SCS Bag Filter
Filtration Down to 0.5 µm and Oil Retention in Oily and Viscous Liquids
The SCS bag filter is a process-specific three-layer liquid filter that retains fine particles down to 0.5 µm and absorbs free oil in dense, oil-containing process liquids.
Three-Layer Lamination
0.5–0.8 µm (in dense liquids)
90 °C
Made to Process Requirements
What Is an SCS Bag Filter?
SCS bag filters are a three-layer liquid filtration medium with a natural cotton core layer between two outer spunbond layers. The outer spunbond layers stop fibre migration from the cotton layer, preventing fibres from getting into the cleaned liquid, and also give the medium dimensional stability and mechanical strength. The middle cotton layer retains fine particles down to 0.5 µm in depth in dense liquids, while its naturally lipophilic structure also absorbs non-emulsified free oil particles.
SCS bag filters are not a standard product; each is made specifically for the application according to process parameters (liquid type, viscosity, temperature, contaminant profile). They are chosen for critical applications in oils and similar dense liquids that require a fine particle retention capacity standard bag filters cannot reach. This hybrid design, combining solids retention and free oil removal in a single product, is engineered to meet special filtration requirements.
Product Identity and Technical Summary
SCS bag filters are three-layer hybrid depth filters made by laminating two outer spunbond nonwoven polypropylene layers with a natural cotton core in the middle. They offer operating temperatures up to 90 °C, and the lipophilic structure of the natural cotton core provides particle retention at 0.5–0.8 µm and free oil absorption in high-viscosity, oily process liquids. The outer spunbond layers stop cotton fibres from getting into the cleaned liquid, giving high surface smoothness and clarity.
Key Technical and Structural Features
- Construction
- Outer Layer: Spunbond Nonwoven Fabric
- Middle Layer: Natural Cotton Core
- Inner Layer: Spunbond Nonwoven Fabric
- Outer Layers
- Spunbond nonwoven fabric; provides mechanical strength and helps prevent fibre migration.
- Middle Layer
- Natural cotton provides high dirt-holding capacity and lipophilic oil absorption.
- Micron Rating
- 0.5–0.8 µm (in dense liquids; varies by process)
- Filtration Type
- Depth filtration
- Max. Operating Temperature
- 90 °C
- Recommended Change-Out Pressure
- 2–2.5 bar
- Chemical Resistance
- Moderate resistance to common acids and alkalis; limited resistance to strong solvents.
- Silicone Content
- Silicone-free natural structure
- Usage Type
- Single use
SCS Bag Filter Layer Structure
| Layer | Material | Function |
|---|---|---|
| Outer Layer (Inlet Surface) | Spunbond nonwoven fabric | Retains large particles as a pre-stage, protecting the cotton core and providing mechanical strength. |
| Middle Layer | Natural Cotton | Retains fine particles down to 0.5 µm in depth in dense liquids; absorbs free oil particles with its naturally lipophilic structure. |
| Inner Layer (Outlet Surface) | Spunbond nonwoven fabric | Stops fibres that may come loose from the cotton layer from getting into the cleaned liquid and provides dimensional stability. |
Advantages of the SCS Bag Filter
- Sub-Micron Particle Retention
- Fine particle retention down to 0.5 µm in dense liquids, a level of precision standard bag filters cannot reach.
- Dual-Function Filtration
- Both solids retention and absorption of non-emulsified free oil in a single product, reducing the need for a separate filtration stage.
- Fibre Migration Protection
- The spunbond outer layers stop fibres that may come loose from the cotton core from getting into the cleaned liquid.
- Made to Process Requirements
- Made specifically for each application according to liquid type, viscosity, temperature and contaminant profile; non-standard requirements are met.
- Dimensional Stability
- The spunbond layers stop the cotton core from losing shape when wet; the filtration surface stays stable throughout operation.
- Silicone-Free Natural Structure
- A construction free of silicone and contaminating additives; can be used safely in sensitive and food-contact applications.
Industry Applications
Bag filters suited to different process needs are used across a wide range of industrial applications to protect product quality and production continuity.
01
Vegetable Oil
Clarity, purity and shelf life in vegetable oil and refining.
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02
Pipe and Profile
Cooling water filtration in pipe and profile extrusion.
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03
Paint Industry
Surface quality and pigment filtration in the paint industry.
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04
Glass Industry
Furnace and process filtration in the glass industry.
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05
Dialysis Centers
Water preparation and process filtration in dialysis centers.
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06
Foundry Industry
Equipment protection and dust filtration in foundries.
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07
Industrial Oil
Filtration in industrial oil production and recovery.
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08
Energy and Biogas
Maximum efficiency and turbine protection in energy and biogas.
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09
Recycling
Filtration for efficiency and environmental compliance in recycling.
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10
Food and Beverage
Hygienic filtration in food and beverage.
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11
Pharmaceuticals and Biotechnology
GMP-compliant sterile filtration in pharmaceuticals and biotechnology.
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12
Paper and Packaging
Process water filtration in paper and packaging.
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13
Chemical Industry
Corrosion-resistant, safe filtration in the chemical industry.
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14
Cosmetics
Microbiological safety and precision filtration in cosmetics.
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15
Machinery
Precision and technical filtration in the machinery industry.
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16
Printing and Ink
Flawless color and print quality in printing and ink.
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17
Metal and Surface Treatment
Flawless surfaces and bath stability in metal and surface treatment.
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18
Forest Products
Resin and glue filtration in forest products and furniture.
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19
Automotive
Precision process filtration for zero defects in automotive manufacturing.
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20
Oil and Petrochemicals
Equipment protection and process safety in oil and petrochemicals.
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21
Plastic Packaging
Precision process filtration and raw material purity in plastic packaging.
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22
Plastic Injection Molding
Cooling and hydraulic filtration in plastic injection molding.
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23
Water and Environment
Recovery filtration in water and environmental technologies.
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24
Shipyards and Marine
Operational safety and efficiency in shipyards and marine.
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SCS Bag Filter
Your Questions Answered
Frequently Asked Questions
At Prosestim, we are committed to answering your questions and providing technical support for our filtration solutions.
What is an SCS bag filter?
Why choose SCS over a standard bag filter?
Is it a standard stock product?
No, SCS bag filters are made to order for each process. They are manufactured specifically according to liquid type, viscosity, temperature and contaminant profile.
How does it retain oil?
The naturally lipophilic structure of the cotton middle layer absorbs non-emulsified free oil particles. This mechanism does not work in processes containing emulsified oil.
What is the operating temperature limit?
When should it be replaced?
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