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 verifies performance ratings at the lot level using process controls that stay uniform across its entire filtration lineup. Syringe filters span a wide range of membrane chemistries and pore sizes, so the format can be matched to the sample matrix and solvent system in use. PTFE filters aggressive organic solvents without swelling or breakdown while withstanding aggressive organics that degrade other media and reaches the same absolute retention on every run. Thermal-bonded PP construction leaves no seam for sample to bypass the membrane while keeping the sample chemically unaltered across the pass and maintains a low-dead-volume internal flow path. Where analytical results depend on clean samples, the preparation step stays consistent from sample to sample through a pre-tested syringe filter.

Technical Specifications

• Water contact angle near 120 degrees marks strong hydrophobicity
• High porosity minimizes hold-up volume for small sample volumes
• Gas-venting and liquid-blocking function survives repeated autoclave sterilization cycles
• Node-fibril microstructure resists compaction under sustained operating pressure
• Fully fluorinated carbon backbone resists ultraviolet and ozone degradation

Housing Specifications

• Minimal ionic background from the polypropylene housing supports ion chromatography and trace-metal ICP-MS sample preparation.
• Low moisture absorption keeps the housing dimensionally stable through humid storage and shipping
• Burst pressure rating provides a wide safety margin above the rated maximum operating pressure.
• Thermal-bonded construction keeps adhesives out of the fluid path

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 before it moves on to your next process step. Start a live chat with our customer support technicians for quick answers to your compatibility, sizing, and sterility questions.

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

• Water Monitoring - After alcohol pre-wet, PTFE's chemical inertness holds up through repeated environmental sample runs without degrading.
• Dye and Pigment Analysis - Clarifies dye solutions in DMF, NMP, and other aggressive organics ahead of spectrophotometric color strength testing.
• Battery Electrolyte Prep - Clarifies lithium-ion battery electrolyte in carbonate solvents ahead of GC-MS purity and impurity analysis.
• Photoresist Filtration - Clarifies photoresist solutions in organic casting solvent ahead of spin-coating, reducing particulate defect risk.
• Chemical Synthesis - Resists aggressive organic solvents and corrosive acids for compatibility with harsh synthetic reaction mixtures.
• Pump Protection - Acts as a hydrophobic barrier that protects vacuum pumps from corrosive moisture and particulate damage.