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Click HERE to download the White Paper, Extractables & Retention Volume of AQ NDX - Depth Filters.


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Best-in-Class | HPLC Sample Prep | Dissolution Testing | Proprietary Membranes

These syringe filters are recommended for "pharmaceutical" grade HPLC Sample Prep & Dissolution Testing when GLP and GMP are required. Manufactured with proprietary and various membrane types in 25mm, 13mm or 4mm polypropylene housings.

These syringe filters are also made for laboratories that require consistent, high performance results with ease of use especially during high volume work. An excellent choice when laboratories cannot afford poor chromatographic results. 

Click HERE for More Information about AQ™ Syringe Filters.


The Selection "FILTER" buttons refine the Products displayed in the Ordering Chart. They are described below and listed alphabetically by FILTER.

  • 13mm Filters - Use when sample size is limited and residual volume must be minimized.

  • 25mm Filters - Standard size for Chromatography labs and our most popular size.

  • 4mm Filters - Used when sample size is under 1ml and residual volume must be minimized.

  • Cellulose Filters - Use with Aqueous solvents and when biological activity should be maintained.

  • Color - The outer ring of the filter has a color that corresponds to the pore size and membrane type: Black, Blue, Brown, Green, Grey, Natural, Orange, Pink, Purple, Red, White, White w/Black Letters, White w/Blue Letters, White w/Green Letters, White w/Red Letters or Yellow

  • High Throughput - Multiple membranes stack to "pre-filter" the largest undissolved particles for easier flow and greater throughput.

  • Miscellaneous - Glass fiber filter without an analytical membrane.

  • Nylon Filters - The most popular filters for HPLC and Dissolution Testing.

  • PES Filters - Polyethersulfone membranes. is one of the purest membranes on the market for use instead of Nylon. Chosen for ICP, ICP, ICP//MS and Proteins.

  • Pore Size: 0.22um, 0.45um, 1.0um. The Most Popular size is 0.45um.

  • PTFE Filters - Teflon membranes are considered Chemically Inert . Used when certain solvents or reagents will disrupt the membrane. Not recommended for aqueous solutions due to its hydrophobicity.

  • PVDF Filters - Used when analytes adsorb to Nylon. Low Protein binding.

  • Regenerated Cellulose Filters - Low protein binding and more rugged and robust than traditional cellulose membranes.

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