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P84 Needle-Punched Felt Filter Bags for Dust Collection
- Continuous operating temperature: 260°C.
- Peak temperature resistance: 280°C–300°C.
- Glass transition temperature (Tg): 315°C.
- Collection efficiency for particles larger than 0.1 μm can reach 99.99%.
- PM2.5 capture efficiency exceeds 99.97%.
- Emission concentrations can be consistently maintained below 5–10 mg/m³.
- PH 2–12 environments.
- Acidic gases such as SO₂ and HCl.
- Alkaline dust conditions.
- Various organic solvent atmospheres.
- Limiting Oxygen Index (LOI) up to 38%.
- Does not melt or drip when exposed to flame.
- Under fire conditions, the fiber only carbonizes and shrinks.
- Low reverse-air or pulse cleaning pressure requirement.
- High dust cake release efficiency.
- Stable operating pressure differential.
- Reduced energy consumption and operating costs.
Description
P84 filter bags offer excellent high-temperature resistance, filtration efficiency, and chemical stability, making them particularly suitable for demanding operating environments—characterized by high temperatures, high corrosivity, and strict emission standards—where standard filter bags fall short.
Filmedia® is a professional manufacturer of dust collection filter bags. We supply diversified material filter bags with customized sizes and surface treatments, serving industrial dust removal systems across global industries with reliable quality and full technical support.
Base Fabric Material – P84 Needle Felt
P84 needle-punched felt is a high-performance filtration material manufactured from polyimide staple fibers through processes such as opening, carding, web formation, and needle punching. It is one of the most widely used filtration media in industrial high-temperature flue gas filtration—ranking alongside PTFE and fiberglass media—and is considered a mainstream solution for high-temperature dust removal. The unique cross-sectional shape of P84 fibers increases the effective filtration surface area, causing dust particles to be trapped primarily on the surface of the medium rather than penetrating deep into the felt structure; this results in excellent dust release properties, higher cleaning efficiency, lower operating pressure drop, and a significantly extended filter bag service life.
Physical Properties
| Air permeability(L/m2.s) @200pa | Tensile strength(N/5cm) | Temperature(℃ / ℉) | ||
| warp | weft | Operating | Ultimate | |
| 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 |
PTFE Membrane Lamination Treatment for P84 Filter Bags
☑ Achieves true surface filtration
☑ Improves filtration precision
☑ Reduces operating pressure drop
☑ Enhances cleaning efficiency
☑Extends filter bag service life
Conventional filter media allow dust particles to penetrate deep into the fiber structure during operation. Over time, dust accumulates within the pores, leading to pore blockage, increased pressure drop, reduced filtration efficiency, and ultimately shortened service life. By contrast, P84 filter bags laminated with a PTFE membrane provide true surface filtration. Dust particles are captured on the membrane surface rather than penetrating into the filter media, making them much easier to remove during cleaning cycles. This results in superior dust cake release, lower cleaning pressure requirements, longer cleaning intervals, and more stable operating performance.
Application Industries
Electric Power Industry
- Coal-fired power plants
- Circulating fluidized bed (CFB) boilers
- Biomass power generation boilers
Iron and Steel/Metallurgy Industry
- Sintering machine head dedusting
- Blast furnace cast house dedusting
- Converter flue gas treatment
Cement Industry
- Cement kiln tail dedusting
- Clinker coolers
- Drying systems
Chemical Industry
- Sulfuric acid plants
- Chlor-alkali plants
- Fertilizer plants