Product description
Polyester felt filter bag for industrial liquid filtration
The Polyester Felt Filter Bag is designed for industrial liquid filtration applications where reliable particle removal, mechanical strength and elevated temperature resistance are required. Compared to polypropylene felt, polyester felt offers improved thermal stability while maintaining consistent depth filtration performance.
This filter bag is widely used in industrial processes where operating conditions are more demanding or where longer service life is required under higher temperatures.
Filtration principle
The polyester felt filter bag operates using inside to outside depth filtration. Process liquid enters the bag, flows through the felt structure and exits the housing, while particles are retained throughout the thickness of the media.
This depth filtration principle provides:
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consistent particle retention
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good dirt holding capacity
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stable pressure drop behaviour
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reduced risk of surface clogging
All contaminants remain inside the filter bag, allowing clean and efficient disposal during change out.
Material characteristics
Polyester felt is known for its mechanical strength and resistance to elevated temperatures. It provides reliable filtration performance in a wide range of industrial liquid filtration applications.
Key material characteristics include:
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higher temperature resistance than polypropylene felt
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good resistance to acids and solvents
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fair resistance to alkalis
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good resistance to oxidising agents
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stable fibre structure during operation
These properties make polyester felt filter bags suitable for more demanding filtration environments.
Design and construction
Polyester felt filter bags supplied by Filtra International are manufactured to ensure consistent performance and reliable operation in industrial conditions.
Typical design features include:
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polyester felt depth filtration media
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finished surface to reduce fibre migration
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robust stitched or thermally bonded construction
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sealing ring options to minimise bypass
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compatibility with perforated or mesh support baskets
The sealing system ensures correct positioning in the housing and prevents unfiltered liquid bypass.
Available micron ratings
Polyester felt filter bags are available in a wide range of micron ratings, allowing precise selection based on process requirements.
Typical available ratings include:
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1 micron
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3 micron
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5 micron
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10 micron
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25 micron
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50 micron
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100 micron
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200 micron
Standard sizes
Polyester felt filter bags are supplied in standard industrial sizes to ensure compatibility with common bag filter housings.
Typical sizes include:
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Size 1
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Size 2
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Size 3
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Size 4
Custom sizes are available on request.
Operating limits
Typical operating limits for polyester felt filter bags include:
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maximum operating temperature up to 120 °C
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maximum continuous operating temperature up to 140 °C
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maximum differential pressure up to 2.5 bar
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recommended change out differential pressure around 1.5 bar
Exact limits depend on operating conditions and application specifics.
Typical applications
Polyester felt filter bags are commonly used in:
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chemical processing
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industrial water treatment
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surface treatment processes
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paint and coating systems
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inks and pigments
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food and beverage pre filtration
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process water filtration
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general industrial liquid filtration
Key benefits
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Reliable depth filtration performance
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Higher temperature resistance than polypropylene felt
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Good mechanical strength
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Stable pressure behaviour
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Wide range of micron ratings and sizes
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Cost effective and easy to replace
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Compatible with standard bag filter housings
Configuration and quotation
Polyester felt filter bags are supplied based on application requirements. Selection parameters include:
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micron rating
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bag size
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sealing ring type
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operating conditions
Filtra International provides technical support to ensure correct filter bag selection for optimal filtration performance and service life.