Membrane Filter

PTFE Membrane Filter

PTFE membrane filters are designed for challenging sample matrices requiring high chemical resistance and low extractables. The hydrophobic version is ideal for air monitoring, solvent clarification, and aggressive chemical handling. The hydrophilic variant enables filtration of both aqueous and organic mixtures without pre-wetting. Both types are supported by a polypropylene net for improved handling and are available in disc, roll, sheet, strip, and customizable formats. The membranes are manufactured using a unique biaxial and uniaxial expansion process to achieve high porosity and strength.

Hydrophobic PTFE resists acids, bases, solvents, and propellants without degradation
Hydrophilic PTFE enables direct filtration of aqueous and mixed solvent solutions without pre-wetting
Polypropylene net support improves handling and reduces membrane tearing during use
High porosity and air permeability reduce filtration time for gas and volatile samples

Key Benefits

What This Product Gives You

Hydrophobic PTFE resists acids, bases, solvents, and propellants without degradation
Hydrophilic PTFE enables direct filtration of aqueous and mixed solvent solutions without pre-wetting
Polypropylene net support improves handling and reduces membrane tearing during use
High porosity and air permeability reduce filtration time for gas and volatile samples
Biaxial and uniaxial expansion process ensures consistent pore structure and lot-to-lot reproducibility

Manufactured using biaxial and uniaxial expansion of polytetrafluoroethylene (PTFE)
Supported by a polypropylene net on the underside for improved handling
Available in hydrophobic and hydrophilic variants for broad application coverage
High porosity and excellent air permeability reduce filtration time for gases and volatile liquids
Lot-to-lot consistency ensures reproducible results across batches
Maximum operating temperature of 100 C, pH range 1 to 14
Available in disc, roll, sheet, strip, and customizable formats

Where It Is Used

Applications And Buyers

Application Scenarios

Filtering aggressive solvents and reagents in pharmaceutical and chemical R&D
Clarifying hydraulic fluids and lubricants for contamination analysis
Air monitoring in industrial and environmental testing using hydrophobic PTFE
Isolating RNA from complex biological matrices with hydrophilic PTFE
Handling mixed aqueous and organic samples in method development and QC

Who It Is For

Pharmaceutical and chemical laboratories handling corrosive or volatile solvents
Environmental testing labs conducting air and fluid sampling in harsh conditions
Life-science labs requiring reliable RNA isolation with minimal sample loss
Contract testing organizations needing consistent performance across multiple sample types
OEM partners requiring customizable membrane formats and private-label packaging

Problems It Solves

Membrane degradation when filtering strong acids, bases, or aggressive solvents
Inconsistent filtration performance due to poor membrane integrity or handling
High resistance to flow when using membranes with low porosity or poor permeability
Need for pre-wetting hydrophobic membranes before aqueous sample filtration
Inability to handle mixed solvent and aqueous matrices with a single membrane type

Data

Specifications

Membrane Material	Polytetrafluoroethylene (PTFE) with PP layer
Color	White / Plain
Membrane Format	Disc, Roll, Sheet, Strip, Customizable
Thickness	160±10 μm
Max Operating Temperature	100 C
pH Range	1 to 14
Hydrophobic Pore Sizes	0.1, 0.22, 0.45, 1.0, 2.0, 3.0, 5.0 micron
Hydrophilic Pore Sizes	0.1, 0.22, 0.45, 1.0, 3.0, 5.0 micron
Alcohol Flow Rate (25°C, p=0.07MPa)	2 to 80 ml/min/cm²
Air Flow Rate (25°C, 0.01MPa)	≥150 to ≥1900 m³/m²/hr
Bubble Point (Hydrophobic)	≥0.015 to ≥0.15 bar
Bubble Point (Hydrophilic)	≥0.035 to ≥0.16 bar
Water Flow Rate (25°C, p=0.07MPa)	≥1.7 to ≥13.3 ml/min/cm²
Sterilization Compatibility	Autoclave, Ethylene Oxide, E-Beam, Gamma Irradiation

Materials

Polytetrafluoroethylene (PTFE) membrane with polypropylene (PP) net support
Hydrophobic PTFE for aggressive solvents and air monitoring
Hydrophilic PTFE for aqueous and mixed solvent applications

Customization Options

Custom membrane formats including disc, roll, sheet, strip, and bespoke shapes
Custom packaging quantities and labeling available
OEM private-label printing and packaging through Microlab OEM division
Custom pore sizes and dimensions available upon request

How It Is Made

Manufacturing And Quality Control

Manufacturing Process

Biaxial and uniaxial expansion of PTFE to create high-porosity structure
Lamination of polypropylene net to the underside for handling strength
Die-cutting of membranes into disc, roll, sheet, or strip formats
Quality inspection of pore size, thickness, and surface integrity
Packaging according to order specifications: 25 to 200 pieces per pack

Quality Control

Pore size verified against specified values for each part number
Membrane thickness measured to ensure 160±10 μm tolerance
Bubble point test conducted to confirm integrity and pore size
Visual inspection for defects, tears, or contamination
Lot-to-lot consistency verified through batch testing

Comparison

Compared With The Alternatives

Versus Standard PTFE membranes without PP support

The polypropylene net improves handling and reduces tearing during use, especially in roll and sheet formats.

Versus Hydrophobic membranes requiring pre-wetting

Hydrophilic PTFE eliminates the need for pre-wetting, enabling direct filtration of aqueous samples.

Versus Non-expanded PTFE membranes

The biaxial and uniaxial expansion process increases porosity and permeability, reducing filtration time.

Versus Multi-layer membranes

Single-layer PTFE construction minimizes extractables and maintains low background in analytical methods.

Use Guide

How To Use It

Select hydrophobic PTFE for air monitoring, solvent clarification, and aggressive chemicals
Choose hydrophilic PTFE for aqueous solutions, mixed solvents, or RNA isolation
Use 0.22 micron for particle retention in sensitive analytical applications
Use 0.45 micron for routine filtration of viscous or particle-laden samples
Handle roll and sheet formats carefully to avoid tearing; use the PP net as a guide
Sterilize using autoclave, E-Beam, gamma irradiation, or ethylene oxide as needed
Store in a dry, cool environment away from direct UV exposure

Photos

Product Gallery

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FAQ

Questions Buyers Ask

What is the difference between hydrophobic and hydrophilic PTFE?

Hydrophobic PTFE repels water and is used for air monitoring and solvent clarification. Hydrophilic PTFE is treated to attract water and can filter aqueous solutions directly without pre-wetting.

Can I use this membrane for RNA isolation?

Yes. The hydrophilic PTFE membrane is suitable for isolating RNA from biological samples due to its chemical resistance and low protein binding.

Are the membranes compatible with gamma irradiation?

Yes. Both hydrophobic and hydrophilic PTFE membranes are compatible with gamma irradiation for sterilization.

How are the membranes packaged?

Discs are packed in 25 to 200 pieces per pack depending on size. Rolls are supplied as single units per pack. Custom packaging is available.

Can I get custom sizes or shapes?

Yes. Custom formats including disc, roll, sheet, strip, and bespoke shapes are available through the OEM division.