String Wound Polypropylene Filter Cartridge
Material: Polypropylene wire
Frame material: PP/stainless steel
Maximum pressure resistance: ≤0.5MPa
Using temperature: ≤60°C
Filter accuracy: 1-100μm
Size: 10 inches, 20 inches, 30 inches, 40 inches
Product Overview
The String Wound Polypropylene Filter Cartridge is a high-performance depth filtration element engineered to remove rust, silt, suspended solids, and colloids from water and process fluids.
Crafted with food-grade polypropylene yarn wound around a durable core, it provides a gradient-density structure that captures large particles on the outer layer and fine impurities on the inner layer-achieving maximum dirt-holding capacity with minimal pressure drop.
Available in 1–100μm filtration precision (same price across all ratings) and lengths from 10" to 70", this cartridge is ideal for RO pre-treatment, desalination, food & beverage, and chemical processing.
Technical Specifications
| Item | Specification |
|---|---|
| Filter Material | PP yarn / Degreased cotton |
| Core Material | PP (standard) / Stainless steel (optional) |
| Length | 10"–70" |
| Micron Rating | 1–100μm |
| Inner Diameter | 28mm / 30mm |
| Outer Diameter | 60mm / 65mm |
| Max Pressure | 10 bar |
| Max Temperature | 60°C (PP) / 120°C (SS) |
| PH Range | 1–14 |
| Function | Removal of rust, silt, colloids, and suspended solids |
PP Yarn vs. Degreased Cotton Yarn
| Feature | Polypropylene (PP) Yarn | Degreased Cotton Yarn |
|---|---|---|
| Application | Standard choice for RO, industrial, and potable water filtration | Pharmaceutical, semiconductor, and ultrapure water |
| Temperature Resistance | Up to 60°C (PP core) / 120°C (SS core) | Up to 120°C |
| Chemical Resistance | Excellent against acids, alkalis, solvents | Sensitive to strong acids/alkalis |
| Purity Level | Safe for potable and industrial use | For ultra-clean environments |
| Cost Efficiency | Economical | Higher cost, niche use |
💡 Tip: For general water treatment and RO systems, PP yarn is recommended. Choose cotton yarn only for high-purity or laboratory-grade applications.
Product Advantages
1. Deep Gradient Filtration
Multi-layer winding captures both coarse and fine particles.
Extends service life by 30% compared to uniform-density filters.
2. Flexible Core Options
Standard PP core suits most systems.
Stainless steel core for high-temperature or corrosive liquids.
3. Same Price Across All Micron Ratings
Simplifies procurement and inventory - from 1μm to 100μm, all options share the same cost structure.
4. High Compatibility
Ideal for RO, EDI, and desalination plants, compatible with most standard filter housings.
Application Scenarios
RO & UF Pre-filtration – Prevents membrane fouling and extends lifespan.
Desalination Plants – Reliable performance under high sediment load.
Food & Beverage – Ensures water purity for processing and bottling.
Chemical & Industrial Water Treatment – Handles acids, alkalis, and solvents.
Pharmaceutical / Laboratory – Cotton yarn version for ultrapure systems.
Customer Case Study: Saudi Arabia Desalination Project
In 2024, Ink-Blue supplied 39,200 units of 5-micron 70-inch string-wound filter cartridges to a Saudi Arabian desalination plant.
The project required filters capable of handling high-salinity and fine colloidal particles in a continuous RO system. Ink-Blue's PP-yarn filters with reinforced cores provided stable flow rates, minimal pressure loss, and over 20% longer lifespan compared to the previous supplier.
- 🌍 Location: Dammam, Saudi Arabia
- ⚙️ Model Used: 5μm, 70-inch, PP yarn with PP core
- 💧 Application: RO membrane pre-filtration in seawater desalination
- 🏆 Result: Reduced replacement frequency by 25%, improved system uptime, and saved 15% maintenance cost annually.
See Our Production Process
🎥 Watch how Ink-Blue manufactures high-quality string wound cartridges in our YouTube video:
▶️ String Wound Filter Cartridge Production Process – Ink-Blue Water Solutions
Area Focus: Reliable Supply for the Middle East & Global Markets
Ink-Blue has established long-term supply partnerships in Saudi Arabia, UAE, Oman, and Qatar, supporting desalination, food processing, and industrial filtration projects.
Our factory's monthly production capacity exceeds 250,000 cartridges, ensuring consistent lead times and cost-effective logistics for large-volume orders.
With export experience to over 30 countries, including Southeast Asia, Africa, and Europe, Ink-Blue is a trusted OEM/ODM supplier for distributors and engineering contractors worldwide.
FAQ
Q1: Which filtration accuracy is best for RO pre-filtration?
→ 5–20μm is recommended to remove rust, silt, and colloids before the RO membrane stage.
Q2: How often should I replace the cartridge?
→ Municipal water: every 2–3 months.
→ Industrial wastewater: every 2–4 weeks.
→ Replace when flow drops by 30% or pressure loss exceeds 2 bar.
Q3: Can I use it with hot or corrosive liquids?
→ PP core: up to 60°C.
→ Stainless steel core: up to 120°C and high-corrosive conditions.
Q4: What's the main difference between string wound and melt-blown filters?
→ String wound: higher dirt-holding capacity, better for high-sediment water.
→ Melt-blown: uniform pore size, better for fine precision.
Q5: Is it safe for drinking water?
→ Yes. Made from FDA-approved food-grade polypropylene, safe for potable water systems.
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