Syringe Filters PES Membrane 33mm 0.22um Sterile Pack of 50

Our review of the Syringe Filters PES Membrane 33mm 0.22um examines a laboratory-grade disposable filter aimed at routine sterile filtration tasks. This pack of 50 delivers an accessible balance of performance and convenience: the key reason to buy is reliable sterile filtration with formal challenge-test validation, which makes these filters suitable for critical pre-filtration and buffer clarification where bioburden control and low extractables matter.

Key Features

• Validated sterile filtration: Challenge test (BCT) with LRV>7 for Brevundimonas diminuta confirms high retention for small bacteria.
• Biocompatible membrane: PES membrane certified to USP class VI reduces leachables and is appropriate for sensitive samples.
• Sterile and individually packed: Each filter is gamma-sterilized and individually packaged to protect sterility until use.
• High flow and throughput: The large filtration surface gives excellent flow rate for faster processing of buffers and culture media.
• Secure, molded housing: Polypropylene housings are molded to provide a reliable seal without adhesives, reducing contamination risk.
• Standard luer connections: Female luer-lock inlet and male luer slip outlet fit common syringe setups for straightforward use.

Who It's For

The Syringe Filters PES Membrane 33mm 0.22um is aimed at lab technicians, research groups, and production staff who need a dependable sterile filter for pre-filtration, mobile sample prep, and clarification of buffers and culture media. Its low protein affinity and low extractables make it well suited for assays or preparations where sample integrity matters.

Those working with very viscous or particulate-heavy fluids may prefer a larger cartridge or a dedicated membrane system for higher capacity work; this product is best for syringe-scale filtration tasks rather than bulk inline filtration of large process volumes.

Pros & Cons

Pros

• Validated retention (LRV>7) offers confidence in sterile filtration performance.
• Individually gamma-sterilized units keep filters ready-to-use and reduce handling contamination.
• PES membrane with USP class VI certification minimizes extractables and protein binding for sensitive applications.
• Well-designed luer fittings and molded housings ensure easy, leak-free connections.

Cons

• Pack size of 50 is optimized for frequent use; occasional users may find this quantity larger than needed.
• Not intended for high-viscosity or heavy particulate burdens where prefilters or larger housings would be needed.

Specifications

Our Verdict

The Syringe Filters PES Membrane 33mm 0.22um in a pack of 50 is a practical, validated choice for labs needing reliable sterile filtration at syringe scale. Its challenge-test validation, USP class VI membrane certification, and individually gamma-sterilized packaging make it a good value for routine buffer preparation, media clarification, and analytical sample work where low extractables and dependable performance matter.

Frequently Asked Questions

Are these filters sterile out of the package?
Yes, each filter is individually packaged and sterilized by gamma radiation to maintain sterility until opened.

What size connections do the filters use?
The filters have a female luer-lock inlet and a male luer slip outlet for standard syringe compatibility.

Is the membrane suitable for protein solutions?
The PES membrane has low affinity for proteins and low extractables, making it appropriate for many protein-containing buffers, though very sticky samples may still benefit from prefiltration.