01
All-PP construction
Media and structural components are described as polypropylene.
Filter cartridges
PP Pleated Filter Cartridges
All-polypropylene pleated cartridges with gradient-density microfiber media, designed to combine defined retention options, area and contaminant capacity.
Operating principle
How the filtration product works
PP pleated cartridges arrange microfiber media in folds around a central core, creating more filtration area than a flat cylinder of the same length. Sri Bharathi describes a gradient-density structure that is more open on the outside and finer toward the inside, allowing larger particles to be captured upstream while finer layers perform final retention.
Flow passes through the pleated pack to the core and then to the clean side of the housing. The greater area can lower initial flux per unit area and increase useful throughput, subject to media rating, solids load and differential-pressure limits.
Media design
Construction and process behaviour
Published construction is all polypropylene with a robust outer cage and thermally welded assembly, avoiding adhesives in the fluid path. The product page references nominal and absolute options, gradient-density microfiber media and a surface area above 0.5 m².
Polypropylene offers broad compatibility, but every fluid, temperature and concentration should be checked. Seal materials and sanitisation exposure also require confirmation.
What to evaluate
Important features and benefits
02
Gradient-density media
Open-to-fine layers distribute captured solids through the media structure.
03
Pleated surface area
Published area is more than 0.5 m², depending on configuration.
04
Thermally welded
Construction is described as welded rather than adhesively bonded.
05
Multiple end codes
DOE, 226 and 222 O-ring styles are available in flat or fin variants.
06
Wide application range
Published uses span pharmaceuticals, beverages, water, gelatin and fine chemicals.
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 |
|---|---|---|
| Lengths | 10, 20, 30 and 40 inches. | Match housing length and stacking requirements. |
| Published micron options | 0.1, 0.2, 0.45 and 1–50 µm; source wording also references 0.1–40 µm. | Confirm exact grade, rating type, efficiency and test method. |
| Outside diameter | 69 mm. | Verify clearance within the housing. |
| Inside diameter | 28 mm. | Relevant to core geometry and flow path. |
| Surface area | More than 0.5 m². | Exact value depends on length and pleat pack. |
| End configurations | DOE; Code 7F/7S (226); Code 3F/3S (222). | Match socket, locking and seal arrangement. |
| Rating type | Nominal and absolute options are referenced. | Request the efficiency definition and validation data for the selected grade. |
Process fit
Applications and selection considerations
Published applications include fine chemicals, pharmaceuticals, deionised water, RO pre-filtration, ophthalmic liquids, biological fluids, oral drugs, photographic processes, emulsions, gelatin and beverages including wine, beer, fruit juice and alcohol.
Selection cautions
- A 0.2 or 0.45 µm label is not by itself a sterility claim.
- Confirm pressure-drop curves in the actual fluid viscosity and temperature.
- Review polypropylene and seal compatibility with solvents, oxidisers and hot cleaning.
- Use upstream clarification where heavy solids would rapidly blind fine pleats.
- Request current grade-specific contact and validation documents where regulated.
Questions engineers ask
Frequently asked questions
Are these cartridges sterilising-grade filters?
No sterilising-grade claim should be inferred from micron size alone. That requires grade-specific bacterial-retention validation and controlled manufacturing documentation.
Why use gradient-density media?
It can distribute particles by size through the structure, improving contaminant capacity compared with a single uniform fine layer.
What is the difference between Code 7 and Code 3?
Code 7 uses a 226 O-ring connection; Code 3 uses 222. Flat or fin-end variants affect housing fit and orientation.
Can PP cartridges filter gelatin?
Gelatin is a published application. The grade must still be selected around temperature, viscosity, preclarification and target retention.
Continue specifying
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Application support
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