Pura Disc 4 mm PTFE Syringe Filters, 0.2um, 100/Pk
Whatman SKU: 6784-0402

Whatman Puradisc PTFE Syringe Filters, 0.2 µm, 4 mm, 100/Pk - 6784-0402

Whatman has built such a strong track record in published methods that laboratories default to citing its name in standardized protocols. As gas moves through the syringe fitting, the hydrophobic membrane blocks bacteria from crossing into the vent line. Hydrophobic PTFE blocks aqueous ingress in vent and gas applications and stays chemically inert against solvents, acids, and alkalis. Polypropylene construction maintains a low-dead-volume internal flow path while resisting degradation from routine sample matrices and sheds virtually no extractable material into the sample. Downstream equipment and work areas stay protected from airborne bacterial contamination once the vent path runs through the membrane.

Technical Specifications

• Validated against an aerosol Brevundimonas diminuta challenge, the sterilizing grade standard for air filtration
• PTFE retains flexibility without embrittlement down to -73°C, allowing filtration of samples taken directly from cold-chain or freeze-thaw storage.
• PTFE's absolute pore rating delivers reproducible retention across every protocol
• 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.
• A laminated polypropylene or polyester support layer raises burst strength for high differential pressure filtration

Housing Specifications

• The seal formed against the membrane blocks bypass at rated operating pressure
• Impact-tolerant polypropylene body withstands routine bench handling without damage
• Polypropylene density near 0.90 g/cm3 keeps housing weight low relative to denser engineering plastics
• Translucent housing wall allows visual confirmation of sample flow during filtration

Removing particulates from organic solvents and reagents before they move downstream keeps contamination out of your results. Reliable solvent prefiltration clears particulates from your organic samples from reaction mixtures and crude extracts through further processing. Describe your application to our technical service team and get pointed to the right filtration product.

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

4mm

Filtration Area

0.2cm²

Holdup Volume

<10µl

Material

Polytetrafluoroethylene (PTFE)

Maximum Operating Pressure

75psi

Maximum Operating Temperature (°C)

100°C

Pack Count

100

Pore Size (µm)

0.2

Prefilter (Yes/No)

No

Sterility

Nonsterile

Sterilization

Autoclavable 121°C

Volume Throughput (ml)

Up to 2ml

Wettability

Hydrophobic

• Chemical Synthesis - Resists aggressive organic solvents and corrosive acids for compatibility with harsh synthetic reaction mixtures.
• Non-Aqueous CE - Prepares non-aqueous electrophoresis samples with low background noise for clean, high-resolution separation and analysis.
• UV Spectroscopy - Clarifies solvent-based samples before UV/Vis analysis, removing scattering particulates for precise, reliable absorbance readings.
• Cryogenic Fluids - Delivers consistent performance across extreme temperature ranges, filtering cryogenic liquids with dependable, reliable results.
• Dissolution Testing - Stops the dissolution reaction and clarifies samples, with low API binding for accurate potency quantitation.
• Toxicology Screening - Clarifies protein-precipitated serum, plasma, and urine extracts ahead of LC-MS or GC-MS drug screening analysis.