MS testing versus hydrogen-bonding nylon.