Syringe Filter

GDXFil Syringe Filter

GDXFil™ is a high-capacity syringe filter designed for samples with high particulate loads, such as environmental, industrial and complex biological matrices. It features a 25 mm pigment-free polypropylene housing with a four-layer membrane stack consisting of Microlab GMF 150 (graded density) and GF/F glass microfiber media. The filter is engineered as a direct replacement for Whatman's GDX syringe filter, offering improved durability and consistent performance in demanding filtration tasks.

Four-layer membrane stack with graded density media handles high particulate loads without rapid clogging
25 mm diameter housing provides 4.6 cm² filtration area for high-volume sample processing
Ultrasonic welding ensures a strong, leak-free seal without adhesive contamination
Pigment-free polypropylene housing reduces extractables in sensitive analytical workflows

Key Benefits

What This Product Gives You

Four-layer membrane stack with graded density media handles high particulate loads without rapid clogging
25 mm diameter housing provides 4.6 cm² filtration area for high-volume sample processing
Ultrasonic welding ensures a strong, leak-free seal without adhesive contamination
Pigment-free polypropylene housing reduces extractables in sensitive analytical workflows
Direct replacement for Whatman's GDX syringe filter, enabling method continuity without revalidation

Four-layer membrane stack with Microlab GMF 150 (graded density) and GF/F glass microfiber media
25 mm diameter housing with 4.6 cm² effective filtration area
Pore sizes of 0.22, 0.45, 0.70, 1.0 micron available across multiple membrane types
Ultrasonic welding for sealing, eliminating adhesive in the flow path
Female luer lock inlet and male luer slip outlet for standard syringe compatibility
Maximum operating pressure of 5.2 bar at 23 C
Pigment-free polypropylene housing to reduce extractables

Where It Is Used

Applications And Buyers

Application Scenarios

Filtering heavily particulate-laden environmental water samples before ICP-MS or AAS analysis
Processing industrial process streams with high suspended solids in chemical and petrochemical QC
Preparing crude biological extracts and cell lysates for downstream HPLC or mass spectrometry
Handling complex food and beverage matrices with high lipid or protein content
Supporting high-throughput sample preparation in pharmaceutical and environmental laboratories

Who It Is For

Environmental testing labs handling soil leachates, wastewater and sludge samples
Pharmaceutical R&D labs processing crude fermentation broths and cell culture harvests
Industrial QC labs analyzing process fluids with high particulate content
Contract testing labs requiring a reliable, high-capacity filter for variable sample matrices
Lab distributors seeking a direct replacement for Whatman GDX filters with consistent performance

Problems It Solves

Filters clogging too quickly when processing samples with high particulate content
Ghost peaks or baseline noise from extractables in multi-layer filters with adhesive bonding
Inconsistent performance when switching between different filter brands due to geometry or sealing differences
Lack of a robust filter for high-volume or dirty samples that can withstand repeated use
Difficulty sourcing a direct replacement for Whatman GDX filters without method revalidation

Data

Specifications

Filter Media	Nylon, PTFE, Hydrophilic PTFE, MCE, RC, CA, PES, PVDF, Hydrophilic PVDF, GF/F glass microfiber
Housing	PP
Diameter	25 mm
Filtration Area	4.6 cm²
Pore Size	0.22, 0.45, 0.70, 1.0 micron
Sealing Technology	Ultrasonic welding
Max Operating Pressure	5.2 bar at 23 C
Inlet / Outlet	Female luer lock / male luer slip
Packing	100 pcs per pack

Materials

Pigment-free polypropylene housing
Four-layer membrane stack: Microlab GMF 150 (graded density) and GF/F glass microfiber media
Membrane types: Nylon, PTFE, Hydrophilic PTFE, MCE, RC, CA, PES, PVDF, Hydrophilic PVDF

Customization Options

OEM printing and private-label packing available through the Microlab OEM division
OEM contract manufacturing and membrane die-cut and packing services offered
Custom membrane stack configurations possible for specific high-particulate applications

How It Is Made

Manufacturing And Quality Control

Manufacturing Process

Die-cutting of membrane layers to precise dimensions
Stacking of four layers with graded density media for high particulate retention
Ultrasonic welding of the membrane stack into the polypropylene housing
Inspection of seal integrity and membrane alignment
Printing of part number and membrane type on housing
Packing at 100 pieces per pack

Quality Control

Membrane layers inspected for uniformity and alignment before welding
Seal integrity tested under pressure to verify resistance to 5.2 bar at 23 C
Pore size and membrane type verified against the printed part number
Visual inspection of housing for pigment or defects

Comparison

Compared With The Alternatives

Versus Single-layer syringe filters

The four-layer stack in GDXFil™ provides significantly higher particulate capacity and longer service life when handling dirty samples, reducing the need for frequent filter changes.

Versus Solvent-bonded filters

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

Versus Whatman GDX syringe filter

GDXFil™ is engineered as a direct replacement, maintaining the same geometry and performance, enabling seamless method transfer without revalidation.

Versus Standard 25 mm filters with single membrane

The multi-layer design of GDXFil™ allows for higher throughput and longer run times on high-particulate samples, reducing downtime and consumable costs.

Use Guide

How To Use It

Select the membrane type based on sample chemistry: PTFE and PP for aggressive solvents, PES and MCE for aqueous samples, Nylon and RC for mixed phases
Choose 0.22 micron for sterile filtration or fine particulate removal, 0.45 micron for routine clean-up, and 0.70 or 1.0 micron for high-volume, high-particulate samples
Use the 25 mm diameter filter for sample volumes exceeding 5 mL or when high particulate load is expected
Attach the syringe to the female luer lock inlet, expel air, then apply steady pressure during filtration
If pressure increases rapidly, stop and replace the filter-do not exceed 5.2 bar at 23 C
Discard the first few drops if the method is sensitive to membrane wetting solvent

Photos

Product Gallery

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FAQ

Questions Buyers Ask

What is the difference between GDXFil™ and a standard syringe filter?

GDXFil™ has a four-layer membrane stack with graded density media, designed for high particulate loads, whereas standard filters use a single membrane and clog faster.

Can GDXFil™ replace Whatman's GDX syringe filter?

Yes. GDXFil™ is engineered as a direct replacement for Whatman's GDX syringe filter, with the same geometry and performance.

What pore sizes are available?

Available pore sizes are 0.22, 0.45, 0.70, and 1.0 micron across the range of membrane types.

What is the maximum operating pressure?

The maximum operating pressure is 5.2 bar at 23 C, achieved through ultrasonic welding of the seal.

How are the filters packed?

Each filter is packed in sets of 100 pieces per pack, with part number and membrane type printed on the housing.

Do you offer private-label options?

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