Resin-Bonded Cartridge Filter: Paints, Inks and Viscous Fluids
Channel-Free Filtration in Viscous Fluids with a Phenolic and Acrylic Resin Matrix
The resin-bonded cartridge filter is a coreless depth filter hardened with phenolic or acrylic resin. It keeps its form under pressure in viscous fluids such as paints, inks, resins and adhesives; 1–150 µm.
1–150 µm
2.5 bar
80 °C
5–9
Product Identity and Technical Summary Panel
The resin-bonded cartridge filter is made by impregnating long cellulose and synthetic fibres with phenolic or acrylic resin and curing them with heat. It is a rigid-bodied depth filter that needs no internal support core. It was developed for heavy process conditions where soft cartridges such as melt-blown and string-wound compress or shed fibres. It replaces these cartridges on lines filtering thick fluids such as paints, varnishes, inks, adhesives, resins and petroleum derivatives.
Options from 1 µm to 150 µm can be used at different stages, from coarse filtration that separates pigment and gel agglomerates to fine final filtration such as inkjet ink. The resin type is chosen according to the line’s chemistry. The phenolic body stands out in solvent- and oil-dominated fluids, the acrylic body in water-based and saline solutions. Cartridges are made in 10″, 20″, 30″ and 40″ lengths, in standard and Big Blue diameters, with DOE or SOE ends. NBR, EPDM, Viton, silicone and PTFE gasket options are also available.
Further down the page you will find the cartridge’s working principle, operating limits, a chemical compatibility table by resin type and gasket options. Once you have settled on the right combination for your process, you can request a quote directly from the configurator at the end of the page by selecting resin type, length, micron rating and quantity.
Key Technical and Structural Features
- Filter Media
- Phenolic Resin-Bonded Long Fibre
- Acrylic Resin-Bonded Synthetic / Cellulose Fibre
- Coreless Rigid Composite Construction
- Filtration Range
- Nominal filtration precision from 1 µm to 150 µm; graded density from outside to inside.
- Filter Lengths
- 10"
- 20"
- 30"
- 40"
- Operating Compatibility
- Solvent-Based Paints and Printing Inks
- Resins, Polymers and Adhesives
- Mineral Oils and Lubricants
- Aggressive Chemical and High-Viscosity Lines
- Construction Type
- A coreless, very rigid thermoset cylindrical design that does not channel under high pressure.
- Connection Options
- DOE (Double Open End, Double Gasket)
- SOE Bayonet End Cap
- High-Temperature-Resistant Gasket / Adapter
- Production Model
- Standard series production and custom configurations made to process samples/technical drawings.
- Mechanical Strength
- The rigid resin-bonded structure keeps its form and micron rating up to a differential pressure of 2.5 bar at 25 °C (max. 1.0 bar at 80 °C).
Flow and Pressure Drop Performance in Viscous Fluids
Prosestim resin-bonded cartridge filters offer flow performance optimised with rigid depth filtration technology. Unlike conventional filters, the fibre structure fixed with phenolic or acrylic resin keeps its pore structure even with high-viscosity liquids and rising differential pressure values. Our micron options from 1 µm to 150 µm form a stable filtration layer, giving consistent efficiency throughout the cartridge’s service life. This rigidity reduces the risk of channelling, especially in processes with pressure fluctuations, improving operational safety and energy efficiency.
Filtration Architecture and Working Principle
Prosestim resin-bonded filters have a very rigid structure because their fibres are fixed with acrylic or phenolic resin. This rigid architecture keeps the fibres bonded together even under high pressure when filtering viscous fluids, preventing channel (bypass) formation.
Graded Rigid Depth and Pressure Stabilisation
Unlike standard polypropylene filters, Prosestim resin-bonded cartridge filters work with a “rigid graded density” architecture that does not collapse under pressure in high-viscosity fluids (paints, inks, adhesives). As the fluid moves from the outer surface of the rigid matrix towards its inner diameter, it meets a progressively narrowing labyrinth; this depth filtration principle keeps the pores stable even under high differential pressure and offers high dirt-holding capacity.
Resin-Bonded Fibre Matrix and Structural Reliability
Industrial filter cartridge performance depends not only on the architecture but on how stable that architecture stays under high differential pressure (ΔP) and chemical solvents. The key difference of Prosestim resin-bonded filters is their rigid matrix, cross-linked with phenolic or acrylic resin. This production method directly meets the high strength and thermal stability requirements of paint, solvent and petrochemical applications.
Predictable Loading Curve and Controlled Service Life
The biggest operational risk in industrial filter systems is not knowing when the filter will reach its capacity. In standard filters, when the fibre matrix collapses under pressure, ΔP jumps suddenly and bypass begins; by the time the operator notices, the process is already contaminated. In Prosestim resin-bonded filters, the rigid matrix reduces this uncertainty: as the cartridge starts to load, differential pressure rises linearly and predictably, with no sudden collapse.
Raw Material and Structural Engineering Design
Long cellulose and synthetic fibres form the filter’s skeleton. The longer the fibres, the more points at which each fibre bonds to its neighbours, and the greater the mechanical strength of the matrix. Phenolic or acrylic resin locks these fibres together at their crossing points and, when cured with heat, turns into a thermoset structure. This structure does not soften when heated again, does not break down on contact with solvents, and fibres do not break loose into the filtered fluid.
The body is made without a separate support core, and the entire thick wall works as filter media. Particles are therefore retained not only at the surface but across the full cross-section of the wall. Because there is no core, only fibre and resin come into contact with the fluid, so no separate core material has to be considered for chemical compatibility. The grooved outer surface enlarges the filtration area and holds large particles at the surface, so the deeper layers fill later. The rigid body also helps during installation. Because the cartridge ends are not crushed under pressure, the gasket seats evenly on the surface, and in DOE models the clamping pressure is distributed evenly all round. This helps maintain the seal throughout the cartridge’s life.
| Parameter | Resin-Bonded Filter Specification |
|---|---|
| Matrix Composition | Long-Fibre Filter Media Impregnated with Phenolic or Acrylic Resin |
| Micron Ratings | 1 µm, 5 µm, 10 µm, 25 µm, 50 µm, 75 µm, 100 µm, 125 µm, 150 µm |
| Surface Structure | Grooved – increased effective filtration area |
| Internal Support | Coreless, high-rigidity body |
| Max. Differential Pressure | 2.5 bar @ 25 °C |
| Standard Diameters | Outer Diameter: 65 mm · Inner Diameter: 27 mm |
| Big Blue Diameters | Outer Diameter: 115 mm · Inner Diameter: 28 mm |
| Length Options | 10", 20", 30", 40" |
Physical Construction and Filtration Surface Area
In a resin-bonded cartridge, the fibres are fixed with an acrylic or phenolic matrix, so the body does not collapse under pressure. All lengths from 10 to 40 inches are made with a one-piece body with no joints, which reduces the risk of bypass at high differential pressure. The rigid body keeps its form even with high-viscosity liquids, increasing the amount of particles retained per unit volume. The length is chosen according to the fluid’s viscosity and the line flow.
| Filter Length | Area of Use | Construction Architecture |
|---|---|---|
| 10 Inch | Sampling lines, pilot production of paints and inks | One-Piece Rigid Body |
| 20 Inch | Medium-flow paint, varnish and resin lines | One-Piece Rigid Body |
| 30 Inch | Central paint and solvent distribution systems | One-Piece Rigid Body |
| 40 Inch | High-flow viscous fluid lines | One-Piece Rigid Body |
Filter Material Chemical Compatibility Guide
The special acrylic- and phenolic-based matrix of resin-bonded filters is compatible with industrial solvents and aggressive chemical process fluids, preventing the material structure from breaking down. Showing high resistance to chemical attack when filtering aggressive industrial oils and high-viscosity liquids, this stable structure reduces the risk of fibre migration or foreign contaminants getting into the fluid.
E: Excellent · G: Good · F: Fair · P: Poor · N/R: Not recommended
Water and Inorganic Chemicals
| Chemical Group | Example Chemical | Acrylic Resin | Phenolic Resin |
|---|---|---|---|
| Drinking / Process Water | Process water, condensates | E | E |
| Organic Acids | Acetic acid (20%), citric acid | E | E |
| Dilute Inorganic Acids | Dilute HCl, H₂SO₄ (<10%) | F | F |
| Strong Inorganic Acids | Concentrated H₂SO₄, HCl | P | P |
| Alkalis | Ammonia, dilute NaOH | P | F |
| Strong Alkalis | NaOH 50%, concentrated KOH | N/R | N/R |
| Oxidising Agents | H₂O₂ (30%+), hypochlorite, ozone | N/R | N/R |
| Inorganic Salt Solutions | NaCl, CaCl₂, aluminium sulphate | E | E |
E: Excellent · G: Good · F: Fair · P: Poor · N/R: Not recommended
Organic Solvents and Oils
| Chemical Group | Example Chemical | Acrylic Resin | Phenolic Resin |
|---|---|---|---|
| Organic Solvents (Polar) | Acetone, MEK, IPA, ethanol | F | G |
| Aprotic Polar Solvents | DMF, DMSO, NMP | N/R | G |
| Organic Solvents (Aliphatic) | Hexane, heptane, white spirit | G | E |
| Organic Solvents (Aromatic) | Toluene, xylene, benzene | G | E |
| Chlorinated Solvents | DCM, TCE, perchloroethylene | N/R | G |
| Glycols | Ethylene glycol, propylene glycol | E | E |
| Mineral and Industrial Oils | Machine oil, hydraulic oil, fuel oil | E | E |
| Vegetable and Animal Oils | Olive oil, soybean oil, tallow | E | E |
Operating Conditions
Resin-bonded cartridge filters are depth filtration elements that offer high differential pressure resistance, chemical stability and the ability to keep their structural integrity under heavy process conditions. Thanks to their fibre matrix bonded with phenolic or acrylic resin, they perform reliably with solvent-based fluids, paint systems, resin applications and high-viscosity liquids.
The resin-reinforced rigid structure reduces media deformation under pressure fluctuations while offering stable flow distribution and a long service life. With different micron ratings, end cap options and elastomer compatibilities, it can be adapted and optimised for a range of industrial processes.
| Operating Parameter | Technical Value |
|---|---|
| Nominal Operating Temperature | 60 °C (140 °F) |
| Maximum Operating Temperature | 80 °C (176 °F) @ 1.0 bar (14.5 psi) |
| Maximum Operating Pressure (Forward Flow) | 4.2 bar (60.9 psi) @ 25 °C (77 °F) |
| Maximum Operating Pressure (Reverse Flow) | 2.1 bar (30.5 psi) @ 25 °C (77 °F) |
| Maximum Differential Pressure | 2.5 bar (36.3 psi) @ 25 °C (77 °F) |
| Operating Parameter | Technical Value |
|---|---|
| pH Compatibility | 5–9 |
| Filter Media | Phenolic or Acrylic Resin-Bonded Fibre |
| End Cap Options | DOE / SOE |
| Gasket and O-Ring Compatibility | NBR, EPDM, Viton, Silicone, PTFE |
Engineer's Note
- Senior Process Engineer
- 15+ Years of Field Experience
- Field-Test Approved
Thanks to their reinforced fibre matrix, resin-bonded cartridge filters provide stable depth filtration in processes with a high particle load. The structure bonded with phenolic or acrylic resin reduces deformation under high differential pressure and maintains filtration continuity.
The most common operational mistake with paints, resins, solvents and viscous chemical fluids is delaying filter replacement even though ΔP has reached a critical level. Differential pressure that stays high for a long time compacts the media and shortens service life. For optimum performance, keeping system flow at 70–75% of the filter’s capacity is recommended.
When should it be chosen?
Used in chemical processes with a high particle load, in filtering paints, resins, varnishes and solvents, and with high-viscosity liquids; also serves as a protective stage before final filtration.
Application and Selection Criteria
- Differential Pressure (ΔP) and Replacement Monitoring
- With high-viscosity fluids, monitor ΔP regularly; plan replacement at the critical pressure limit before the rigid matrix breaks down.
- Solvent and Elastomer Compatibility
- In solvent-based applications, confirm the chemical compatibility of the elastomer in advance so that the gasket and O-ring material do not react with the fluid.
- Gasket Selection with Aggressive Chemicals
- To ensure sealing on high-temperature and corrosive lines, FKM (Viton®) or PTFE-encapsulated gaskets should be chosen.
Industry Applications
Resin-bonded cartridge filters are used on paint, varnish, resin, ink, solvent, adhesive, petroleum derivative and high-viscosity chemical process lines. Thanks to their rigid fibre matrix impregnated with phenolic and acrylic resin, they keep their form under high differential pressure and in aggressive chemical environments, delivering stable, long-lasting filtration performance.
01
Vegetable Oil
Clarity, purity and shelf life in vegetable oil and refining.
Explore solutions
02
Pipe and Profile
Cooling water filtration in pipe and profile extrusion.
Explore solutions
03
Paint Industry
Surface quality and pigment filtration in the paint industry.
Explore solutions
04
Glass Industry
Furnace and process filtration in the glass industry.
Explore solutions
05
Dialysis Centers
Water preparation and process filtration in dialysis centers.
Explore solutions
06
Foundry Industry
Equipment protection and dust filtration in foundries.
Explore solutions
07
Industrial Oil
Filtration in industrial oil production and recovery.
Explore solutions
08
Energy and Biogas
Maximum efficiency and turbine protection in energy and biogas.
Explore solutions
09
Recycling
Filtration for efficiency and environmental compliance in recycling.
Explore solutions
10
Food and Beverage
Hygienic filtration in food and beverage.
Explore solutions
11
Pharmaceuticals and Biotechnology
GMP-compliant sterile filtration in pharmaceuticals and biotechnology.
Explore solutions
12
Paper and Packaging
Process water filtration in paper and packaging.
Explore solutions
13
Chemical Industry
Corrosion-resistant, safe filtration in the chemical industry.
Explore solutions
14
Cosmetics
Microbiological safety and precision filtration in cosmetics.
Explore solutions
15
Machinery
Precision and technical filtration in the machinery industry.
Explore solutions
16
Printing and Ink
Flawless color and print quality in printing and ink.
Explore solutions
17
Metal and Surface Treatment
Flawless surfaces and bath stability in metal and surface treatment.
Explore solutions
18
Forest Products
Resin and glue filtration in forest products and furniture.
Explore solutions
19
Automotive
Precision process filtration for zero defects in automotive manufacturing.
Explore solutions
20
Oil and Petrochemicals
Equipment protection and process safety in oil and petrochemicals.
Explore solutions
21
Plastic Packaging
Precision process filtration and raw material purity in plastic packaging.
Explore solutions
22
Plastic Injection Molding
Cooling and hydraulic filtration in plastic injection molding.
Explore solutions
23
Water and Environment
Recovery filtration in water and environmental technologies.
Explore solutions
24
Shipyards and Marine
Operational safety and efficiency in shipyards and marine.
Explore solutions
Products that work with this product
Resin-Bonded Cartridge Filter
Your Questions Answered
Frequently Asked Questions
At Prosestim, we are committed to answering your questions and providing technical support for our filtration solutions.
On my paint line, standard melt-blown filters keep loading early and deforming; will a resin-bonded filter solve this?
Yes, resin-bonded filters are designed for such lines. With high-viscosity liquids (paints, varnishes, resins), when differential pressure rises quickly in standard PP melt-blown filters, the fibre matrix compresses, the pore size shrinks and channels (bypass) form. At that point the filter loses its micron rating and dirty liquid starts to pass.
In resin-bonded filters, acrylic or phenolic resin fixes the fibres rigidly. Even at a differential pressure of 2.5 bar the structure does not break down; pore size and micron precision are maintained. The difference documented in the field is that, in the same process, a service life 3–4 times longer than with a standard filter is achieved. When you run at 70–75% of your flow capacity, this ratio increases further.
Resin-bonded or string-wound: which is right for my process?
The decision between the two depends on two questions: what is the liquid’s viscosity, and how high is the differential pressure?
A string-wound filter is sufficient: in applications requiring pre- and coarse filtration of low-viscosity liquids (water, dilute chemicals, oil-free condensate) under low ΔP conditions. The cost advantage is clear.
A resin-bonded filter is necessary: with paints, inks, varnishes, adhesives, crude oil or high-viscosity chemical liquids; on lines with pressure fluctuations; in processes where fibre migration (shedding) cannot be tolerated; and at final filtration stages that require reliable filtration below 10 µm.
A practical test: if the liquid flows like water at room temperature, string-wound is enough. If it pulls or leaves trails when you pour it, choose resin-bonded.
Acrylic or phenolic: which is right for solvent-based paint, ink and resin lines?
For solvent-based paint, ink and resin lines, phenolic resin is the first choice, because it shows high chemical resistance to toluene, xylene, white spirit, ethyl acetate and naphtha; the resin itself is thermally stable up to 121 °C, while the cartridge’s operating limit is 80 °C.
Choose acrylic resin for water-based fluids, mildly acidic processes (above pH 5) and inorganic salt solutions. Acrylic also works in solvent environments but is not as strong as phenolic and breaks down quickly in alkalis; even dilute NaOH can start hydrolysis. Lines with concentrated acids and oxidisers (nitric acid, hypochlorite, peroxide) are not suitable for either resin type.
If your line has both acids and solvents, choose phenolic, then confirm with a sample test.
Why does an acrylic filter break down in alkalis, and does phenolic break down too?
The acrylic-bonded structure undergoes chemical hydrolysis in alkaline environments: the bond structure weakens, the fibre matrix loosens and particle release begins. Even dilute NaOH can start this breakdown. Acrylic filters should therefore not be used on lines with alkaline cleaning (CIP) steps.
Phenolic resin, on the other hand, breaks down in strong alkalis (NaOH 50%+, concentrated KOH): the bonds in the resin matrix hydrolyse, the resin detaches from the fibre matrix and the pore structure breaks down. Phenolic has moderate resistance to dilute alkalis (ammonia, dilute NaOH); this is where the two resin types differ. The recommended operating range for both types is pH 5–9.
For filtering petroleum and its derivatives (fuel oil, crude oil, hydraulic oil), acrylic or phenolic?
Choose phenolic resin for all these applications. For mineral oils, hydraulic oil, fuel oil and crude oil, both resin types are rated Excellent (E) in the chemical compatibility table; the difference appears as temperature and solvent content increase. Both work with crude oil and refinery fluids; as the operating temperature approaches the 60–80 °C range, phenolic’s thermal advantage becomes clear.
Gasket selection is critical in this application: NBR is standard for mineral oil and hydraulic oil; switch to Viton if the aromatic hydrocarbon content is high. Silicone and EPDM swell in oil environments; do not use them.
If the filter's maximum operating temperature is 80 °C, what does 121 °C resistance mean?
These two values describe different operating conditions. The maximum operating temperature of 80 °C is the practical upper limit at which the filter can operate continuously and safely in process fluids.
121 °C, on the other hand, is the maximum structural thermal stability limit of the pure phenolic and acrylic resin media. However, because of the temperature limits of the gaskets/O-rings (EPDM, silicone, etc.) and end cap materials used in the field, 80 °C should not be exceeded in continuous liquid processes. In addition, because resin-bonded filters are not intended for food/pharmaceutical sterilisation, they are designed for use on solvent and chemical process lines rather than for steam sterilisation (SIP/autoclave).
Which filter and micron rating should be chosen for ink and printing processes (offset, flexo, gravure, inkjet)?
The standard approach for printing processes is staged filtration with phenolic resin. By application:
- Offset ink: Phenolic resin, 10–25 µm. A rigid structure is essential because of the high viscosity and pigment load.
- Flexo / gravure ink: Phenolic resin, 5–25 µm. Phenolic for solvent-based systems; either type may suit water-based ones.
- Inkjet / conductive ink: Very fine; 1–5 µm. There is no tolerance for fibre migration; a resin-bonded filter is mandatory, and standard melt-blown is not acceptable.
- UV-curing ink: Phenolic resin, 5–25 µm. With these inks containing monomers and oligomers, chemical compatibility must be completed with a Viton® O-ring.
When should I change my filter: on a fixed schedule or by differential pressure?
Replacement based on differential pressure (ΔP) gives more accurate results; a fixed schedule leads to both early and late replacement, and both are costly.
Practical thresholds for resin-bonded filters: recommended replacement ΔP of 2.0 bar; maximum ΔP of 2.5 bar. In this range the filter still works, but its life runs out quickly. Replace it when ΔP exceeds 2.0 bar; do not wait. Also replace it regardless of ΔP if you see a change of colour, turbidity or more particles in the outgoing liquid; this is a sign of micron loss.
Fit pressure gauges to the filter inlet and outlet. If you cannot, at least monitor the inlet pressure: at constant flow, a sudden pressure rise at the pump shows the cartridge is full.
Can I wash and reuse my resin-bonded filter?
No, attempting this creates a serious process risk. Resin-bonded filters perform depth filtration: particles penetrate into the inner layers of the matrix and stay there. Backwashing cannot remove these particles completely; it may release those near the surface, and they get into the filtrate.
There is also a clear technical limit: the reverse flow maximum is 2.1 bar, about half that of normal flow. Aggressive backwashing exceeds this limit and causes structural damage to the rigid resin matrix. If you are looking for a washable filter solution, consider woven-surface polypropylene or stainless steel cartridge filters; however, washable PP cartridges start at 50 µm and, because they perform surface filtration, their depth retention capacity is much lower.
What does running at 70–75% of flow capacity to extend service life mean, and how do I apply it?
A filter cartridge’s dirt-holding capacity is fixed; the amount of contamination passing per unit time determines how quickly that capacity is used. When you reduce the flow, two things happen: the flow velocity per unit surface falls and the filter loads more slowly, which extends service life disproportionately.
In practice: for example, if the max flow for a 10-inch cartridge is 30 L/min, run your system at 21–22 L/min. To do this you may need to throttle the pump or choose a longer cartridge (20″ or 30″). The second option is usually more economical, because although the cartridge costs more, change frequency and downtime fall significantly.
Resin-Bonded Cartridge Filter RFQ Configurator
Configure your variation dimensions and technical specifications to receive an instant quote directly on WhatsApp and via email.