Pura Disc 25mm PTFE Syringe Filters, 0.45um, 50 Pk
Whatman SKU: 6784-2504

Whatman Puradisc PTFE Syringe Filters, 0.45 µm, 25 mm, 50/Pk - 6784-2504

Whatman has built such a strong track record in published methods that laboratories default to citing its name in standardized protocols. Under hand pressure from the syringe, the membrane captures particulates as the sample passes through. PTFE stays chemically inert against aggressive solvents, strong acids, and alkalis in service and blocks aqueous ingress in vent applications. The polypropylene housing presses snugly against the membrane during the pass and routes flow to minimize backpressure in service. When chromatographic methods demand particle-free injections, point-of-use syringe filtration clarifies the sample before it reaches the column.

Technical Specifications

• PTFE carries a UL 94 V-0 flammability rating, the highest self-extinguishing classification for polymer materials
• PTFE retains flexibility without embrittlement down to -73°C, allowing filtration of samples taken directly from cold-chain or freeze-thaw storage.
• PTFE resists hydrofluoric acid, clearing particulate from acid-digested samples ahead of ICP-MS and ICP-OES trace metals analysis.
• PTFE resists chemical attack across the full pH 1 to 14 range
• 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.

Housing Specifications

• The seal formed against the membrane blocks bypass at rated operating pressure
• Stable across the full aqueous pH range in routine sample work
• Impact-tolerant polypropylene body withstands routine bench handling without damage
• Polypropylene housing tolerates ethylene oxide gas sterilization cycles without softening or dimensional distortion.

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 from reaction mixtures and crude extracts through further processing. Contact Tisch Scientific for technical guidance on selecting the right filtration product for your specific application requirements.

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

25mm

Filtration Area

4.2cm²

Flow Rate

~30 (MeOH)

Holdup Volume

<100µl

Material

Polytetrafluoroethylene (PTFE)

Maximum Operating Pressure

75psi

Maximum Operating Temperature (°C)

121°C

Pack Count

50

Pore Size (µm)

0.45

Prefilter (Yes/No)

No

Sterility

Nonsterile

Sterilization

Autoclavable 121°C

Volume Throughput (ml)

Up to 100ml

Wettability

Hydrophobic

• Air Monitoring - Ensures precise capture of airborne particulates for environmental analysis in demanding atmospheric monitoring conditions.
• Battery Electrolyte Prep - Clarifies lithium-ion battery electrolyte in carbonate solvents ahead of GC-MS purity and impurity analysis.
• Pump Protection - Acts as a hydrophobic barrier that protects vacuum pumps from corrosive moisture and particulate damage.
• Agrochemical Formulation QC - Clarifies technical pesticide concentrates in organic solvent ahead of HPLC potency and impurity analysis.
• Chemical Synthesis - Resists aggressive organic solvents and corrosive acids for compatibility with harsh synthetic reaction mixtures.
• Mobile Phase Prep - Extends column life by consistently removing particulates from organic HPLC mobile phases before every injection.