Syringe Filter

DLLFil Syringe Filter

DLLFil™ Syringe Filter is designed for high-throughput sample filtration in analytical laboratories. The filter supports a range of common membrane types and is available in 0.22, 0.45, 0.70, and 1.0 micron pore sizes. Its single-layer membrane construction and ultrasonic welding sealing reduce extractables, helping maintain clean HPLC baselines. The design allows for both individual and assembled use, supporting efficient workflow in QC and R&D environments.

28 mm diameter housing provides 5 cm² filtration area, suitable for higher sample volumes and faster filtration rates
Double luer lock connections ensure secure attachment and prevent disconnection during high-pressure filtration
Ultrasonic welding sealing avoids adhesive contamination and maintains low extractables for sensitive HPLC and GC analysis
Available in nine membrane types including PTFE, PES, MCE, CA, PVDF, RC, and GF, covering aqueous, organic, and mixed solvent matrices

Key Benefits

What This Product Gives You

28 mm diameter housing provides 5 cm² filtration area, suitable for higher sample volumes and faster filtration rates
Double luer lock connections ensure secure attachment and prevent disconnection during high-pressure filtration
Ultrasonic welding sealing avoids adhesive contamination and maintains low extractables for sensitive HPLC and GC analysis
Available in nine membrane types including PTFE, PES, MCE, CA, PVDF, RC, and GF, covering aqueous, organic, and mixed solvent matrices
Replacement for Sartorius Minisart syringe filters, allowing method continuity without revalidation

Double luer lock inlet and outlet for secure, leak-free connections
Ultrasonic welding sealing technology for consistent integrity and low extractables
Available in 0.22, 0.45, 0.70, and 1.0 micron pore sizes across nine membrane types
Single-layer membrane construction reduces material contact and dissolution in the flow path
Maximum operating pressure of 6 bar at 23 C, suitable for viscous or particle-laden samples
Supports both individual and assembled configurations for flexible integration into workflows

Where It Is Used

Applications And Buyers

Application Scenarios

Filtering high-volume samples in pharmaceutical QC where throughput and consistency are critical
Preparing environmental and food samples with variable particle loads for chromatographic analysis
Handling aggressive solvents in chemical and petrochemical testing with strong chemical compatibility
Supporting life-science workflows requiring low extractables and minimal carry-over between samples
Using in automated systems where secure, repeatable connections are needed for reliable operation

Who It Is For

Pharmaceutical and biotech laboratories requiring high-throughput sample preparation with minimal contamination risk
Environmental and food testing labs processing large numbers of samples with diverse matrix types
Contract testing organizations standardizing on a single filter platform across multiple clients and instruments
Lab distributors sourcing a full membrane range in one consistent housing geometry
OEM partners needing a drop-in replacement for Sartorius Minisart filters with customizable branding

Problems It Solves

Sample loss or contamination due to loose or leaking connections during syringe filtration
Ghost peaks in HPLC runs caused by extractables from solvent-bonded or multi-layer filters
Frequent filter failure under pressure due to weak sealing technology
Inconsistent performance when switching between different membrane types with mismatched housing geometries
Need to source multiple filter types from different suppliers with varying packaging and validation histories

Data

Specifications

Filter Media	Nylon, PTFE, Hydrophilic PTFE, MCE, RC, CA, PES, PVDF, Hydrophilic PVDF, GF
Housing	PC
Diameter	28 mm
Filtration Area	5 cm²
Sealing Technology	Ultrasonic welding
Pore Size	0.22, 0.45, 0.70, 1.0 micron
Max Operating Pressure	6 bar at 23 C
Inlet / Outlet	Female luer lock / Male luer lock
Packing	100 pcs per pack

Materials

Membrane selected per application: Nylon, PTFE, Hydrophilic PTFE, MCE, RC, CA, PES, PVDF, Hydrophilic PVDF, GF

Customization Options

Choice of nine membrane types across 0.22 to 1.0 micron pore sizes
28 mm housing diameter with double luer lock connections
OEM printing and private-label packing through the Microlab OEM division
OEM contract manufacturing and membrane die-cut and packing for filter brands

How It Is Made

Manufacturing And Quality Control

Manufacturing Process

Membrane die cutting to precise dimensions
Ultrasonic welding of membrane into housing
Part number and membrane type printing on housing
Packing at 100 pieces per pack

Quality Control

Membrane and housing inspected before assembly
Sealing integrity tested against the 6 bar at 23 C operating limit
Pore size and membrane type verified against the printed part number
Visual inspection for defects in housing and weld seam

Comparison

Compared With The Alternatives

Versus Single luer lock syringe filters

Double luer lock connections provide greater stability and prevent disconnection during high-pressure or high-volume filtration, reducing the risk of sample loss or contamination.

Versus Solvent-bonded housings

Ultrasonic welding eliminates adhesive in the flow path, reducing extractables and improving compatibility with sensitive HPLC and GC methods.

Versus Sartorius Minisart syringe filters

DLLFil™ is specified as a direct replacement for Minisart filters, offering the same 28 mm diameter and double luer lock design without requiring method revalidation.

Versus Multi-layer membrane filters

Single-layer construction minimizes material contact and dissolution, which is critical for gradient HPLC and low-level residue analysis.

Use Guide

How To Use It

Select membrane based on sample chemistry: PTFE and PVDF for aggressive solvents, PES and MCE for aqueous samples, Nylon and RC for mixed phases
Use 0.22 micron for sterile filtration or ultrafine particulate removal, 0.45 micron for routine HPLC clean-up
Attach syringe to female luer lock inlet and tubing to male luer lock outlet; ensure both connections are fully seated
Apply steady pressure during filtration; if pressure rises rapidly, switch to a coarser pore size or larger diameter filter
Discard the first few drops if the method is sensitive to membrane wetting solvent
Do not exceed 6 bar at 23 C; use a larger diameter or coarser pore size if flow resistance increases

Photos

Product Gallery

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FAQ

Questions Buyers Ask

Which membrane should I use for organic solvent samples?

For organic solvents, use hydrophobic PTFE or hydrophobic PVDF membranes. These offer strong chemical resistance and low extractables.

What is the filtration area of the 28 mm filter?

The effective filtration area is 5 cm², which supports higher throughput and faster filtration compared to smaller diameters.

Can I use this filter with a 33 mm syringe?

The filter is designed for 28 mm syringe filters. It may not fit standard 33 mm syringes without an adapter or modification.

Is this filter compatible with Sartorius Minisart filters?

Yes. DLLFil™ is specified as a direct replacement for Sartorius Minisart syringe filters in the same 28 mm diameter and double luer lock configuration.

What is the maximum pressure rating?

Maximum operating pressure is 6 bar at 23 C. The ultrasonic welding sealing technology ensures integrity at this pressure.

Do you offer private-label packaging?

Yes. The Microlab OEM division provides OEM printing, private-label packing, and contract manufacturing for filter brands.