Pura Disc 25mm PTFE Syringe Filters, 0.2um, 200 Pk
Whatman SKU: 6785-2502

Whatman Puradisc PTFE Syringe Filters, 0.2 µm, 25 mm, 200/Pk - 6785-2502

Whatman verifies performance ratings at the lot level using process controls that stay uniform across its entire filtration lineup. The hydrophobic membrane stays dry and open to gas flow, so a vent line keeps running without wetting out during a single filtration cycle. The PTFE membrane withstands aggressive organics that degrade other media and filters aggressive organic solvents without breakdown. Low-extractable polypropylene keeps sample purity intact through the filtration pass and stands firm against aqueous acids, bases, and alcohols during regular handling. A vent or gas line stays free of airborne bacteria once a hydrophobic, sterilizing-grade membrane is in the path.

Technical Specifications

• PTFE retains flexibility and crack resistance at cryogenic temperatures down to -200°C, suiting filtration ahead of liquid nitrogen and ultra-low-temperature sample storage.
• Low moisture absorption and minimal tare mass support accurate gravimetric analysis in PM2.5 air monitoring
• Stable across a wide operating temperature range for demanding methods
• PTFE's fully fluorinated carbon backbone resists degradation from prolonged ultraviolet and ozone exposure, sustaining membrane integrity through extended outdoor and ambient air sampling deployments.
• Hydrophobic PTFE holds a water contact angle near 120 degrees

Housing Specifications

• Stable across the full aqueous pH range in routine sample work
• Medical-grade polypropylene with broad chemical compatibility
• Translucent housing wall allows visual confirmation of sample flow during filtration
• The seal formed against the membrane blocks bypass at rated operating pressure

Filtering aggressive solvents and reagents through a filter that holds up to the chemistry keeps your sample prep reliable. Solvent-stream filtration handles the solvents and reagents your methods rely on from initial prep through final use. Bulk pricing kicks in on larger filtration orders, so ask the Tisch Scientific team for a quote.

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

Bubble Point (psi)

1.0 bar (15 psi) [IPA]

Burst Pressure (psi)

75psi

Connection Type

Luer-Lok/ Luer Slip

Construction

Polypropylene

Diameter

25mm

Filtration Area

4.2cm²

Flow Rate

~20 (MeOH)

Holdup Volume

<100µl

Material

Polytetrafluoroethylene (PTFE)

Maximum Operating Pressure

75psi

Maximum Operating Temperature (°C)

121°C

Pack Count

200

Pore Size (µm)

0.2

Prefilter (Yes/No)

No

Sterility

Nonsterile

Sterilization

Autoclavable 121°C

Volume Throughput (ml)

Up to 100ml

Wettability

Hydrophobic

• Spirits Congener Analysis - Clarifies distilled spirits samples ahead of GC analysis, protecting columns from residue during congener profiling.
• UV Spectroscopy - Clarifies solvent-based samples before UV/Vis analysis, removing scattering particulates for precise, reliable absorbance readings.
• Agrochemical Formulation QC - Clarifies technical pesticide concentrates in organic solvent ahead of HPLC potency and impurity analysis.
• Mobile Phase Prep - Extends column life by consistently removing particulates from organic HPLC mobile phases before every injection.
• Toxicology Screening - Clarifies protein-precipitated serum, plasma, and urine extracts ahead of LC-MS or GC-MS drug screening analysis.
• Extractables Testing - Clarifies packaging material organic solvent extracts ahead of LC-MS analysis, keeping background low for leachable detection.