SPS Bag Filter
Filtration Down to 0.5 µm in Chemically Demanding Viscous Liquids
The SPS bag filter is a process-specific three-layer polypropylene filter for retaining fine particles down to 0.5 µm in high-viscosity, chemically demanding liquids.
Three-Layer Lamination
0.5–0.8 µm (in high-viscosity liquids)
90 °C
Made to Process Requirements
What Is an SPS Bag Filter?
SPS bag filters are a three-layer liquid filtration medium with a polypropylene core layer between two outer spunbond layers. Whereas the SCS bag filter has a natural cotton core, the SPS uses a synthetic polypropylene core; this design gives safe operation and fine particle retention down to 0.5 µm in high-viscosity liquids containing acids, alkalis and many solvents. The outer spunbond layers stop fibre migration and prevent fibres from getting into the cleaned liquid, while the polypropylene core provides in-depth filtration with high dirt-holding capacity in chemically demanding processes.
SPS bag filters are not a standard product; each is made specifically for the process according to liquid type, viscosity, temperature and chemical profile. They are designed to meet critical filtration requirements in chemically aggressive, high-viscosity liquids where standard bag filters fall short.
Product Identity and Technical Summary
SPS bag filters are three-layer synthetic depth filters made by laminating two outer spunbond polypropylene layers with a polypropylene core layer in the middle. They offer operating temperatures up to 90 °C and resistance to acids, alkalis and solvents across the full pH 1–14 range, retaining particles at 0.5–0.8 µm in high-viscosity aggressive liquids. Their fully synthetic structure prevents fibre migration and preserves filtration efficiency.
Key Technical and Structural Features
- Construction
- Outer Layer: Spunbond Nonwoven Fabric
- Middle Layer: Polypropylene (PP) Core
- Inner Layer: Spunbond Nonwoven Fabric
- Outer Layers
- Spunbond Nonwoven Fabric — mechanical strength and protection against fibre migration
- Middle Layer
- Polypropylene (PP) — high dirt-holding capacity and chemical resistance across the full pH range
- Micron Rating
- 0.5–0.8 µm (in high-viscosity liquids; varies by process)
- Filtration Type
- Depth filtration
- Max. Operating Temperature
- 90 °C
- Chemical Resistance
- Compatible with acids, alkalis and many solvents across the full pH 1–14 range
- Recommended Change-Out Pressure
- 2–2.5 bar
- Silicone Content
- Silicone-free construction
- Production Type
- Made to order for each process
SPS Bag Filter Layer Structure
| Layer | Material | Function |
|---|---|---|
| Outer Layer (Inlet Surface) | Spunbond nonwoven fabric | Retains large particles as a pre-stage, protecting the PP core and providing mechanical strength. |
| Middle Layer | Polypropylene (PP) | Retains fine particles down to 0.5 µm in depth in high-viscosity liquids and provides high chemical resistance in the pH 1–14 range. |
| Inner Layer (Outlet Surface) | Spunbond nonwoven fabric | Stops fibres that may come loose from the PP layer from getting into the cleaned liquid and provides dimensional stability. |
Advantages of the SPS Bag Filter
- Sub-Micron Particle Retention
- Fine particle retention down to 0.5 µm in high-viscosity liquids, a level of precision standard bag filters cannot reach.
- Chemical Resistance Across the Full pH Range
- The PP core layer is compatible with acids, alkalis and many solvents across the full pH 1–14 range, overcoming the chemical limitations of the SCS cotton core.
- High Viscosity Compatibility
- Effective depth filtration in thick, heavy process liquids; works reliably in processes where standard media designed for low-viscosity liquids fall short.
- Fibre Migration Protection
- The spunbond outer layers stop fibres that may come loose from the PP core from getting into the cleaned liquid.
- Made to Process Requirements
- Made specifically according to liquid type, viscosity, temperature and chemical profile; non-standard requirements are met.
- Silicone-Free Construction
- A synthetic construction free of silicone and contaminating additives; can be used safely on sensitive process lines.
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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SPS 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 SPS bag filter?
It is a process-specific three-layer liquid filtration medium with a polypropylene middle layer between two outer spunbond layers. It offers particle retention down to 0.5 µm in high-viscosity liquids and chemical resistance across the full pH 1–14 range.
What is the difference between SCS and SPS?
Is it a standard stock product?
What is the operating temperature limit?
When should it be replaced?
What is needed for custom production?
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