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Industrial Filtration Products

String Wound Cartridge Filter

String wound cartridge filters provide true depth filtration with structured open outer layers and tightly wound inner layers, delivering high dirt holding capacity and minimal media migration. Designed for industrial applications, they offer exceptional structural strength to withstand higher PSID and severe operating conditions. Available in multiple media types, core materials, and length options, they are suitable for oil, chemical, plating, mining, and industrial water treatment processes.

True depth filtration with structured outer and inner layers maximises dirt holding capacity
Exceptional structural strength allows operation under higher PSID and severe conditions
Minimal media migration due to tightly wound construction and secure sealing
Multiple media and core options allow selection based on chemical compatibility and temperature

Key Benefits

What This Product Gives You

True depth filtration with structured outer and inner layers maximises dirt holding capacity
Exceptional structural strength allows operation under higher PSID and severe conditions
Minimal media migration due to tightly wound construction and secure sealing
Multiple media and core options allow selection based on chemical compatibility and temperature
Available in 10″, 20″, 30″, and 40″ lengths to match system requirements
End cap and seal material options support compatibility with various process fluids

Outer diameter options: 69 mm, 115 mm
Inner diameter options: Φ 28 mm, Φ 30 mm
Length options: 10″ (254 mm), 20″ (508 mm), 30″ (762 mm), 40″ (1016 mm)
Media options: Polypropylene, Bleached cotton, Glass fiber
Core options: PP, Stainless Steel
Maximum operating temperature: 80°C (PP), 120°C (Bleached cotton), 200°C (Glass fiber)
Maximum operating differential pressure: 2.0 bar at 25°C
End cap types: DOE, 222/Flat, 222/Fin, 226/Flat, 226/Fin
Seal materials: Silicone, EPDM, NBR, Viton
Removal ratings: 1 μm, 5 μm, 10 μm, 20 μm, 50 μm, 75 μm, 100 μm

Where It Is Used

Applications And Buyers

Application Scenarios

Filtration of oily and chemical process streams in industrial manufacturing
Pre-treatment of water in mining and plating operations to remove particulates
Protection of downstream equipment in machinery and equipment systems
Removal of fine particulates from industrial water before reuse or discharge
Handling of aggressive fluids in chemical processing where high temperature resistance is required

Who It Is For

Industrial filtration engineers managing high-volume process streams with variable particulate loads
Water treatment plant operators requiring durable filters for continuous operation
Manufacturers in oil, chemical, and plating industries seeking reliable pre-filtration
Process engineers specifying filters for systems with high pressure or temperature demands
OEMs integrating cartridge filters into larger filtration systems for industrial use

Problems It Solves

Clogged filters due to low dirt holding capacity in surface filters
Media shedding from loose or poorly wound filters causing downstream contamination
Filter failure under high pressure or high PSID due to weak structural integrity
Incompatibility with aggressive chemicals or high-temperature fluids
Lack of flexibility in filter geometry and material selection across different process stages

Data

Specifications

Outer Diameter	69 mm, 115 mm
Inner Diameter	Φ 28 mm, Φ 30 mm
Length	10″ (254 mm), 20″ (508 mm), 30″ (762 mm), 40″ (1016 mm)
Media	Polypropylene, Bleached cotton, Glass fiber
Core	PP, Stainless Steel
Max Operating Temperature	80°C (PP), 120°C (Bleached cotton), 200°C (Glass fiber)
Max Operating DP	2.0 bar at 25°C
Removal Rating	1 μm, 5 μm, 10 μm, 20 μm, 50 μm, 75 μm, 100 μm
End Cap Type	F=DOE, M=222/Flat, P=222/Fin, T=226/Flat, Q=226/Fin
Seal Material	S=Silicone, E=EPDM, B=NBR, V=Viton
Core Material	P=PP core, S=SS core

Materials

Polypropylene media and core
Bleached cotton media with PP or stainless steel core
Glass fiber media with stainless steel core
Silicone, EPDM, NBR, or Viton seals
Stainless steel end caps and core

Customization Options

Choice of media: Polypropylene, Bleached cotton, Glass fiber
Core selection: PP or Stainless Steel
End cap type: DOE, 222/Flat, 222/Fin, 226/Flat, 226/Fin
Seal material: Silicone, EPDM, NBR, Viton
Removal rating: 1 μm to 100 μm
Length: 10″, 20″, 30″, 40″
OEM packaging and labelling available through the Microlab OEM division

How It Is Made

Manufacturing And Quality Control

Manufacturing Process

Winding of string media in structured outer and tight inner layers
Insertion of core (PP or stainless steel) into the wound media
Assembly of end caps and sealing with specified seal material
Inspection of structural integrity and seal alignment
Final packaging for industrial shipment

Quality Control

Visual inspection of wound media for uniformity and defects
Seal integrity tested under operating pressure conditions
Core and end cap alignment verified before final assembly
Removal rating confirmed against specified micron size
Temperature and pressure performance tested to meet stated limits

Comparison

Compared With The Alternatives

Versus Surface filters

String wound filters offer true depth filtration with higher dirt holding capacity and longer service life compared to surface filters that clog quickly.

Versus Melt-blown filters

String wound filters have better structural strength and higher PSID tolerance than melt-blown filters, which can collapse under pressure.

Versus Pleated filters

String wound filters provide deeper filtration with less media migration and are more cost-effective for high-volume, high-dirt applications.

Versus Disposable cartridge filters with loose media

The structured winding in string wound filters reduces media migration and ensures consistent performance over time.

Use Guide

How To Use It

Select media based on chemical compatibility: Polypropylene for general use, Bleached cotton for higher temperature, Glass fiber for high-temperature and aggressive fluids
Choose core material based on system requirements: PP for chemical resistance, Stainless Steel for strength and durability
Match removal rating to the particle size of concern: 1 μm for fine particles, 100 μm for coarse particulates
Ensure end cap and seal material are compatible with process fluid and temperature
Verify length and diameter fit the housing or system specifications
Do not exceed 2.0 bar at 25°C or the maximum temperature rating of the selected media

FAQ

Questions Buyers Ask

What is the maximum operating pressure for this filter?

Maximum operating differential pressure is 2.0 bar at 25°C. The structural strength of the wound design supports higher PSID under normal conditions.

Which media is best for high-temperature applications?

Glass fiber media can withstand up to 200°C, making it suitable for high-temperature processes. Bleached cotton supports up to 120°C.

Can I use this filter with aggressive chemicals?

Yes, Polypropylene media and PP core are resistant to many chemicals. For stronger compatibility, use stainless steel core with appropriate seal material.

What end cap types are available?

Available end cap types are DOE, 222/Flat, 222/Fin, 226/Flat, and 226/Fin. Choose based on system compatibility and flow direction.

How do I select the right removal rating?

Select based on the particle size you need to remove. 1 μm for fine particles, 100 μm for coarse particulates. Higher ratings allow more flow but capture larger particles.

Do you offer OEM or private-label options?

Yes. The Microlab OEM division supports custom packaging, labelling, and private-label manufacturing for industrial filter brands.