P84 Filter Bags & Polyimide Filter Bags
P84 Needle Felt • P84/PTFE Blend • P84 Membrane Filter Bag
ECOGRACE P84 filter bags (polyimide fiber) deliver superior high-temperature filtration at up to 240°C continuous operation. The unique trilobal fiber cross-section provides 80% more surface area than round fibers, enabling exceptional dust cake release, lower pressure drop, and longer service life in cement plants, waste incineration, steel mills, and asphalt mixing applications.
Trilobal Fiber Shape
Excellent Acid Resistance
ISO 9001 Certified
P84 Filter Bag Products
ECOGRACE manufactures a complete range of P84 polyimide filter bags in pure P84, blended, and membrane-laminated configurations to optimize performance and cost for your specific dust collection application.
Why P84 Polyimide Fiber? The Trilobal Advantage
P84 polyimide fiber features a unique trilobal (multi-lobal) cross-section that sets it apart from all other filter media fibers. This irregular shape creates 80% more surface area per fiber compared to round cross-section fibers like PPS or standard polyester.
More Fiber Surface Area
The trilobal cross-section provides 80% more filtration surface per fiber than round fibers. This means higher dust capture efficiency at the same media weight and thickness.
Lower Residual ΔP
The irregular fiber shape creates a loose, open felt structure that resists compaction. P84 filter bags maintain 30% lower residual pressure drop than PPS bags over their service life.
Superior Cake Release
Dust particles bridge across the trilobal fiber tips rather than embedding deeply into the felt. This surface loading pattern allows easier pulse-jet cleaning and lower cleaning pressure.
Extended Service Life
Lower cleaning stress and resistance to chemical attack result in P84 filter bag service life of 2–4 years in cement and incineration applications, reducing total cost of ownership.
P84 Filter Bag Industry Applications
P84 polyimide filter bags are specified in industries where high temperature, complex gas chemistry, and strict emission limits require superior filter media performance.
Cement Plants
Cement kiln and clinker cooler baghouse filtration. P84 filter bags handle the high temperature (200–240°C), abrasive cement dust, and acid gas cocktail (SO2, HCl, HF) simultaneously.
- ✓Kiln tail baghouse: 200–240°C
- ✓Clinker cooler filtration
- ✓Raw mill and coal mill dedusting
- ✓Emission <10 mg/Nm³ achievable
Waste Incineration
Municipal solid waste (MSW) and hazardous waste incinerators with complex flue gas containing acid gases, heavy metals, dioxins, and high moisture content.
- ✓Resistant to HCl, HF, SO2, NOx
- ✓Activated carbon injection compatible
- ✓Dioxin adsorption filtration
- ✓Meets EU WID / EPA MACT standards
Steel & Metal Smelting
Sintering machine head, electric arc furnace (EAF), and smelting furnace filter bag applications with high-temperature metal fume and acid gas challenges.
- ✓Sintering head dedusting: 180–220°C
- ✓Electric arc furnace fume filtration
- ✓Ferro-alloy smelting dust collection
- ✓Metal oxide fume capture
Asphalt Mixing Plants
P84 filter bags excel in asphalt plant baghouse systems where hot bitumen vapors, fine mineral dust, and moisture create challenging filtration conditions.
- ✓Drum dryer exhaust: 160–200°C
- ✓Resists bitumen condensation
- ✓Handles RAP recycled material
- ✓Easy cleaning of oily dust
Power Generation
Coal-fired, biomass, and waste-to-energy power plant baghouse applications requiring reliable high-temperature filtration with low pressure drop for fan energy savings.
- ✓CFB boiler baghouse filtration
- ✓Biomass co-firing applications
- ✓SO3 acid dew point resistance
- ✓Fly ash with high free CaO
Carbon Black & Chemical
Carbon black production tail gas filtration and chemical reactor vent dedusting where fine particles and acid gas coexist at elevated temperatures.
- ✓Carbon black tail gas: 200–230°C
- ✓TiO2 chloride process filtration
- ✓Calcium carbide dust collection
- ✓Silicon carbide / alumina recovery
P84 Filter Bag vs Other High-Temperature Filter Media
Choosing between P84, PPS, PTFE, and fiberglass filter bags depends on your operating temperature, gas chemistry, and budget. This comparison highlights P84’s unique advantages.
| Property | P84 (Polyimide) | PPS (Ryton) | PTFE (Teflon) | Fiberglass |
|---|---|---|---|---|
| Max Continuous Temp | 240°C | 190°C | 260°C | 260°C |
| Fiber Cross-Section | Trilobal (irregular) | Round | Round | Round |
| Dust Cake Release | Excellent | Good | Good | Fair |
| Acid Resistance | Good | Excellent | Excellent | Fair |
| Alkali Resistance | Fair | Good | Excellent | Poor |
| Hydrolysis Resistance | Fair–Good | Good | Excellent | Excellent |
| Abrasion Resistance | Good | Good | Good | Poor |
| Residual Pressure Drop | Lowest | Medium | Medium | High |
| Service Life | 2–4 years | 2–3 years | 3–5 years | 2–3 years |
| Cost Level | High | Medium | Highest | Low–Medium |
| Best For | Cement, incineration, steel | Coal boilers, low-oxygen | Extreme chemical | High temp, low acid |
P84 Filter Bag Technical Specifications
Standard specifications for ECOGRACE P84 polyimide filter bags across different product configurations.
| Parameter | 100% P84 | P84/PTFE Blend | P84 + Membrane |
|---|---|---|---|
| Fiber Content | 100% P84 | P84 50–70% + PTFE 30–50% | P84 substrate + ePTFE |
| Weight (g/m²) | 500–650 | 550–700 | 500–600 + membrane |
| Thickness (mm) | 1.6–2.2 | 1.8–2.4 | 1.6–2.0 |
| Air Permeability (m³/m²/min) | 12–18 | 10–16 | 4–8 (membrane restricted) |
| Tensile Strength – MD (N/5cm) | ≥800 | ≥900 | ≥800 |
| Tensile Strength – CD (N/5cm) | ≥1000 | ≥1100 | ≥1000 |
| Max Continuous Temp (°C) | 240 | 240 | 240 |
| Max Surge Temp (°C) | 260 | 260 | 260 |
| Surface Treatment | Singeing + Calendering | Singeing + Heat Setting | ePTFE Lamination |
| Outlet Emission | <20 mg/Nm³ | <15 mg/Nm³ | <5 mg/Nm³ |
| Available Diameters (mm) | 120, 130, 150, 160, 200, 250, 300 (custom available) | ||
| Available Lengths (m) | 2.0 – 10.0 (custom to your baghouse dimensions) | ||
Why Choose ECOGRACE P84 Filter Bags
As an experienced P84 filter bag manufacturer, ECOGRACE provides engineering expertise, premium quality, and competitive factory-direct pricing for projects worldwide.
Premium P84 Fiber Source
We use only genuine Evonik P84® polyimide fiber — no substitute or recycled materials. Batch traceability and fiber certification provided with every order of P84 filter bags.
Application Engineering
Our engineers analyze your process conditions (temperature profile, gas composition, dust properties) to recommend the optimal P84 filter bag configuration — pure P84, blended, or membrane.
Factory-Direct Pricing
Buy direct from our production facility — 30–50% savings versus Western OEM brands. Transparent pricing with no hidden costs. Volume discounts for large baghouse projects.
Quality Assured
ISO 9001 certified production. Every batch tested for weight, thickness, air permeability, and tensile strength. Full test certificates and inspection reports included with shipment.
How to Order P84 Filter Bags
Simple 4-step process from inquiry to delivery.
Submit Inquiry
Send bag dimensions, quantity, operating temperature, gas composition, and dust type. Include existing bag specifications if replacing.
Technical Review
Our engineers evaluate your process data and recommend the optimal P84 media type, weight, and surface treatment for maximum service life.
Sample & Quotation
Detailed quotation with delivery schedule. Sample bags (1–5 pcs) available for your lab testing and material qualification.
Production & Delivery
Production with full QC at every stage. Shipped worldwide with test certificates, packing list, and installation guidance.
Frequently Asked Questions
Common questions about P84 filter bags and polyimide filter bags for industrial dust collection.
What is a P84 filter bag?
A P84 filter bag is a high-temperature dust collection filter bag made from polyimide fiber (brand name P84® by Evonik). P84 fiber has a unique trilobal (irregular multi-lobal) cross-section that provides 80% more surface area than standard round fibers. This gives P84 filter bags superior dust cake release, lower residual pressure drop, and higher filtration efficiency at temperatures up to 240°C continuous / 260°C surge.
What is the maximum temperature for P84 filter bags?
P84 filter bags can operate continuously at 240°C and withstand short-term temperature surges up to 260°C. This positions P84 between PPS (max 190°C) and PTFE/fiberglass (max 260°C) in the temperature hierarchy, making it ideal for cement kilns, waste incineration, and steel sintering applications that typically operate at 200–240°C.
What is the advantage of P84 trilobal fiber shape?
The trilobal cross-section of P84 fiber provides three key advantages: 1) 80% more surface area per fiber than round fibers, increasing dust capture; 2) Superior dust cake release — particles bridge across fiber tips rather than embedding, enabling easier pulse cleaning; 3) Lower residual pressure drop — the irregular shape resists felt compaction over time, maintaining open pore structure throughout the bag’s service life.
P84 vs PPS filter bags — which should I choose?
Choose P84 filter bags when: operating temperature exceeds 190°C; you need superior dust cake release; or working with sticky/fine particles. Choose PPS filter bags when: temperature is below 190°C; excellent acid resistance is primary requirement; or budget is a constraint. For temperatures 190–240°C with acid gas, consider P84/PTFE blended filter bags for the best balance of performance.
How long do P84 filter bags last?
P84 filter bags typically last 2–4 years depending on operating conditions. In cement kiln applications, 2–3 years is common. In waste incineration with proper temperature control, 3–4 years is achievable. The trilobal fiber’s resistance to compaction means P84 bags maintain low pressure drop throughout their service life, unlike PPS bags which tend to blind progressively.
Can you supply P84 filter bags for my existing baghouse?
Yes, ECOGRACE manufactures P84 filter bags in any custom size to fit your existing baghouse. Provide your current bag dimensions (diameter, length, top/bottom type) or the baghouse model number, and we produce exact-fit replacements. Standard lead time is 3–5 weeks. Common sizes in stock for immediate shipment.
What is the price of P84 filter bags?
P84 filter bag prices vary by size, media weight, and configuration. As a guide: 100% P84 bags typically cost 2–3x the price of PPS bags for the same dimensions. P84/PTFE blended bags cost slightly more. The higher upfront cost is offset by longer service life and lower operating pressure drop (energy savings). Contact us with your specifications for factory-direct competitive pricing.
Get a Quote for P84 Filter Bags
Send us your baghouse specifications and our engineers will recommend the optimal P84 filter bag solution with factory-direct pricing