As core filtering components in industrial solid-liquid and gas-solid separation systems, industrial filter bags come in a wide variety of types. Filter bags with different materials, structures and processes show significant differences in temperature resistance, chemical stability, mechanical performance, filtration accuracy, application scenarios and overall costs. Below is a detailed classification and professional difference analysis of mainstream industrial filter bags, covering material, structure, processing technology and functional categories. FilterWhale adopts targeted material selection and structural optimization for different working conditions to deliver stable and reliable industrial filtration solutions.
1. Classification by Filter Material
The filter bag material directly determines core performance indicators including temperature resistance, corrosion resistance, mechanical strength and filtration precision. The characteristics, application fields, advantages and limitations of common materials are listed as follows:
1.1 PET (Polyester) Filter Bags
Features: Maximum temperature resistance of 130°C, stable performance within pH 3–10, average hydrolysis resistance, and smooth surface for easy dust and impurity removal.
Applications: Normal-temperature flue gas dust removal in cement, steel and power industries; conventional liquid filtration in food and beverage processing.
Advantages: Low cost, high cost performance, excellent wear resistance and long service life.
Limitations: Not suitable for high-temperature environments and strong corrosive medium filtration.
1.2 PP (Polypropylene) Filter Bags
Features: Maximum temperature resistance of 90°C, full-range acid and alkali resistance (pH 1–14), outstanding hydrolysis resistance and superior chemical stability.
Applications: Liquid filtration for chemical, electroplating and pharmaceutical industries; food-grade filtration for beer, wine and other beverage products.
Advantages: Extreme corrosion resistance, recyclable utilization, smooth surface and low blocking rate.
Limitations: Poor temperature resistance, easy deformation under high-temperature conditions.
1.3 PPS (Polyphenylene Sulfide) Filter Bags
Features: Continuous temperature resistance up to 200°C, full pH corrosion resistance (pH 1–14), excellent hydrolysis and oxidation resistance.
Applications: High-temperature flue gas filtration for steel plants, waste incineration and coal-fired boilers; corrosive gas treatment in chemical industries.
Advantages: Excellent comprehensive performance with high temperature and corrosion resistance.
Limitations: Relatively high material cost, sensitive to excessive oxygen content in flue gas.
1.4 PTFE (Polytetrafluoroethylene) Filter Bags
Features: Maximum temperature resistance up to 260°C, full inert chemical performance with pH 0–14 corrosion resistance, extreme chemical stability and non-stick smooth surface for easy cleaning.
Applications: Ultra-clean filtration and emission treatment in chemical, pharmaceutical and semiconductor industries; high-temperature and strongly corrosive gas and liquid filtration.
Advantages: Superior resistance to high temperature, corrosion and oxidation, ultra-long service life.
Limitations: High material cost and complex processing technology.
1.5 Fiberglass Filter Bags
Features: Temperature resistance up to 280°C, adaptable to pH 3–11 medium environment, poor hydrolysis resistance, rough surface prone to dust adhesion.
Applications: High-temperature flue gas filtration for cement kilns and waste incinerators; usually combined with membrane lamination to improve cleaning efficiency.
Advantages: Outstanding high-temperature resistance and low manufacturing cost.
Limitations: Brittle texture, easy aging and damage, not applicable for humid working conditions.
1.6 Metal Fiber Filter Bags
Features: Ultra-high temperature resistance up to 600°C, excellent pressure resistance, corrosion resistance and mechanical strength, fully washable and reusable.
Applications: High-temperature and high-pressure gas filtration and catalyst recovery in metallurgy, chemical and power industries.
Advantages: Extreme temperature and pressure resistance, extremely long service life.
Limitations: Expensive cost and complicated processing procedures.
2. Classification by Structural Design
The structural design of filter bags determines filtration efficiency, dust cleaning effect and installation method, adapting to different space and working condition requirements.
2.1 Round Filter Bags
Features: Standard cylindrical structure, simple installation and large filtration area.
Applications: Most conventional industrial dust removal scenarios such as steel, cement and power plants.
Advantages: High standardization degree and low overall cost.
Limitations: Secondary dust rising may occur during ash cleaning.
2.2 Flat Filter Bags
Features: Flat profile with compact footprint and high filtering wind speed.
Applications: Space-limited scenarios such as marine and vehicle dust removal systems.
Advantages: Space-saving and flexible installation.
Limitations: Difficult ash cleaning and relatively high wear rate.
2.3 Diamond Filter Bags
Features: Diamond cross-section design with enlarged filtration area and optimized ash cleaning performance.
Applications: High-concentration dust filtration in metallurgy and chemical industries.
Advantages: Reduced cleaning frequency and extended service life.
Limitations: Higher processing cost than standard round bags.
2.4 Envelope Filter Bags
Features: Envelope-shaped structure with large opening for quick disassembly and replacement.
Applications: Scenarios requiring frequent filter bag replacement, such as food and pharmaceutical production.
Advantages: Minimized equipment downtime and convenient maintenance.
Limitations: Relatively smaller effective filtration area.
3. Classification by Processing Technology
Different manufacturing processes directly affect the filtration accuracy, surface performance and durability of industrial filter bags.
3.1 Needle Felt Filter Bags
Features: Three-dimensional interwoven fiber structure formed by needle punching process with compact texture and high filtration efficiency.
Applications: Most industrial dust removal and conventional liquid filtration scenarios.
Advantages: Stable filtration precision and long service cycle.
Limitations: Rough surface texture that easily adheres fine dust and impurities.
3.2 PTFE Membrane Laminated Filter Bags
Features: Composite structure with a uniform PTFE microporous membrane laminated on the base felt, featuring smooth surface and absolute surface filtration.
Applications: Ultra-clean emission treatment and high-precision filtration in chemical, pharmaceutical and fine processing industries.
Advantages: Ultra-high filtration efficiency, excellent self-cleaning performance and stable long-term operation.
Limitations: Higher cost; surface membrane is vulnerable to sharp object abrasion.
3.3 Anti-static Filter Bags
Features: Mixed conductive fibers eliminate static accumulation to prevent spark explosion risks.
Applications: Flammable and explosive dust filtration for grain processing, chemical powder production and other industries.
Advantages: Effectively ensure production safety and avoid explosion hazards.
Limitations: Conductive fibers are prone to wear and require regular inspection.
3.4 Water and Oil Repellent Filter Bags
Features: Special surface finishing provides hydrophobic and oleophobic performance to resist wet and oily dust adhesion.
Applications: Humid and oily dust filtration working conditions in metallurgy and chemical industries.
Advantages: Reduce cleaning frequency and extend filter service life.
Limitations: Additional surface treatment increases production cost.
4. Classification by Functional Characteristics
Functional filter bags are customized for specific harsh working conditions, targeting high temperature, strong corrosion, high precision and difficult cleaning scenarios.
4.1 High-temperature Resistant Filter Bags
Applications: High-temperature flue gas filtration for waste incineration, coal-fired boilers and high-temperature chemical pipelines.
Advantages: Stable operation under extreme high-temperature conditions to ensure continuous production.
Limitations: High material cost and strict requirement on flue gas oxygen content.
4.2 Corrosion Resistant Filter Bags
Features: Excellent acid and alkali resistance and chemical inertness, represented by PTFE and PP filter bags.
Applications: Corrosive gas and liquid filtration in chemical, pharmaceutical and electroplating industries.
Advantages: Effectively resist medium corrosion, reduce replacement frequency and lower operating costs.
Limitations: Part of corrosion-resistant materials have limited temperature resistance.
4.3 High-precision Filter Bags
Features: Ultra-fine filtration accuracy ≤1μm, mainly including membrane laminated bags and metal fiber filter bags.
Applications: Ultra-clean emission treatment and sterile high-purity filtration for semiconductor, pharmaceutical and fine chemical industries.
Advantages: Meet ultra-strict industrial emission and product purification standards.
Limitations: High cost and higher requirement for daily maintenance and cleaning.
4.4 Easy-clean Filter Bags
Features: Smooth non-stick surface or laminated membrane structure to prevent dust and impurity adhesion.
Applications: High-concentration dust and impurity filtration in metallurgy, chemical and industrial coating industries.
Advantages: Reduce cleaning times, save energy consumption and maintain stable flow rate.
