Membrane Filter

PP Membrane Filter

PP Membrane Filters are depth filters made from pure polypropylene microfiber, designed for pre-filtration in demanding analytical and industrial processes. They offer high dirt-holding capacity, excellent chemical resistance across pH 1-14, and thermal stability up to 80°C. The filters are hydrophobic, have low protein absorption, and are suitable for aqueous and organic solvent applications, including gas, ink, and water filtration. Available in disc, roll, sheet, strip, and customizable formats, they support a range of pore sizes from 0.1 to 10.0 micron.

Pure polypropylene construction ensures compatibility with aggressive solvents and a broad pH range from 1 to 14
Hydrophobic nature and low protein absorption make it suitable for gas and biological sample pre-filtration
High dirt-holding capacity reduces clogging during extended filtration of particulate-laden samples
Thermal stability up to 80°C allows use in high-temperature processes without degradation

Key Benefits

What This Product Gives You

Pure polypropylene construction ensures compatibility with aggressive solvents and a broad pH range from 1 to 14
Hydrophobic nature and low protein absorption make it suitable for gas and biological sample pre-filtration
High dirt-holding capacity reduces clogging during extended filtration of particulate-laden samples
Thermal stability up to 80°C allows use in high-temperature processes without degradation
Available in multiple formats including discs, rolls, sheets, strips, and custom shapes for flexible integration

Made from pure polypropylene microfiber with natural hydrophobic properties
Chemical compatibility across pH 1-14 and resistance to a wide range of organic solvents
Maximum operating temperature of 80°C without structural or functional degradation
Low protein absorption suitable for biological and pharmaceutical applications
High dirt-holding capacity for extended filtration runs before clogging occurs
Available in disc, roll, sheet, strip, and customizable formats for diverse application needs
Pore sizes from 0.1 to 10.0 micron to match particle size requirements
White plain surface with uniform membrane structure for consistent flow and filtration

Where It Is Used

Applications And Buyers

Application Scenarios

Pre-filtration of API intermediates and active pharmaceutical ingredients in pharmaceutical manufacturing
Gas filtration in industrial processes where solvent resistance and low extractables are required
Ink filtration in printing systems to prevent nozzle clogging and maintain print quality
Water purification systems requiring resistance to extreme pH and high particulate loads
Pre-treatment of aqueous and organic solvent samples before HPLC, GC, or mass spectrometry analysis

Who It Is For

Pharmaceutical and biotech labs requiring pre-filtration of sensitive compounds with minimal extractables
Industrial filtration teams handling aggressive solvents and wide pH ranges in process lines
Printing and coating manufacturers needing consistent ink filtration to avoid equipment damage
Water treatment facilities managing high-turbidity or chemically variable feed streams
Contract labs and OEMs needing customizable membrane formats for integrated filtration systems

Problems It Solves

Column or instrument blockage due to undetected particulates in pre-analytical samples
Filter degradation or failure when exposed to strong acids, bases, or organic solvents
Protein adsorption on filter surfaces leading to sample loss in biological workflows
Frequent filter changes caused by low dirt-holding capacity in high-load applications
Inconsistent filtration performance due to material incompatibility with process chemistry

Data

Specifications

Membrane Material	Polypropylene (PP)
Color	White / Plain
Membrane Format	Disc, Roll, Sheet, Strip, Customizable
Thickness	As per specification
Max Operating Temperature	80°C
pH Resistance	1-14
Flow Rate	25°C, p=0.07 MPa (ml/min/cm²)
Bubble Point	As per specification
Sterilization Compatibility	Autoclave, Ethylene Oxide, E-Beam, Gamma Irradiation

Materials

Pure polypropylene microfiber membrane
No additional binders or coatings specified

Customization Options

Custom membrane formats including discs, rolls, sheets, strips, and bespoke shapes
Custom pore size and diameter options available upon request
Private-label printing and packaging available through the Microlab OEM division
OEM contract manufacturing and membrane die-cutting services for filter brands

How It Is Made

Manufacturing And Quality Control

Manufacturing Process

Polypropylene microfiber production and membrane formation
Die-cutting of disc, sheet, strip, or roll formats
Customization of size and shape upon request
Quality inspection of membrane uniformity and surface integrity
Packing according to order specifications: 200 pcs/pk for discs, 1 roll/pk for rolls

Quality Control

Visual inspection of membrane surface for defects and uniformity
Verification of pore size and thickness against specified values
Testing of chemical resistance and thermal stability within stated limits
Validation of sterilization compatibility through process validation
Final inspection of packing and labeling accuracy before dispatch

Comparison

Compared With The Alternatives

Versus Cellulose Acetate (CA) Membranes

PP has superior chemical stability and higher temperature resistance compared to CA, which degrades at elevated temperatures

Versus Nylon Membranes

PP has lower protein absorption and better solvent resistance than nylon, making it more suitable for organic solvent and biological applications

Versus Multi-layer Depth Filters

PP single-layer depth filters offer consistent flow and predictable performance, while multi-layer builds may introduce additional extractables and variable flow dynamics

Use Guide

How To Use It

Select pore size based on particle size: 0.1-0.45 micron for fine particulates, 1.0-10.0 micron for coarse pre-filtration
Use 0.22 micron for sterile-grade applications or when removing bacteria-sized particles
Ensure the filter is compatible with the solvent or sample matrix, especially in extreme pH or high-temperature conditions
For roll formats, ensure the width and length match the filtration system's design requirements
Pre-wet the filter with a compatible solvent if required for gas or organic solvent filtration
Do not exceed 80°C during operation to prevent membrane deformation or failure
Sterilize using autoclave, ethylene oxide, E-beam, or gamma irradiation as per process needs

Photos

Product Gallery

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Membrane Filter Material Selection Guide

FAQ

Questions Buyers Ask

What is the maximum temperature this filter can withstand?

The PP membrane filter can withstand a maximum operating temperature of 80°C without degradation.

Is this filter compatible with strong acids and bases?

Yes, the polypropylene membrane is resistant to pH 1-14, making it suitable for both acidic and alkaline applications.

Can I use this filter for gas filtration?

Yes, the hydrophobic nature and chemical stability of PP make it suitable for gas filtration applications.

What are the available formats?

Available in disc, roll, sheet, strip, and customizable formats depending on the order.

How are the filters packed?

Discs are packed at 200 pieces per pack for smaller diameters and 100 or 50 pieces per pack for larger sizes. Rolls are packed at 1 roll per pack.

Can you provide private-label packaging?

Yes, the Microlab OEM division offers private-label printing and packing for filter brands and distributors.