The P84 filter bag is a flame‑retardant, high‑temperature‑resistant needle‑punched felt bag designed for dust collection. It adopts thermally stable P84 (polyimide) fiber as the filter media.
Common Sizes: 100 mm, 125 mm, 130 mm, 150 mm, 180 mm, 250 mm in diameter.
Manufacturing Processes: Automatic sewing or thermal welding.
Construction Features: Double‑layer bottom and reinforced design for enhanced abrasion resistance.
Sewing Thread Options: PTFE thread, polyester thread.
We also supply custom non‑standard filter bags. Should your required specifications differ from our standard range, kindly share your drawings and preferred material for quotation.
Description
Main Features
- High‑temperature resistance: Maximum continuous operating temperature: 240 °C / 464 °F; peak short‑term temperature tolerance: 260 °C / 500 °F.
- Superior filtration efficiency: Thanks to its unique leaf‑shaped cross‑section, P84 fiber delivers up to 80 % larger effective filtration area compared with conventional filter media.
- Outstanding chemical stability: P84 polyimide features robust chemical inertness against a wide range of chemical attacks, helping prolong the service life of filter bags.
Physical Properties
| Air permeability (L/m²·s) @200 Pa | Tensile strength (N/5 cm)‑warp | Tensile strength (N/5 cm)‑weft | Operating temperature (°C / °F) | Ultimate temperature (°C / °F) |
|---|
| 150‑300 | 1000 | 1100 | 220 / 428 | 260 / 500 |
Chemical Properties
| Acid Resistance | Alkali Resistance | Hydrolytic Resistance | Oxidation Resistance | Abrasion Resistance |
|---|
| Moderate | Moderate | Moderate | Good | Good |
P84 Filter Bag Specifications
| Item | Parameter |
|---|
| Max heat resistance | Up to 260 °C / 500 °F |
| Filter media | 100 % P84 (polyimide) needle‑punched felt |
| Length & Diameter | Custom‑made, no fixed restrictions |
| Basis weight | 350‑700 g/m² |
| Expected service life | 8000 operating hours or longer |
| MOQ | 50 pieces |
Post‑treatments for P84 Needle‑punched Felt
Specialised post‑processing is applied to P84 needle felt to optimise durability, filtration performance and surface characteristics for harsh industrial operating conditions.
Heat Setting
Heat setting is a thermal stabilisation procedure carried out under precise temperature and tension control to minimise thermal shrinkage.
Calendering
Calendering is a mechanical finishing technique where the felt surface is compressed between heated rollers for a smooth, compact surface.
Singeing
Singeing treats the felt surface with controlled high‑temperature flame exposure to burn off loose surface fibres, reducing dust adhesion.
PTFE Membrane Lamination
A microporous PTFE membrane is thermally bonded onto the felt substrate to achieve surface‑filtration performance and low pressure drop.
Water‑oil Repellent Treatment
Hydrophobic and oleophobic chemical agents are coated onto fibre surfaces to repel moisture and oily particulates.
Anti‑static Treatment
Anti‑static performance can be realised either by blending conductive fibres into the felt matrix or by applying conductive surface coatings.
Custom Special‑shape Filter Bags: Pleated P84 Filter Bags
FilterEXP develops custom‑engineered filter bags tailored to different dust collector configurations and site operating conditions.
When compared with standard cylindrical filter bags, pleated P84 filter bags greatly expand total filtration area within the same installation footprint. This enables higher air‑to‑cloth ratios, better dust‑collection efficiency and lower pressure drop. The pleated geometry also optimises air‑flow distribution and mitigates dust‑layer loading intensity, contributing to extended service life.
Filter Cages
We also supply matching filter cages with precise manufacturing workmanship. These supporting components guarantee full compatibility, stable running performance and longer service life for your complete dust‑filtration system.
Applications of P84 Filter Bags
P84 filter bags are widely deployed for flue‑gas purification across gypsum plants, cement plants, circulating fluidized‑bed boilers, coal‑fired boilers and waste incineration facilities. They are well‑suited for working conditions with stringent particulate emission requirements.
Cement Production
In cement manufacturing plants, P84 filter bags are fitted within dust collection systems to trap cement dust and various particulates generated throughout the production workflow.
Metal Smelting & Foundries
For smelting and foundry processes, these filter bags remove metal oxides, dust and toxic fumes released during metal melting and casting operations.
Municipal Waste Incineration
Waste‑to‑energy incineration plants adopt P84 filter bags in flue‑gas filtration systems to control particulate pollutants produced by waste combustion.
Power Generation
At thermal power stations, P84 filter bags are installed in boiler flue‑gas cleaning units to separate fly ash and fine particulates from exhaust streams.
Chemical & Pharmaceutical Industries
Chemical processing sites and pharmaceutical manufacturing plants utilize P84 filter bags for abating fine particulates and hazardous airborne emissions.
Hazardous Waste Incineration
Hazardous‑waste incineration facilities depend on P84 filter bags to capture dangerous particulates, helping facilities meet local environmental emission standards and prevent harmful substances from escaping into the atmosphere.
Operational Recommendations
P84 filter bags feature moderate resistance to hydrolysis and oxidation. For optimal service performance, it is recommended to maintain flue‑gas water‑vapour content below 35 % Vol, with oxygen concentration kept under 16 % Vol.
Oxidized sulphides accelerate material degradation and reduce the service life of P84 filter bags. The concentration of oxidized sulphides should be limited to below 700 mg/Nm³.
For waste incineration applications, desulphurisation equipment is strongly advised to be installed.
FilterExp – Professional Manufacturer of P84 Filter Bag
FilterExp is a professional manufacturer of high-performance industrial filter bags, focusing on the development and production of premium filtration solutions for harsh dust removal and flue gas filtration working conditions.
How does FilterEXP boost filtration efficiency and cut operational costs?
‑ Boost system filtration capacity by 50‑150 % without substantial modifications to existing dust collector equipment.
‑ Effectively enlarged spacing between filter bags greatly enhances system cleaning performance.
‑ Minimised impact between filter bags and cages reduces fatigue damage, which significantly prolongs filter bag service life.
We Focus on Every Production Detail
We precisely calculate and dimension filter cloth for each filter bag. Slight over‑sizing of the filter cloth is reserved to allow sufficient operational tolerance during installation and service.
Proper filter bag accessories are carefully selected and subjected to thorough quality inspection.
Filter bags are drafted, cut and sewn on fully‑automatic production lines. For items requiring manual handling, products are laid flat on work platforms under controlled tension to guarantee even fabric alignment.
We follow strict quality standards, manufacturing strictly per engineering drawings and standard operating procedures. All site personnel comply with safety regulations; smoking is prohibited within production areas.
