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Depth Filter Cartridges

Custom Filtration Solutions (CFS) offers a wide range of depth filter cartridges, including melt blown, string wound, and resin-bonded designs. These cartridges provide superior particle retention throughout the filter cross-section, delivering higher efficiency, lower pressure drop, and greater solids holding capacity than standard filter elements.

Top Features and Use Cases

  • Gradient pore structures for high dirt holding capacity
  • Broad chemical compatibility with acids, alkalis, and solvents
  • Low differential pressure and long service life
  • Available in multiple diameters, lengths, and retention ratings
  • Applications across pharmaceutical, food & beverage, electronics, chemical, and petroleum industries

Filter Types

Melt Blown Filters

Melt blown cartridges are constructed from pure polypropylene fibers using a gradient-density structure. They offer high porosity, consistent retention, and chemical compatibility, making them suitable for prefiltration of water, solvents, and aggressive chemicals. Variants with larger diameters are available for higher flow rates and bulk filtration needs.

String Wound Filters

String wound cartridges are manufactured by winding polypropylene, cotton, or glass fiber yarn onto a porous core. Their honeycomb design provides depth filtration, with larger pores on the outside and tighter pores inside, ensuring effective removal of suspended solids, rust, and other impurities in fluids with relatively low viscosity.

Resin-Bonded Filters

Resin-bonded cartridges feature a rigid, one-piece structure reinforced with resin-impregnated fibers. They provide high contaminant capacity, stable performance under pressure fluctuations, and are particularly effective in filtering viscous liquids such as paints, inks, adhesives, resins, coatings, and petroleum products.

Consolidated Comparison

Depth Filter Cartridge Types at a Glance
Type Typical Use Cases Key Specs (Compact) Distinguishing Features
Melt Blown General liquid prefiltration, RO protection, high-flow bulk filtration
  • Material: 100% polypropylene
  • Design: Gradient-density
  • Diameters: Standard and large (e.g., 4.5"–6")
High porosity, broad chemical compatibility, low pressure drop
String Wound Edible oils, syrups, chocolate, solvents, chemical pretreatment
  • Media: PP, cotton, or glass fiber yarn
  • Core: Polypropylene or stainless steel
  • Structure: Honeycomb, dense inside / loose outside
Excellent depth effect, long service life, customizable media
Resin-Bonded Viscous fluids: paints, inks, adhesives, resins, coatings, petroleum
  • Media: Resin-impregnated fiber
  • Lengths: 10"–40"
  • Removal: 2–150 μm
  • Max ΔP: ~4.3 bar
Rigid structure resists deformation, high contaminant capacity

Compatibility and Accessories

  • Connector options: DOE, 222 Flat/Fin, 226 Flat/Fin
  • Seal materials: Silicone, EPDM, NBR, Viton
  • Surface styles: Grooved or embossing
  • Cores available in polypropylene or stainless steel

FAQs

What makes a depth filter different from a surface filter?

Depth filters capture particles throughout the entire filter thickness, whereas surface filters retain contaminants mainly on the outer surface.

Which industries use depth filters most often?

Depth filters are widely used in pharmaceutical, food & beverage, electronics, chemical, and water treatment industries due to their efficiency and chemical resistance.

What’s the advantage of resin-bonded filters?

Resin-bonded cartridges provide rigidity, resistance to deformation, and high contaminant holding capacity, making them suitable for viscous fluids.