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
String Wound Filter Cartridge Types
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.
Yarn & Core Compatibility
Yarn Materials
- Polypropylene yarn
- Degreased cotton yarn
- Glass fiber yarn
- Polyester yarn
(subject to availability)
Core Materials
- Polypropylene core
- Stainless steel core
- Tin-plated steel core
- Customized core materials
The center core supports the cartridge under flow, temperature and differential-pressure conditions. Core selection should be based on liquid compatibility, operating temperature and housing structure.
⚠ A cartridge without a suitable center core may deform or collapse under excessive differential pressure.
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.
RO Pretreatment
Protect RO membranes and extend system lifetime.
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.
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.
NEED HELP SELECTING A STRING WOUND FILTER CARTRIDGE?
Send us your liquid type, contaminant information, required micron rating, yarn material, core material, cartridge dimensions, operating conditions and quantity. We will recommend the best solution for you.
Application
Liquid Type
Contaminant Type
Micron Rating
Yarn Material
Core Material
Length (inch)
OD / ID (mm)
Temperature
Pressure
Quantity
Existing Model / Photo
Other Requirements