Syringe Filter

Bestfil Syringe Filter

Bestfil™ is a high-throughput syringe filter designed for routine sample preparation in HPLC, GC, and UV analysis. It features a 33 mm diameter housing made from MBS, offering a large filtration area of 5.3 cm² to handle high-volume or particle-laden samples without frequent replacement. The injection-moulded sealing ensures integrity under pressure, and the filter is available in both sterile and non-sterile forms. It is engineered as a direct replacement for Millipore's Millex syringe filters, maintaining compatibility with standard syringe fittings and lab workflows.

33 mm diameter provides 5.3 cm² filtration area, suitable for high-volume or high-particulate samples
Injection-moulded sealing withstands 87 psi (6.0 bar) at 20°C, preventing housing failure during high-pressure filtration
Available in both sterile and non-sterile formats to match lab-specific requirements
Direct replacement for Millipore Millex syringe filters, enabling method continuity without revalidation

Key Benefits

What This Product Gives You

33 mm diameter provides 5.3 cm² filtration area, suitable for high-volume or high-particulate samples
Injection-moulded sealing withstands 87 psi (6.0 bar) at 20°C, preventing housing failure during high-pressure filtration
Available in both sterile and non-sterile formats to match lab-specific requirements
Direct replacement for Millipore Millex syringe filters, enabling method continuity without revalidation
Automated assembly in a controlled environment ensures consistent quality and minimal contamination risk

33 mm diameter housing with 5.3 cm² effective filtration area
MBS housing material with injection-moulded sealing technology
Pore sizes from 0.1 to 5.0 micron, including 0.70 and 1.0 micron options
Available in sterile and non-sterile forms
Female luer lock inlet and male luer slip outlet for standard syringe compatibility
Maximum operating pressure of 87 psi (6.0 bar) at 20°C
Automated assembly in a controlled environment, no human contact during production

Where It Is Used

Applications And Buyers

Application Scenarios

Filtering large-volume pharmaceutical samples before HPLC injection
Preparing environmental and industrial water samples with high particulate loads
Handling viscous or protein-rich biological matrices in life-science research
Supporting high-throughput QC labs where filter change frequency impacts workflow
Replacing Millipore Millex filters in existing workflows without changing equipment or protocols

Who It Is For

Pharmaceutical and biotech labs requiring high-volume filtration with minimal downtime
Environmental testing labs processing large numbers of water and soil samples
Contract research organisations standardising on a single filter platform across multiple projects
Lab distributors seeking a cost-effective alternative to branded syringe filters with full compatibility
OEM partners needing a reliable base filter for private-label or co-branded consumables

Problems It Solves

Frequent filter changes due to small filtration area in standard 13 mm or 25 mm syringe filters
Filter housing bursting under pressure when handling viscous or high-particulate samples
Incompatibility with existing lab workflows when switching from Millipore Millex filters
Contamination risk from manual handling during filter assembly
Lack of sterile option in lower-cost syringe filters for sensitive analytical applications

Data

Specifications

Filter Media	Nylon, PTFE, Hydrophilic PTFE, MCE, RC, CA, PES, PVDF, Hydrophilic PVDF, PP, GF
Housing	MBS
Diameter	33 mm
Filtration Area	5.3 cm²
Pore Size	0.1, 0.22, 0.45, 0.70, 1.0, 3.0, 5.0 micron
Sealing Technology	Injection molding
Max Operating Pressure	87 psi (6.0 bar) at 20°C
Inlet / Outlet	Female luer lock / male luer slip
Packing	100 pcs per pack

Materials

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

Customization Options

OEM private-label printing and packing available through the Microlab OEM division
Custom membrane and pore size combinations can be arranged
Sterile and non-sterile variants available upon request
OEM contract manufacturing and membrane die-cut and packing services offered

How It Is Made

Manufacturing And Quality Control

Manufacturing Process

Automated membrane die-cutting
Injection moulding of MBS housing
Injection-moulded sealing of membrane into housing
Sterile or non-sterile packaging based on order
Final inspection and packing in 100-piece units

Quality Control

Membrane type and pore size verified against part number before assembly
Sealing integrity tested to 6.0 bar at 20°C
Visual inspection of housing and membrane alignment
Final check of packaging and labelling accuracy

Comparison

Compared With The Alternatives

Versus Standard 13 mm or 25 mm syringe filters

The 33 mm diameter and 5.3 cm² filtration area reduce clogging frequency and allow higher sample throughput without changing filters

Versus Solvent-bonded housings

Injection-moulded sealing eliminates adhesive in the flow path and maintains integrity under 6.0 bar pressure

Versus Millipore Millex syringe filters

Bestfil™ is specified as a direct replacement, so no method revalidation is required when switching

Versus Manual assembly filters

Automated production in a controlled environment reduces contamination risk and ensures consistent performance

Use Guide

How To Use It

Select 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 pore size: 0.22 micron for routine HPLC clean-up, 0.45 micron for general filtration, 0.70 and 1.0 micron for high-particulate samples
Use 33 mm size for sample volumes exceeding 5 mL or when particle load is high
Attach syringe to female luer lock inlet, expel air, then filter at a steady rate
Discard first few drops if method is sensitive to membrane wetting solvent
Do not exceed 6.0 bar at 20°C; if pressure rises rapidly, switch to a coarser pore size or larger diameter

Photos

Product Gallery

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How to Choose A Syringe Filter Membrane Syringe Filter Pore Size and Diameter Guide

FAQ

Questions Buyers Ask

Is Bestfil™ a direct replacement for Millipore Millex syringe filters?

Yes. Bestfil™ is engineered to be a direct replacement for Millipore Millex syringe filters in the same 33 mm diameter and with the same inlet/outlet connections.

What is the filtration area of the 33 mm filter?

The effective filtration area is 5.3 cm², which is significantly larger than standard 13 mm or 25 mm filters.

What is the maximum operating pressure?

The filter can withstand up to 87 psi (6.0 bar) at 20°C, thanks to the injection-moulded sealing.

Are sterile versions available?

Yes. Bestfil™ is available in both sterile and non-sterile forms to meet different lab requirements.

Can I get these filters with my own brand label?

Yes. The Microlab OEM division offers private-label printing and packing for customers who need branded filters.

How are the filters packed?

Standard packing is 100 pieces per pack, with each housing clearly marked with membrane type and pore size.