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Melt Blown Filter Element

Polypropylene Melt Blown Filter Element - High-Dirt-Capacity Depth Cartridges

The polypropylene melt blown filter element is a continuous-fiber depth filter manufactured through thermal extrusion and high-velocity microfiber deposition of 100% virgin polypropylene resin. Designed with a true gradient-density matrix, it features a coarse outer zone for primary particulate capture and a tight inner core for precision particle retention. This depth structure utilizes the entire filter body rather than surface area alone, extending service life and reducing operational pressure drop.

Produced without thermal binders, adhesives, surfactants, or antistatic additives, these cartridges prevent fluid contamination and media leaching in high-purity water, chemical processing, and food contact applications.

Flow Path: Outside to Inside
[ Outer Layer ] 30 - 50 micron fibers --> Traps coarse sand, rust, and scale
[ Middle Layer ] 10 - 20 micron fibers --> Captures medium suspended solids
[ Inner Core ] 1 - 5 micron fibers --> Reaches final micron rating cutoff

PP Melt-blown Filter Cartridge

Product Name: PP melt-blown filter cartridge, PP melt blown filter elementMaterial: polypropylene(PP)Diameter: 65mm-115mm, or customized according to requestLength: 10inch, 20inch, 30inch, 40inch and

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Phenolic Resin Filter Cartridge

Product Name: Phenolic resin filter cartridge, resin bonded filter cartridgeMaterial: Phenolic resinDiameter: outside 65mm and inside 28mmLength: 9.75inch-40inch(248mm-1016mm).Filter Micron:

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Technical Specifications & Dimensions

Parameter	Standard Specification	Custom Options
Filter Media	100% Virgin Polypropylene (PP)	Microfiber thermal-bonded matrix
Micron Ratings	1, 3, 5, 10, 20, 25, 50, 75, 100 micron	Custom multi-layer density profiles
Nominal Length	10 inch, 20 inch, 30 inch, 40 inch (254mm - 1016mm)	Custom lengths up to 70 inches
Outer Diameter (OD)	60mm - 63mm (2.5 inch) / 114mm (4.5 inch Big Blue)	Customized up to 115mm
Inner Diameter (ID)	28mm / 30mm	Internal support core optional
End Cap Types	DOE (Double Open End)	SOE 222/Flat, 222/Fin, 226/Flat, 226/Fin
Gasket / O-Ring	Silicone, EPDM, NBR, Viton	Thermally welded fittings
Core Structure	Coreless (Standard Self-Supporting)	Polypropylene Inner Core

Operating Limits

Parameter	Specification
Maximum Operating Temperature	60 °C (140 °F) at 2.1 bar
Maximum Differential Pressure at 20 °C (68 °F)	4.1 bar (60 psi)
Maximum Differential Pressure at 60 °C (140 °F)	2.1 bar (30 psi)
Recommended Change-out Differential Pressure	2.0–2.5 bar (29–36 psi)
Flow Direction	Outside to Inside (OTI)

Technical Performance & Material Integrity

True Graded Density vs. Surface Loading

Outer Zone: High-porosity fiber network prevents premature surface blinding and manages high inlet turbidity.

Core Zone: High-density microfiber matrix maintains target micron cutoff without channel bypass under pressure spikes.

Chemical & Physical Stability

Zero Chemical Binders: Thermally fused polypropylene eliminates foaming, extractables, and chemical reactions with aggressive process fluids.

Surface Fiber Locking: Thermally glazed or grooved outer surface locks loose microfibers in place, preventing downstream fiber migration during pressure surges.

PH Compatibility: Fully resistant to inorganic acids, bases, alkalis, and organic solvents across pH 1 - 14.

Primary Industrial Applications

RO System Pre-Filtration: Protects polyamide reverse osmosis membranes from particulate fouling, bio-silt, and suspended solids in desalination and pure water plants.

Industrial Water Treatment: Polishing filter for cooling towers, boiler feedwater, circuit board washing, and industrial wastewater treatment lines.

Chemical Processing: Filtration of acids, alkaline solutions, solvents, plating baths, and liquid reagents.

Food & Beverage Pre-Filtration: Clarification of process water, bottled water, syrup pre-filtration, and spirits clarification conforming to FDA fluid contact criteria.

Paints, Coatings & Inks: Particle agglomerate removal and gel filtration without altering liquid viscosity or coating chemistry.

Product Coding System & Selection Matrix

01/

Use the matrix below to generate the exact part number for your RFQ or order:
Example Part Number: EF-MB-10-05-DOE-S-CEF-MB - [Length] - [Micron] - [End Cap] - [Seal] - [Core]
Series Code: EF-MB (Melt Blown Polypropylene)
Length Code: 10 (10 inch), 20 (20 inch), 30 (30 inch), 40 (40 inch)
Micron Rating: 01 (1 micron), 05 (5 micron), 10 (10 micron), 25 (25 micron), 50 (50 micron)

02/

End Cap Type:
DOE: Double Open End (Plain Ends)
222F: SOE 222 O-Ring / Flat Cap
222N: SOE 222 O-Ring / Spear Fin
226F: SOE 226 O-Ring / Flat Cap
226N: SOE 226 O-Ring / Spear Fin
Gasket / O-Ring Material: S (Silicone), E (EPDM), V (Viton), N (NBR)
Internal Core Option: N (None / Coreless), C (Polypropylene Inner Core)

Manufacturing Process & Quality Assurance

To ensure batch-to-batch consistency and structural reliability, every production batch follows strict quality inspection protocols:
Raw PP Resin Testing (MFR & Purity Inspection)
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Automated Extrusion & Microfiber Spinning
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Online Laser Diameter & Weight Density Monitoring
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Thermal End-Cap Welding (SOE / DOE Configuration)
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Differential Pressure & Bubble-Point Sample Testing
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Dust-Free Bagging & Palletized Export Packaging

Factory Inspection Benchmarks

Inspection Item	Testing Method & Target	QC Standard
Resin Purity	Melt Flow Index (MFI) verification	100% Virgin Grade PP
Dimensional Tolerance	Digital caliper measurement on Length, ID, OD	+/- 0.5mm
Weight Consistency	Inline weight scale monitoring	+/- 2% per batch
Bubble Point Test	Pore size distribution check	ISO 2942 Compliant
Dirt Capacity	ISO Fine Dust particulate loading test	Batch Sample Verified

OEM / ODM Customization Capabilities

Dimensional Customization

Custom outer diameters (up to 115mm), internal diameter adjustments, and specialized length cutting.

Surface Finish Options

Deep grooved surface (increases total surface area by up to 30%), orange-peel textured finish, or smooth thermally glazed finish.

Private Label Packaging

Customized polybags, branded inner boxes, barcoded master cartons, and neutral packaging options.

Structural Reinforcement

Internal support cores or external protective cages for high-viscosity fluids or heavy hydraulic pressure fluctuations.

FAQ

Q: What is the structural difference between a coreless melt blown filter and one with an inner core?

A: Coreless melt blown cartridges rely on the density of the thermally bonded polypropylene fiber matrix for rigidity. They are ideal for standard low-pressure systems up to 2.0 bar. Cartridges equipped with a solid polypropylene inner core provide extra collapse resistance under high differential pressure up to 4.1 bar or in systems with frequent pump start-stop shocks.

Q: What is the recommended differential pressure for replacing melt blown cartridges?

A: Cartridges should be replaced when the differential pressure across the filter housing reaches 2.0 to 2.5 bar (29 to 36 psi), or when flow rates drop below operational requirements. Operating beyond 2.5 bar risks fiber deformation, particle bypass, or reduced filtration efficiency.

Q: Can melt blown filter cartridges be washed or backflushed for reuse?

A: No. Melt blown cartridges are depth-type filter media that capture particles throughout the internal fiber matrix. Trapped contaminants cannot be backwashed out. Attempting to clean depth cartridges damages the microfiber layout, widening internal pores and ruining filtration performance.

Q: How do you prevent fiber shedding in high-flow applications?

A: Fiber shedding happens when low-grade resin is used or extrusion heating is inconsistent. Our manufacturing process uses 100% virgin polypropylene resin combined with continuous thermal glazing on the outer and inner surfaces. This fuses loose surface fibers together without restricting open pore area.

Q: What is the difference between nominal and absolute micron ratings for melt blown filters?

A: Melt blown depth cartridges are rated nominally, with efficiency between 85% and 90% at the specified micron size. For critical filtration processes requiring 99.9% efficiency (Beta 5000), pleated membrane cartridges or multi-layer micro-denier filter elements are recommended.

Q: Are these polypropylene filter cartridges safe for food and drinking water contact?

A: Yes. The cartridges are produced using 100% pure virgin polypropylene resin without added solvents, binders, or wetting agents. Materials meet FDA fluid contact standards under Title 21 CFR and comply with drinking water pre-filtration requirements.

Q: Are melt blown filter elements compatible with strong chemical solvents and acids?

A: Polypropylene offers high chemical resistance to most inorganic acids, bases, alkalis, and organic solvents. However, concentrated oxidizing agents such as nitric acid or strong aromatic hydrocarbons can degrade polypropylene. Please contact our engineering team with your fluid composition and operating temperature for verification.

As one of the leading melt blown filter element manufacturers and suppliers in China, we offer a wide range of products with superior quality. Please rest assured to buy advanced melt blown filter element from our factory. We also accept customized orders.

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