STRING WOUND FILTER CARTRIDGES

Reliable Depth Filtration for a Wide Range of Liquids
Ecofiltrone string wound filter cartridges are manufactured with premium yarns and robust center cores to deliver high dirt-holding capacity, stable performance and long service life in industrial filtration systems.

✓ PP, Cotton and Glass Fiber Yarn Options
✓ Multiple Micron Ratings from 1 to 100 μm
✓ PP and Stainless Steel Core Options
✓ Standard Lengths from 5″ to 50″
✓ Suitable for Water, Oil, Chemical and More

How to Choose the Right String Wound Filter Cartridge

PP String Wound Filter Cartridges

Polypropylene yarn for water, acids, alkalis and general chemical applications.

Cotton String Wound Filter Cartridges

Cotton yarn for oils, edible oils, paints, coatings and food & beverage applications.

Glass Fiber String Wound Cartridges

Glass fiber yarn for high-temperature, oils, fuels and demanding chemical applications.

Select by Yarn Material

Selection Factor	PP Yarn	Cotton Yarn	Glass Fiber Yarn
Main Advantage	Broad chemical compatibility	Good adsorption & economical	High temperature resistance
Typical Liquids	Water, acids, alkalis, chemicals	Oils, water-based liquids, beverages	Oils, fuels, solvents, hot liquids
Typical Core	PP / SS	SS / PP	SS
Temperature Capability	Depends on core and system	Moderate	Higher
Typical Application	Water & chemical filtration	Oil & food-related filtration	Petrochemical & high-temp filtration

Material selection should be confirmed according to liquid composition, concentration, temperature and exposure time.

String Wound vs Melt Blown Filter Cartridg

String wound and melt blown cartridges are both depth filter cartridges, but they are designed for different operating conditions.

Factor	String Wound Filter Cartridge	Melt Blown Filter Cartridge
Structure	Yarn wound around a core	Thermally bonded PP fibers
Filtration Type	Depth filtration	Depth filtration
Best For	High dirt load or challenging fluids	General particle removal
Dirt Holding Capacity	High	Good
Material Options	PP, cotton, glass fiber and more	Mainly polypropylene
Mechanical Strength	Strong core-supported structure	Self-bonded fiber structure
Typical Use	Seawater, chemicals, oil, process fluids	Water treatment, RO pretreatment
Cost	Moderate	Economical

Why use String Wound Filters?

Gradient Depth Filtration

Captures contaminants throughout multiple layers.

High Dirt-Holding Capacity

Retains more particles and extends service life.

Flexible Material Selection

PP, cotton and glass fiber for different liquids and conditions.

Wide Micron Range

Multiple nominal ratings for coarse to fine filtration.

Cost-Effective Prefiltration

Protects downstream filters and equipment.

Applications

Industrial Water Treatment

Remove rust, sand, suspended solids and process particles.

Seawater Desalination Pretreatment

Protect RO membranes and extend system lifetime.
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Chemical Processing

Filtration of acids, alkalis, solvents and chemicals.

Food & Beverage

Clarification and particle removal for compatible liquids.

Power Plant & Process Water

Prefiltration for cooling water, boiler feed water and more.View More>>

Oil & Lubricant Filtration

Remove particles from lube oil, hydraulic oil and more.

Size，Micron Ratings & Core Options

Avaliable Lengths

Micron Ratings(Nominal)

1um
2um
3um
5um
10um

20um
30um
50um
75um
100um

End Connection

DOE – Double Open End
Open-end with gasket options
Customized configurations

Outside and inside diameters are available according to standard housing dimensions or customer drawings.

Selection Guide

①

Confirm the Liquid
Identify liquid type and properties.

②

Identify the Contaminants
Confirm particle type, size and loading.

③

Select the Yarn Material
Choose PP, cotton or glass fiber appropriately.

④

Select the Micron Rating
Select nominal rating based on filtration needs.

⑤

Confirm the Core Material
Choose core based on temperature and compatibility.

⑥

Confirm Dimensions
Confirm length, OD, ID and housing fit.

⑦

Review Operating Conditions
Confirm flow, temperature, pressure and differential-pressure limits.

Common Problems

Gradient Depth Filtration

Captures contaminants throughout multiple layers.

Short Service Life

Incorrect yarn density or unsuitable material selection.

Yarn Loosening or Fiber Release

Poor winding tension or unstable yarn quality.

Cartridge Collapse or Deformation

Unsuitable core or excessive differential pressure.

Incorrect Filtration Performance

Different winding density may cause performance variation.

Chemical Compatibility Failure

Yarn or core may degrade in incompatible liquids.

Incorrect Size or Core Diameter

Mismatch in length, OD or ID affects installation.

FAQ

What is a string wound filter cartridge?

A string wound filter cartridge is a depth filter made by winding yarn around a center core in a controlled pattern. The winding structure captures particles throughout multiple media layers.

What is the difference between PP, cotton and glass fiber yarn?

PP is commonly used for water, acids and alkalis. Cotton is often selected for oils and compatible food or process liquids. Glass fiber is generally used for higher-temperature oils, fuels and demanding chemical applications.

Are string wound cartridges nominal or absolute rated?

Most string wound filter cartridges are nominally rated. Actual retention performance depends on yarn material, winding density, flow rate and test method.

How do I select the correct core material?

Core material should be selected according to liquid compatibility, operating temperature, pressure and housing requirements.

What lengths are available?

Common lengths include 5, 10, 20, 30, 40 and 50 inches. Customized lengths may also be available.

What information is required for quotation?

Please provide yarn material, core material, micron rating, length, outside diameter, inside diameter, liquid type, operating temperature, pressure and required quantity.

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