01
100% polypropylene
Broadly compatible material for many aqueous and chemical duties.
Filter cartridges
Spun-Bonded Filter Cartridges
Binder-free polypropylene depth cartridges with a progressive outside-to-inside structure for contaminant capacity and general process pre-filtration.
Operating principle
How the filtration product works
Spun-bonded cartridges are formed by depositing polypropylene fibres into a self-supporting depth structure. Sri Bharathi describes a true gradient density from the outer to the inner surface. Feed flows outside to inside: coarser voids encounter larger particles first and finer inner zones progressively retain smaller material.
Captured particles remain within the depth matrix while filtrate passes to the core. This distribution can provide useful dirt capacity and low initial pressure drop in general pre-filtration and clarification duties.
Media design
Construction and process behaviour
The published construction is 100% polypropylene fibre, continuously formed around a central moulded core or supplied in coreless versions. The process does not require binders, resins or lubricants, and the product is described as resistant to media migration under normal intended service.
One-piece lengths up to 1016 mm and more are referenced. Exact diameter, core, end connection, rating type and operating limit must be matched to the housing and fluid.
What to evaluate
Important features and benefits
02
Binder-free formation
Published as free of surfactants, binders and adhesives.
03
Gradient depth
Progressive outside-to-inside structure supports staged particle capture.
04
Core or coreless
Construction can be selected around pressure and housing needs.
05
Broad diameter choice
Standard, big-blue and larger diameters are listed.
06
Custom lengths
Standard 10–40 inch and custom sizes are referenced.
Technical data
Specification and enquiry checklist
Values below are limited to information published by Sri Bharathi. Final grade, compatibility and operating limits must be confirmed against the actual process.
| Selection parameter | Available / verified information | Engineering relevance |
|---|---|---|
| Material | 100% polypropylene fibres. | Confirm fluid, concentration and temperature compatibility. |
| Lengths | 10, 20, 30 and 40 inches; custom sizes available. | Match effective housing length. |
| Micron options | 0.5, 1, 5, 10, 20, 25, 50, 75 and 100 µm. | Confirm nominal/absolute basis and test method. |
| Outside diameters | 64 mm (2.5 in), 114 mm (4.5 in), 6 in and 8 in. | Select for housing clearance and required area. |
| Inside diameters | 25, 28 and 48 mm. | Match support core and end hardware. |
| Configurations | DOE and Code 7 (226 O-ring). | Confirm gasket/O-ring and seating geometry. |
| Construction length | One piece up to 1016 mm and more is referenced. | Reduces joints; verify handling and housing fit. |
Process fit
Applications and selection considerations
Published applications include food and beverages, pharmaceuticals, fine chemicals, magnetic coatings, petrochemicals, cosmetics, water treatment, metal finishing and electronics. Spun media is commonly evaluated as a prefilter before finer pleated cartridges or as a general particulate-removal element.
Selection factors
- Incoming solids load and distribution
- Target retention and acceptable downstream particle burden
- Required initial flow at clean pressure drop
- Housing diameter and length
- Core need under differential pressure and temperature
- Disposal, traceability and contact-document requirements
Questions engineers ask
Frequently asked questions
What does gradient density mean?
The outer structure is more open and becomes finer inward, helping distribute solids rather than loading only the outside surface.
When is a core recommended?
A core can provide extra mechanical support where differential pressure, temperature or handling demands warrant it. Confirm the actual cartridge limit.
Is polypropylene compatible with every chemical?
No. It has broad compatibility, but concentration, temperature, exposure time and seals must be checked.
Can a spun cartridge replace a pleated cartridge?
Sometimes for pre-filtration, but the two constructions differ in area, rating precision and loading behaviour. Trial data should guide substitution.
Continue specifying
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Application support
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Share your fluid, temperature, desired clarity, existing equipment and dimensions. Our team can then recommend a suitable construction and prepare a quotation.