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Virgin wood-pulp furnish
Softwood and hardwood pulps are referenced as raw-material options.
Cellulose filtration media
Industrial Filter Papers
Virgin wood-pulp filter papers for supported industrial filtration, where porosity, bursting strength, particle retention and flow must be specified together.
Original product references
Product and system imagery
These first-party Sri Bharathi images are retained from the previous website. Grade tables are legacy published references; confirm current availability, tolerances and test methods with the quotation.
Operating principle
How the filtration product works
Industrial filter paper is a porous fibre sheet that supports fast or coarse filtration by allowing liquid to pass while retaining suspended matter at the surface and within the fibre network. A cake may form and become part of the filtration mechanism as solids accumulate.
Flow and retention must be considered together: an open sheet may deliver rapid throughput but retain fewer fine particles, while a denser sheet can improve clarification at the cost of higher resistance and shorter cycles under heavy solids load.
Media design
Construction and process behaviour
Sri Bharathi states that its filter papers are manufactured from virgin wood pulps, including softwood or hardwood furnish. Premium grades may receive impregnation to balance wet strength and other properties for the intended filtration duty.
Published critical parameters include porosity, bursting factor, particle-retention character and flow rate. These properties should be tied to a test method and grade tolerance before purchasing decisions are made.
What to evaluate
Important features and benefits
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Fast or coarse filtration
The range is positioned for duties where throughput and gross solids removal are important.
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Wet-strength options
Premium grades may be impregnated for aqueous strength and application fit.
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Measured performance inputs
Porosity, bursting factor, retention character and flow rate are key specification fields.
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Converted formats
Sheets, circles or equipment-specific cut shapes can be discussed against a drawing.
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Trial-based approval
Actual fluid testing resolves the tradeoff between clarity, flow and sheet life.
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 |
|---|---|---|
| Fibre source | Virgin softwood or hardwood pulp. | Fibre morphology influences formation, strength and permeability. |
| Porosity | Legacy PPN guide: 5 sec (PPN 01), 7 sec (PPN 15), 10 sec (PPN 02). | Confirm the current test method and tolerance; relates to permeability and filtration speed. |
| Bursting factor | Legacy PPN guide lists 4 kg/cm² for PPN 01, PPN 15 and PPN 02. | Confirm the current method and wet/dry basis; indicates mechanical robustness. |
| Particle retention | Characterised by grade and process trial. | Not interchangeable with an absolute membrane rating. |
| Flow rate | Grade- and fluid-specific. | Depends strongly on viscosity, pressure, area and solids loading. |
| Impregnation | Premium grades may be treated for required properties. | Confirm chemistry, extractables and contact suitability. |
| Dimensions | Application-specific converted sheets or discs. | Approved drawing reduces risk of bypass and fit errors. |
Process fit
Applications and selection considerations
Industrial filter papers may be used in chemicals, pharmaceuticals, foods, beverages, cosmetics and general process filtration where a supported disposable sheet is appropriate. They can serve as gross particulate media, cake-support layers, prefilters or laboratory/process-development tools.
How to compare grades
- Test equal effective area under the same feed, temperature and pressure.
- Measure initial flow and total throughput to the defined endpoint.
- Compare filtrate clarity or particle result at several points in the cycle.
- Inspect for tearing, edge bypass, fibre release and difficult cake removal.
- Review contact, traceability and extractables documents before regulated use.
Questions engineers ask
Frequently asked questions
Is filter paper specified only by GSM?
No. GSM indicates mass per area. Porosity, formation, thickness, fibre furnish, strength and treatment determine how the sheet behaves.
What is bursting factor?
It is a measure related to resistance to rupture under a specified test. The value is meaningful only with its method, units and whether the sample is wet or dry.
Why can laboratory flow differ from plant flow?
Viscosity, temperature, effective area, pressure, solids concentration and cake development may all differ between the test and production equipment.
Can filter paper be reused?
These papers are generally treated as disposable media. Reuse would require a demonstrated cleaning, integrity and contamination-control procedure.
Continue specifying
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