String-Wound Cartridge Filter: 8 Media, 0.8–150 µm

Name: String-Wound Cartridge Filter
Brand: Prosestim

Industrial String-Wound Cartridge Filters in 8 Raw Materials, from Polypropylene to Glass Fibre

The string-wound cartridge filter is a depth filter made by cross-winding yarn onto a PP or stainless steel core. With 8 media, 0.8–150 µm, 5″–60″ lengths and DOE/SOE end options, there are hundreds of thousands of possible configurations.

Filter Media

8 Media Types

Wide Micron Range

0.8–150 µm

Wide pH compatibility

1-14

Certificate No: 06009/PR09U

ISO 9001:2015

String-Wound Cartridge Filter

Product Identity and Technical Summary Panel

The string-wound cartridge filter is a depth filter with high dirt-holding capacity made from pure yarn wound in a criss-cross diamond pattern onto a PP or stainless steel centre core. As the fluid moves from the outer surface of the cartridge towards the core, particles are left not at the surface but within the winding layers. It therefore has a wide range of uses, from pre-filtration to fine filtration, for separating sand, rust, sediment and other solids on water, chemical solution, oil and solvent lines.

Micron ratings from 0.8 µm to 150 µm, combined with eight media options (polypropylene, glass fibre, natural and bleached cotton, nylon, polyester, acrylic, viscose), suit food, pharmaceutical, energy and chemical processes. Because the cartridges are made in lengths from 5″ to 60″, with DOE or SOE end types and 215, 222 or 226 O-ring options, they can be configured to suit your existing filter housing.

The right cartridge is not chosen by micron rating alone. The media must be matched to the chemical nature and temperature of the fluid, the core material to the pressure conditions, and the gasket to fluid compatibility and sealing. When this match is right, the cartridge maintains its target micron performance and differential pressure rises slowly.

Horizontal view of a string-wound cartridge filter with both ends open (DOE) — String-Wound Cartridge Filter DOE

String-wound cartridge filter with silicone gaskets (DOE) — String-Wound Cartridge Filter DOE with Gasket

String-wound cartridge filter with stainless steel core and both ends open (DOE) — String-Wound Cartridge Filter – SS Housing DOE

Large-diameter Big string-wound cartridge filter with polypropylene core — String-Wound Cartridge Filter Big PP Housing

String-wound cartridge filter with silicone gasket open end and flat end cap — String-Wound Cartridge Filter Gasket + Flat Cap

String-wound cartridge filter with 215 O-ring and flat end cap — String-Wound Cartridge Filter – 215 O-Ring + Flat Cap

String-wound cartridge filter with 215 O-ring and Fin 1 end cap — String-Wound Cartridge Filter – 215 O-Ring + Fin 1 Cap

String-wound cartridge filter with 215 O-ring and Fin 2 end cap — String-Wound Cartridge Filter – 215 O-Ring + Fin 2

String-wound cartridge filter with 222 O-ring and flat end cap — String-Wound Cartridge Filter – 222 O-Ring + Flat Cap

String-wound cartridge filter with 222 long O-ring and flat end cap — String-Wound Cartridge Filter – 222 Long O-Ring + Flat Cap

String-wound cartridge filter with 222 long O-ring and Fin 1 end cap — String-Wound Cartridge Filter – 222 Long O-Ring + Fin 1

String-wound cartridge filter with 222 long O-ring and Fin 2 end cap — String-Wound Cartridge Filter – 222 Long O-Ring + Fin 2 Cap

String-wound cartridge filter with 226 O-ring and Fin 1 end cap — String-Wound Cartridge Filter – 226 O-Ring + Fin 1 Cap

Key Technical and Structural Features

Filter Media: Polypropylene (PP)
Polyester (PE)
Natural Cotton & Bleached Cotton
Glass Fibre (GF)
Nylon (PA)
Acrylic & Viscose
Filter Lengths: 5" (127 mm)
10" (254 mm)
20" (508 mm)
30" (762 mm)
40" (1016 mm)
50" (1270 mm)
60" (1524 mm)
Custom Process Lengths
Filtration Range: Fine graded-depth particle retention range of 0.8 µm – 150 µm.
Operating Compatibility: Food and Beverage Processes
Pharmaceutical and Chemical Industry
Power Generation Plants
Water and Industrial Liquid Lines
Construction Type: Polypropylene (PP) Centre Core
Stainless Steel (AISI 304 / 316) Core
Graded-Density Criss-Cross Diamond Winding
Connection Options: DOE (Double Open End)
SOE (Single Open End)
215 / 222 / 226 O-Ring
Flat / Fin 1 / Fin 2 End Cap
Production Model: Standard series production, with configurations tailored to process samples and technical drawings.
Quality Control: Post-production verification of appearance, dimensional tolerances and micron accuracy.

Water Flow Rate Performance

Thanks to its graded pore structure and cross-winding geometry, the string-wound cartridge filter offers water flow performance optimised for different micron ratings. Thanks to its high dirt-holding capacity, differential pressure rises slowly and linearly even as the particle load increases; there is no sudden clogging. This design creates a clear operational advantage in industrial applications in terms of long filter change intervals, low operating costs and stable filtration in high-flow processes. The test data show the pressure-flow relationship that varies with micron grade.

Performance Advantages in Water Filtration

Liquid Flow Performance per 10"

Pressure Values: Chart Data Points Per 10″ cartridge · chart measurement points

#	1 µm	5 µm	10 µm

Values per 10-inch cartridge · PP string-wound media · clean water

Graded Pore Structure and Working Principle

The main source of performance of Prosestim string-wound filters is “graded pore structure” technology. Yarn is wound layer by layer onto a PP or SS centre core with a controlled winding angle and variable winding density. As the fluid moves from the outer surface of the filter to the inner core, each layer traps particles of its own size. This structure prevents surface clogging and keeps the filter’s entire volume active.

STEP 01

Graded Pore Structure

The yarn is wound onto the centre core with a density that is tight on the inside and looser towards the outside. Thanks to this grading, the outer layers retain coarse particles and the inner layers finer ones. Retention therefore takes place not at the surface but across the full thickness of the filter; the contaminant load is spread through the entire depth instead of building up in one layer.

PROCESS BENEFIT A wide range of particle sizes is retained in a single cartridge, reducing the need for a pre-filter. Because the contaminant load is spread through the entire depth, surface clogging starts late; high retention capacity, low differential pressure, a longer service life and less frequent cartridge changes are achieved. Process continuity is maintained.

STEP 02

Cross-Winding Geometry

The yarn is wound not in straight parallel lines but at a controlled cross angle. Each layer crosses the gaps in the layer below, preventing direct flow channels from forming and forcing the fluid to follow a tortuous path. The winding angle, layer spacing and yarn tension are the main production parameters that determine the cartridge’s nominal micron rating.

PROCESS BENEFIT The cross geometry locks particles mechanically between the layers; depth filtration takes place and fibre migration stays low. Because the winding parameters are controlled, different micron ratings can be produced repeatably, performance variation is reduced and retention performance is maintained.

STEP 03

Centre Core Strength

The centre core, known in industry literature as the “center core”, is the structural skeleton of the string-wound cartridge. The yarn is wound onto this rigid structure, made of PP or stainless steel. Under high differential pressure and sudden flow changes, the geometric integrity of the core stops the winding layers collapsing inwards.

PROCESS BENEFIT Because the winding layers do not collapse under pressure, filtration depth and the nominal retention value are maintained throughout the service life; the cartridge does not deform, no flow channel opens and the risk of contaminant bypass is reduced. The core and yarns are chosen according to conditions for filtration at high temperatures or in chemical environments.

8 Raw Materials and Structural Engineering Design

Prosestim string-wound cartridge filters are industrial depth filtration elements made from 8 different raw materials. Polypropylene, glass fibre, natural cotton, bleached cotton, nylon, polyester, acrylic and viscose media options allow process-specific configurations for different chemical environments, temperature ranges and particle loads.

Each medium, made from pure yarn free of adhesives and resins, is wound layer by layer onto a PP or SS centre core with a controlled winding angle and variable winding density. This production geometry directly determines the filter’s nominal micron rating and contaminant-holding capacity.

The graded pore structure, created by winding density that increases from outside to inside, effectively removes a wide range of particle sizes in a single pass. The outer layers retain large particles and the inner layers smaller ones. The filter works actively throughout its entire volume; there is no early surface clogging. High contaminant-holding capacity, a linear pressure rise and a long service life are achieved together.

Parameter	Value
Filter Media	Polypropylene, natural cotton, bleached cotton, glass fibre, nylon, polyester, acrylic, viscose
Micron Ratings	0.8 µm (natural cotton), 1 µm, 3 µm, 5 µm, 10 µm, 15 µm, 20 µm, 25 µm, 30 µm, 35 µm, 40 µm, 45 µm, 50 µm, 55 µm, 60 µm, 65 µm, 70 µm, 75 µm, 80 µm, 85 µm, 90 µm, 95 µm, 100 µm, 150 µm
Inner Support Layer	PP core (polypropylene), SS core (stainless steel)
O-Ring Gasket	Silicone, nitrile, EPDM, Viton, Teflon
End Cap Type	DOE, SOE
Outer Diameter (Standard)	58 mm ±1
Outer Diameter (Big Blue)	107 mm ±1
Inner Diameter	28 mm ±1 (same for PP and SS cores)
Length	5″, 10″, 20″, 30″, 40″, 50″, 60″

Physical Construction and Effective Surface Area

String-wound filter cartridges with a 58 mm outer diameter offer a filtration surface area of 0.046 m² (0.498 ft²) in the 10-inch (254 mm) standard, according to the formula π × OD × length. Surface area grows linearly with length; in the 40-inch model this reaches 0.185 m² (1.993 ft²).

Thanks to the layered depth winding, the outer layers capture coarse particles and the inner layers finer ones. This graded pore structure increases contaminant-holding capacity per unit surface and extends filter life. The one-piece, continuous body from 5 to 60 inches reduces the risk of bypass and lowers pressure loss in high-flow processes.

Length	Surface Area (m²)	Surface Area (ft²)
5 inch	0,023 m²	0.249 ft²
10 inch	0,046 m²	0.498 ft²
20 inch	0,093 m²	0.997 ft²
30 inch	0,139 m²	1.495 ft²
40 inch	0,185 m²	1.993 ft²
50 inch	0,231 m²	2.491 ft²
60 inch	0,278 m²	2.989 ft²

Filter Material Chemical Compatibility Guide

String-wound cartridge filters are made from 8 different raw materials. The matrix below shows the resistance profile of each media for 13 chemical groups, including water-based chemicals, acids, bases, organic solvents and oils, in a single table. Choosing the right media is critical for production safety and filter life.

E: Excellent · G: Good · F: Fair · P: Poor · N/R: Not recommended

Resistance to Water-Based and Inorganic Process Chemicals

Chemical Group	Example Chemical	PP	Bleached Cotton	Nat. Cotton	Glass Fibre	Nylon	Polyester	Acrylic	Viscose
Water and Potable Liquids	Process water, RO pre-filtration, condensate	E	E	E	G	G	G	G	G
Dilute Inorganic Acids	HCl, H₂SO₄ (<30%)	E	F	F	E	P	G	E	F
Strong Inorganic Acids	H₂SO₄ (>70%), HCl (Fuming)	P	N/R	N/R	E	N/R	F	G	P
Weak / Organic Acids	Acetic Acid, Citric Acid, Formic Acid	E	G	G	E	F	G	G	G
Alkalis (Strong Bases)	NaOH, KOH, Ammonia	E	G	G	P	E	N/R	F	G
Oxidising Agents	H₂O₂, Sodium Hypochlorite, Ozonated Water	P	F	F	E	F	G	G	F
Microorganism Resistance	Bacteria, Fungi and Biofilm Formation	E	P	P	E	E	E	E	P

E: Excellent · G: Good · F: Fair · P: Poor · N/R: Not recommended

Resistance in Organic Solvent and Hydrocarbon Environments

Chemical Group	Example Chemical	PP	Bleached Cotton	Nat. Cotton	Glass Fibre	Nylon	Polyester	Acrylic	Viscose
Alcohols	Ethanol, Methanol, IPA	E	E	E	E	E	E	E	E
Ketones and Esters	Acetone, MEK, Ethyl Acetate	G	E	E	E	E	G	G	E
Aliphatic Hydrocarbons	Hexane, Heptane, Naphtha	G	E	E	E	E	E	E	E
Aromatic Hydrocarbons	Toluene, Xylene, Benzene	F	E	E	E	E	G	G	E
Chlorinated Solvents	Dichloromethane, Trichloroethylene	P	E	E	E	G	F	G	E
Mineral and Vegetable Oils	Hydraulic Oil, Machine Oil, Vegetable Oil	F	E	E	E	E	G	G	E

Operating Conditions

The performance of filter cartridges depends not only on filtration precision but also directly on their ability to suit process conditions. Operating temperature, pressure level, the chemical nature of the fluid and operating time are the key parameters affecting filter life, system efficiency and filtration continuity. Temperature resistance and chemical compatibility, which vary by media type, enable reliable and sustainable performance in different industrial applications.

Nominal Temperature: PP: 60 °C (140 °F)
Max. Temperature: PP Media: 80 °C (176 °F)
Max. Temperature: Cotton / Viscose: 120–160 °C
Max. Temperature: Nylon / Polyester: 121 °C (250 °F)
Max. Temperature: Glass Fibre: 399 °C (750 °F): with SS core
Max. ΔP: Normal Flow: 2.5 bar @ 30 °C
Max. ΔP: Reverse Flow: 2.1 bar @ 25 °C
Recommended Replacement ΔP: 2.0–2.4 bar
pH Compatibility: 1–14

Sealing and Connection Components

In string-wound filter cartridges, filtration performance is determined not only by winding density; the sealing interface that connects the cartridge to the housing is at least as decisive. The smallest gap between the cartridge end cap and the housing seating surface becomes a bypass line, and fluid passing through it reaches the clean side without ever touching the media. That is why a 1-micron cartridge with an unsuitable gasket can behave in the field like a much coarser cartridge.

End Caps and Closures

Prosestim string-wound cartridge filters are made with a wide range of adapter and end type options to fit different filter housings perfectly. With DOE and SOE end types, 215/222/226 adapter standards and flat/Fin 1/Fin 2 geometries, they are compatible with common filter housing brands.

Engineering Advantage for Process Safety

String-wound cartridge filter with silicone gaskets at both ends (DOE) — String-Wound Cartridge Filter DOE with Gasket

Big string-wound cartridge filter — String-Wound Cartridge Filter Big

String-wound cartridge filter with one end closed (SOE) — String-Wound Cartridge Filter SOE

String-wound cartridge filter with 215 O-ring and one end closed (SOE) — String-Wound Cartridge Filter 215 O-Ring SOE

String-wound cartridge filter with 222 O-ring and one end closed (SOE) — String-Wound Cartridge Filter SOE 222 O-Ring

String-wound cartridge filter with 222 O-ring and Fin 1 end cap — String-Wound Cartridge Filter 222 O-Ring Fin 1

String-wound cartridge filter with 222 long O-ring — String-Wound Cartridge Filter 222 Long O-Ring

String-wound cartridge filter with 226 O-ring and one end closed (SOE) — String-Wound Cartridge Filter SOE 226 O-Ring

String-wound cartridge with 226 O-ring and Fin 2 end cap — String-Wound Cartridge Filter 226 O-Ring and Fin 2

Polypropylene (PP) Core

Stainless Steel (SS) Core

O-rings

In Prosestim production, all O-ring types are chosen according to the chemical and thermal conditions of your process and supplied with the cartridge.

High-Performance O-Ring Solutions for Process Safety

Material Structure Suited to Chemical Environments
High Pressure and Temperature Stability
Precise Tolerances and Reliable Sealing
Long-Lasting, Durable Elastomer Performance
Integration Compatible with All Filter Systems

Gaskets

To guarantee the sealing performance of the cartridge filter, Prosestim offers gasket solutions suited to every media and application combination.

Gasket Solutions That Safeguard Filtration Efficiency

Material Selection to Process Specifications
Design Resistant to Thermal Shock and High Heat
Micron-Precise Tolerances That Prevent Bypass
Elastic Memory Developed Against Mechanical Fatigue
Ergonomic Cross-Section for Easy Installation and Removal

NBR / EPDM flat gasket — NBR / EPDM Gasket

Teflon (PTFE) flat gasket — Teflon Gasket

Green Viton flat gasket — Green Viton Gasket

Brown Viton flat gasket — Brown Viton Gasket

Industry Applications

Filter cartridges suited to different process needs are used across a wide range of industrial applications to protect product quality, safeguard equipment and support production continuity.

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20 Printing and Ink Flawless color and print quality in printing and ink. Explore solutions

21 Recycling Filtration for efficiency and environmental compliance in recycling. Explore solutions

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TECHNICAL ASSESSMENT BASED ON FIELD EXPERIENCE

Engineer's Note

This filter is designed to stand out with a long service life, especially with fluids carrying a high dirt load. The mistake we see most often in the field is running the media above its temperature limits. For processes above 80 °C with PP media, we recommend switching to bleached cotton or glass fibre media. Another common mistake is continuing to use the filter without checking the pressure difference. For ideal efficiency, we recommend that system flow does not exceed 75% of the unit’s capacity.

When should it be chosen?

With fluids carrying a high dirt load and a wide particle size distribution; in processes with varied chemistry; in high-flow applications requiring a low ΔP. When not to choose it: in sterile barrier applications requiring absolute filtration below 0.2 µm, the standard wound construction may not be adequate.

Usage Warning These filters are single-use; they cannot be cleaned and reused. When the differential pressure reaches the recommended replacement point (2.0–2.4 bar), replace the filter immediately.

Application and Selection Criteria

Pre-Filtration Requirement: Pre-filtration is essential with a high particle load; it delays clogging of the string-wound cartridge and extends the change interval.
Pressure Gauge Calibration: Check the calibration of the inlet/outlet differential pressure gauges periodically, at least every 6 months.
Gasket and Lubricant Selection: Do not use mineral-based lubricants when changing gaskets; use only pure silicone grease for elastomer health.
Replacement Based on Differential Pressure (ΔP): Decide on cartridge replacement by ΔP pressure drop, not operating hours. Record the initial value of the clean cartridge; replace the cartridge when the maximum permitted ΔP limit is reached.
Media Selection at High Temperatures: For processes above 80 °C, bleached cotton or glass fibre media should be chosen instead of polypropylene.

Products that work with the string-wound cartridge

Housings the cartridge fits, alternatives with the same end-cap types and the parts needed for connection.

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Transparent bowl for low pressure.

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Request everything in one quote: let’s size the cartridge, housing and connection parts together.

Your Questions Answered

Frequently Asked Questions

At Prosestim, we are committed to answering your questions and providing technical support for our filtration solutions.

What is a string-wound cartridge filter and how does it work?

A string-wound cartridge filter is a depth filter made by winding yarn layer by layer onto a PP or stainless steel centre core at a controlled winding angle. The winding density is graded to be tight on the inside and looser towards the outside, so the outer layers retain coarse particles and the inner layers progressively finer ones. The cross-winding geometry prevents direct flow channels from forming and forces the fluid to follow a tortuous path. In Prosestim cartridges, the media is made from pure yarn free of adhesives and resins.

In what micron ratings is it made, and which micron rating should I choose?

Prosestim string-wound cartridge filters are made in a wide micron range from 0.8 µm to 150 µm; 0.8 µm is offered only in natural cotton media. The choice is made according to the smallest particle size to be retained and the sensitivity of the equipment to be protected: 5 µm for reverse osmosis membrane protection, 10–25 µm for general pre-filtration and 50 µm and above for coarse sediment separation are common choices. On lines with a high particle load, using a coarse-micron pre-filter significantly extends the change interval of the fine-micron cartridge.

Which of the 8 raw material options should I choose?

The yarn is chosen according to the chemical character and temperature of the fluid. Polypropylene yarn is well suited to water, process water and dilute acid and base solutions; it has moderate resistance to mineral oils and is weak with concentrated inorganic acids, oxidisers and chlorinated solvents. Natural and bleached cotton yarn offer high resistance in oils and chlorinated and aromatic solvents. Glass fibre yarn is made for strong acid and high-temperature environments. The nylon, polyester, acrylic and viscose options are preferred for polar solvents and special process conditions. The right media choice is critical for production safety as well as filter life.

What temperature can a string-wound cartridge filter withstand?

Temperature resistance varies with the chosen yarn media. With polypropylene media, the nominal operating temperature is 60 °C and the maximum 80 °C. Nylon and polyester media can operate up to 121 °C, cotton and viscose media in the 120–160 °C range, and glass fibre media up to 399 °C with an SS core. The most common mistake in the field is running the media above its temperature limit; in processes above 80 °C, switch from polypropylene to bleached cotton or glass fibre media.

When should the filter be replaced?

The replacement decision is based not on elapsed time but on the differential pressure (ΔP) between inlet and outlet. The recommended replacement range is 2.0–2.4 bar; the maximum permitted ΔP is limited to 2.5 bar at 30 °C in the normal flow direction and 2.1 bar at 25 °C in reverse flow. The correct practice is to record the initial ΔP of the clean cartridge and replace the cartridge when this value reaches the recommended limit. Exceeding the limit causes the winding layers to collapse and a risk of bypass. Gauge calibration should be checked every 6 months.

Which filter housings and connection types is it compatible with?

Standard cartridges have an outer diameter of 58 mm ±1, and a 107 mm ±1 outer diameter option is available for Big Blue-type housings. The inner diameter is the same for PP and stainless steel cores: 28 mm ±1. Length options are 5, 10, 20, 30, 40, 50 and 60 inches. DOE and SOE end types, 215, 222 and 226 adapter standards and flat, Fin 1 and Fin 2 geometries are offered. The O-ring and gasket material is chosen as silicone, nitrile, EPDM, Viton or Teflon according to the process’s chemical and thermal conditions. These combinations are compatible with most common filter housing brands.

Can a string-wound cartridge filter be washed and reused?

No, string-wound cartridge filters are single-use and cannot be cleaned and reused. Because particles are mechanically locked deep in the yarn layers, backwashing or pressurised water does not remove the dirt; the process loosens the winding density and spoils the nominal micron rating. When the differential pressure reaches the recommended replacement point, replace the cartridge immediately. When changing gaskets, do not use mineral-based lubricants; use only silicone grease.

When should a string-wound filter be chosen, and when not?

String-wound cartridges are preferred especially with fluids carrying a high dirt load and a wide particle size distribution, in processes with varied chemistry and in high-flow applications requiring a low ΔP. Thanks to the depth structure, the contaminant load is spread through the entire volume and pressure rises linearly rather than suddenly. On the other hand, in sterile barrier applications requiring absolute filtration below 0.2 µm, the standard wound construction is not adequate; in these processes, switch to absolute-rated pleated cartridges. For efficient operation, system flow should not exceed 75% of the unit’s capacity.

Box Dimensions

335 × 410 × 560 mm: Capacity: 30 pcs per carton for 20" / 60 pcs per carton for 10".
335 × 410 × 810 mm: Capacity: standard packing of 25 pcs per carton for 30" cartridges.
335 × 410 × 1055 mm: Capacity: standard packing of 25 pcs per carton for 40" cartridges.

Shipping Note: 10-inch cartridge filters are shipped securely in 20-inch boxes, packed in two layers.

Fast Quote & WhatsApp Consultation

String-Wound Cartridge Filter RFQ Configurator

Configure your variation dimensions and technical specifications to receive an instant quote directly on WhatsApp and via email.

1 Select Variation Type

2 Dimensional & Technical Specifications

End Connection Type:

Filter Length: 5 Inch

5 Inch 60 Inch

Inner Core:

Micron Rating: 1 Micron

1 Micron 150 Micron

Filter Diameter / Format:

Gasket Type:

Adapter 1:

215

222

226

Adapter 2:

O-Ring Type:

3 Required Quantity

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