Filter membranes and syringe filters are specialty consumables for analytical laboratories, QC operations and small-volume sample prep — covering disc membranes, syringe filters and coupon media. Disc membranes are available in 13, 25, 47, 90 and 142 mm diameters, in PTFE, PVDF, PES, Nylon66, and Cellulose Acetate, with retentions from 0.1μm to 0.45μm.
Syringe filters are single-use units combining a 0.2μm / 0.22μm / 0.45μm membrane with a PP housing, widely used for HPLC/UPLC sample prep, UV-Vis spectroscopy, sterile injection pre-filtration, and cell culture clarification. Coupon media are small square swatches of filter material used for compatibility testing and initial screening.
Typical applications: HPLC/UPLC/GC-MS sample preparation, small-volume sterile filtration of injectables and IV drips, sterile filtration of cell culture media, lab analytical pretreatment, QC solution clarification, drug dissolution testing (USP <711>), and diagnostic reagent sterilization.
Frequently Asked Questions
Which syringe filter to choose for HPLC sample prep?
Difference between 0.45μm and 0.22μm disc membranes?
Technical Articles in This Category
Understand the principles and how to read the specs before you choose.
Liquid Filter Efficiency: From Conventional to Nanometer Test Methods
The same filter can be marketed as 99.9% or 99.99% — it depends on β-ratio, LRV and challenge particle. This article covers the full spectrum from nominal/absolute rating to bacterial challenge to EUV gold sol challenge.
PTFE Filter Selection Guide: Hydrophilic vs Hydrophobic
PTFE is hydrophobic by nature — water beads up on its surface while gas passes freely. Hydrophilic PTFE is a surface-modified variant. This article walks through a fluid decision tree, real bubble point data, and 6 common selection pitfalls.
Chemical Compatibility Guide for Filter Material Selection
Acids, bases, oxidizers, organic solvents — which material survives? A complete compatibility matrix (chemical × 7 materials), semi & pharma references, plus matching O-ring guidance.
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