Multifilament Polypropylene Bag Filter
pH 1–14 Chemical Compatibility, 75–1500 µm and Economical Coarse Filtration
The multifilament polypropylene bag filter is an economical coarse liquid filter providing surface filtration in the 75–1500 µm range and wide chemical compatibility.
100% Multifilament Polypropylene
75–1500 µm
82 °C (180 °F)
pH 1–14
What Is a Multifilament Polypropylene Bag Filter?
Multifilament polypropylene bag filters are a woven liquid filtration medium made by processing yarn, formed by twisting several fine polypropylene filaments, on precision looms. They work on the surface filtration principle; particles are retained on the woven surface and in the spaces between the filaments. They share the same structural logic as multifilament polyester; the main difference lies in the material properties: polypropylene offers wider chemical resistance than polyester to acids and
alkalis across the full pH 1–14 range.
The most notable advantage of multifilament polypropylene bag filters is that they combine wide chemical compatibility with an economical cost structure. In applications with acid- and alkali-containing process liquids where polyester falls short, the PP woven bag is an economical and reliable alternative. However, its operating temperature limit (82 °C) is significantly lower than that of polyester (135 °C); if temperature is the limiting factor, polyester multifilament should be chosen.
Product Identity and Technical Summary
Multifilament polypropylene (PPMU) bag filters are an economical surface filtration medium made by twisting and weaving many fine polypropylene filaments. They retain coarse and medium solids in the 75–1500 µm range at high flow with low pressure loss, while providing high chemical resistance to acids and alkalis across the full pH 1–14 range. They offer operating temperatures up to 82 °C and, with their food-compatible silicone-free construction, are used safely on sensitive process lines.
Key Technical and Structural Features
- Material
- 100% Multifilament Polypropylene Filter Fabric
- Micron Rating
- 75 · 100 · 150 · 200 µm
- 250 · 300 · 400 · 600 µm
- 800 · 1000 · 1200 · 1500 µm
- Filtration Type
- Surface filtration (nominal filtration)
- Max. Operating Temperature
- 82 °C (180 °F)
- Chemical Resistance
- High chemical compatibility with acids, alkalis and many solvents in the pH 1–14 range.
- Recommended Change-Out Pressure
- 2–2.5 bar
- Food Compatibility
- Suitable for food contact
- Silicone Content
- Silicone-free construction
- Seam Construction
- Industrially Stitched
- Ultrasonically Welded
Collar Types and Adapters
Plastic Ring (PP Ring)
Polypropylene ring, stitched or welded. Used where full chemical resistance is required.
Steel Ring (Snap Ring)
Galvanised or stainless steel ring. The most widely used, economical standard collar.
Drawstring
Can be tied manually to any pipe outlet or special hanger with the drawstring.
Plastic Flange (Flange Top)
The plastic collar gives very high sealing. Suitable for high-pressure systems.
Plain Top
Has no ring; suitable for machines with a special clamping device.
Snap Ring (Snap Band)
The flexible steel band clicks into its seat. Allows fast change-outs.
Advantages of the Multifilament Polypropylene Bag Filter
- Chemical Resistance Across the Full pH Range
- Compatibility with acids, alkalis and many solvents across the full pH 1–14 range; works reliably in corrosive liquids where polyester multifilament bags fall short.
- Cost-Effective
- A clear cost advantage when its wide chemical compatibility is compared with high-cost alternatives; low operating costs in applications that require coarse filtration.
- Wide Micron Range
- Wide micron options from 75 to 1,500 µm, adaptable to different coarse filtration needs.
- High Dirt-Holding Capacity
- The spaces between the filaments of the multifilament structure provide higher dirt-holding capacity than monofilament.
- Food Compatibility
- Food-contact-compliant silicone-free construction; can be used safely in food and beverage applications.
- Low Pressure Drop
- The open-pore woven surface gives a low pressure drop at high flow rates.
Industry Applications
Bag filters suited to different process needs are used across a wide range of industrial applications to protect product quality, protect equipment and support 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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Multifilament Polypropylene 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 a multifilament polypropylene bag filter?
It is an economical surface filtration bag made by twisting and weaving many fine polypropylene filaments, with high chemical resistance in the pH 1–14 range.
How does it differ from polyester multifilament?
What is the operating temperature limit?
Can it be washed and reused?
It can be washed to a limited extent; however, the pore geometry of the multifilament structure cannot be fully recovered after washing. Monofilament bags are more suitable for reuse.
Can it be used in food applications?
Which micron rating should I choose?
It is selected according to the smallest particle size to be retained. For critical applications that require an exact micron cut-off, a monofilament bag should be used.
Do you manufacture custom sizes?
Yes, custom production is available in non-standard size and micron combinations.
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