01
Sparkler filter pads
Circular pads and fabric media cut for horizontal plate sparkler filters, selected around plate geometry and process duty.
Sparkler filter pads →Core product category
Industrial Filter Pads for Process Clarification
Sri Bharathi manufactures cellulose-based and application-specific filter pads for clarification, polishing and particulate-retention duties across industrial liquid processes.
Depth filtration explained
What industrial filter pads do
An industrial filter pad is a porous sheet or cut shape placed in a filter press, sparkler assembly or other supported filtration arrangement. Unlike a simple screen, a depth pad presents a tortuous network of fibre passages. Particles are intercepted within this matrix and, depending on the duty, at the upstream face as a filter cake develops.
Cellulose filtration media can combine clarification, solids-holding capacity and manageable flow resistance. The correct result depends on the complete grade—not on thickness or GSM alone. Fibre furnish, formation, density, porosity, impregnation, wet strength and surface condition all affect performance.
Cellulose purity and alpha cellulose
Alpha cellulose is the high-molecular-weight, alkali-insoluble portion of cellulose. Higher-purity furnish can reduce non-cellulosic extractables and improve consistency for sensitive applications, but purity alone does not define filtration efficiency. Sri Bharathi should confirm the alpha-cellulose level on the applicable grade documentation. Unverified 90% and 98% figures are intentionally not published here.
Product range
Choose the media family before narrowing the grade
02
Pulp filter pads
Virgin-pulp depth sheets for rough, normal, clarifying, polishing, fine and premium filtration categories.
Pulp filter pads →03
Activated carbon pads
Carbon-impregnated media combining filtration with adsorption for compatible colour and odour reduction duties.
Activated carbon pads →04
High-temperature pads
Heat-resistant media published for compatible liquids in the 180–250 °C operating range.
High-temperature pads →05
Industrial filter papers
Virgin wood-pulp papers for fast and coarse filtration with grade-dependent wet-strength treatment.
Filter papers →06
Lenticular depth media
Stacked depth sheets within enclosed modular constructions and internal drainage support.
Lenticular filters →Specification discipline
Parameters that belong on a filter-pad data sheet
| Selection parameter | Available / verified information | Engineering relevance |
|---|---|---|
| Fibre composition | Virgin wood pulp, cotton pulp or hybrid pulp are referenced in existing Sri Bharathi materials. | Influences purity, strength, compatibility, formation and depth structure. |
| Thickness | Grade- and application-specific; confirm by sample or approved drawing. | Affects bed depth, compressed fit and solids-holding volume. |
| Basis weight (GSM) | Legacy first-party grade guides publish selected GSM values; confirm current grades and tolerances. | Indicates mass per unit area but does not independently define retention. |
| Porosity / flow | Monitored during manufacture; request the relevant test method and limit. | Links permeability to pressure drop and cycle time. |
| Wet and dry strength | Bursting factor and wet-strength behaviour are monitored on applicable grades. | Reduces risk of tearing or media collapse during handling and filtration. |
| Particle retention | Define using process trials and an agreed clarity or particle criterion. | Depth media performance depends on the actual suspension and operating conditions. |
| Dimensions | Customisation is offered subject to drawing and equipment review. | Correct OD, ID, holes and edge geometry prevent bypass. |
| Temperature / chemistry | Confirm for each media and fluid; high-temperature pads have a separately published range. | Avoids swelling, strength loss, extractables or premature failure. |
Selection sequence
A practical way to compare pad candidates
1
Define the feed
Record fluid chemistry, temperature, viscosity, solids concentration and particle distribution.
2
Define the result
State whether the duty is rough filtration, clarification, polishing, colour reduction or protection of downstream media.
3
Confirm the equipment
Provide filter type, plate diameter, pad drawing, flow direction, seals and available differential pressure.
4
Trial under load
Compare initial flow, pressure rise, filtrate clarity, cycle time, yield loss and pad integrity.
5
Approve the grade
Freeze the tested construction, dimensions, acceptance criteria, packing and document requirements.
6
Monitor the cycle
Trend pressure, throughput and clarity so change-out decisions are based on process performance.
Common questions
Industrial filter pad FAQs
Does a higher GSM always mean finer filtration?
No. GSM is basis weight, not a direct pore-size or micron rating. Fibre furnish, formation, density, thickness and surface treatment also influence retention and flow.
What is the difference between surface and depth filtration?
Surface filtration retains most solids at a plane or growing cake. Depth filtration captures particles through a three-dimensional fibre matrix, often providing greater solids capacity for clarification duties.
Can one pad grade handle every batch?
Not reliably. Changes in viscosity, temperature, particle distribution, pre-treatment and solids concentration can materially change pressure rise and clarity.
Why are wet and dry strength both important?
Dry strength supports converting and handling. Wet strength helps the pad retain integrity after saturation and under process pressure.
How should alpha-cellulose purity be specified?
Ask for the declared value, test method and grade-specific certificate. Treat alpha-cellulose level as one material-quality input, not a complete filtration-performance claim.
Technical presentation
Filter Paper & Pad Deep Dive
Review the media families, pulp types, construction differences, published grade tables, high-temperature pads and activated carbon pads in this 10-page presentation.
Application support
Select a filter pad from actual operating data
Send the liquid, temperature, viscosity, solids load, desired clarity, filter-press details and current pad dimensions. Samples or trial quantities can then be discussed for the specific application.