Pura Disc 4 mm PTFE Syringe Filters, 0.45um, 100/Pk
Whatman SKU: 6784-0404

Whatman Puradisc PTFE Syringe Filters, 0.45 µm, 4 mm, 100/Pk - 6784-0404

Whatman draws on Cytiva's broader manufacturing oversight while continuing a legacy of filtration work that touches laboratory research, environmental monitoring, and industrial processing alike. Syringe filters give the analyst a single-use device for clarifying samples right at the bench. PTFE filters aggressive organic solvents without swelling or breakdown and withstands aggressive organics that degrade other media. The polypropylene housing keeps the sample chemically unaltered across the pass while resisting degradation from routine sample matrices and sustains efficient flow on viscous samples. Where analytical results depend on clean samples, syringe filtration removes particulates at the moment of preparation.

Technical Specifications

• PTFE retains membrane integrity across repeated autoclave sterilization cycles at 121°C to 134°C
• PTFE's fully fluorinated backbone leaves the membrane insoluble in all known organic solvents, avoiding the swelling and pore distortion that can affect less chemically resistant membrane polymers.
• PTFE carries a UL 94 V-0 flammability rating, the highest self-extinguishing classification for polymer materials
• PTFE resists attack from strong oxidizing agents such as nascent chlorine and concentrated sodium hydroxide, supporting filtration of hypochlorite-based disinfectant and cleaning validation samples.
• PTFE's low ionic and metallic extractable profile supports ultrapure water filtration ahead of semiconductor wet-bench processes requiring high resistivity water

Housing Specifications

• Medical-grade polypropylene with broad chemical compatibility
• Impact-tolerant polypropylene body withstands routine bench handling without damage
• Burst pressure rating provides a wide safety margin above the rated maximum operating pressure.
• Stable across the full aqueous pH range in routine sample work

Handling the harsh solvents your methods demand means choosing a filter built to withstand what passes through it, run after run. Reliable solvent prefiltration clears particulates from your organic samples so your downstream method starts with a clean sample. 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)

0.6 bar (9 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)

0.45

Prefilter (Yes/No)

No

Sterility

Nonsterile

Sterilization

Autoclavable 121°C

Volume Throughput (ml)

Up to 2ml

Wettability

Hydrophobic

• Venting Applications - Protects vacuum pumps and vents bioreactors using a hydrophobic PTFE membrane that forms a reliable air barrier.
• Photoresist Filtration - Clarifies photoresist solutions in organic casting solvent ahead of spin-coating, reducing particulate defect risk.
• Battery Electrolyte Prep - Clarifies lithium-ion battery electrolyte in carbonate solvents ahead of GC-MS purity and impurity analysis.
• Air Monitoring - Ensures precise capture of airborne particulates for environmental analysis in demanding atmospheric monitoring conditions.
• Non-Aqueous CE - Prepares non-aqueous electrophoresis samples with low background noise for clean, high-resolution separation and analysis.
• Toxicology Screening - Clarifies protein-precipitated serum, plasma, and urine extracts ahead of LC-MS or GC-MS drug screening analysis.