P84 Filter Bags

Description

P84 filter bags are a type of filter media commonly used in industrial applications, especially in air pollution control systems. They are resistant to high temperatures, have good corrosion resistance, and are acid resistant. Under the condition of 240℃, the mechanical properties of P84 polyimide fiber filter material will not change, and the maximum temperature resistance can reach 260℃. P84 fiber filter material has no melting point temperature and is naturally golden yellow. P84 polyimide fiber filter material is not a hygroscopic fiber filter material (at 65% relative humidity, about 3% water absorption).

Main Features

• High temperature resistance: Max. Operating temperature: 240℃/464℉; Ultimate temperature: 260℃/500℉.
• Excellent filtration efficiency: Due to it’s leaf-shaped cross section, It’s 80% increase in filtration area than other filter Media.
• Chemical stability: P84 material has good chemical stability and can resist erosion and corrosion from many chemicals, thereby extending the service life of the filter bags.

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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

Specification of P84 Filter Bags

Heat resistance℃/℉	Up to 260/500
Fabric	100% P84 fiber (polyimide)
Length & diameter	No limited
Area weight (g/m2)	350~700
Working lifetime	8000 hours and more
MOQ	50pcs

P84 Needle Felt Processing

To achieve enhanced filtration performance, P84 needle felt undergoes a series of specialized post-processing treatments to improve durability, filtration efficiency, and surface properties for demanding applications.

• Heat Setting

Heat setting is a thermal stabilization process performed under controlled temperature and tension.

• Calendering

Calendering is a mechanical finishing process in which the fabric surface is pressed between heated rollers.

• Singeing

Singeing involves briefly exposing the fabric surface to a controlled flame or high-temperature source.

• PTFE Membrane Lamination

PTFE membrane lamination involves bonding a microporous PTFE membrane to the surface of the needle felt.

• Water & Oil Repellent Treatment

This chemical finishing process applies hydrophobic and oleophobic agents to the fiber surface.

• Anti-Static Treatment

Antistatic properties can be achieved by incorporating conductive fibers or coating with a conductive chemical coating.

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Specialized Shape Filter Bag Manufacturing – Pleated P84 Filter Bags

Based on the specific structural designs and operational requirements of various dust collectors, Filmedia® designs and manufactures customized filter bags. Compared with conventional cylindrical filter bags, pleated P84 filter bags significantly increase filtration surface area within the same installation space, resulting in higher air-to-cloth ratios, improved dust capture efficiency, and reduced pressure drop. The pleated structure also enhances airflow distribution and helps extend service life by reducing surface loading intensity.

Filter Cages

Furthermore, we provide complementary support components—including precision-engineered filter cages—to ensure the comprehensive compatibility, operational stability, and extended service life of the entire filtration system.

 

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Application of  P84 Filter Bags

P84 filter bags are mainly used in flue gas purification in gypsum plants, cement plants, liquid fluidized bed boilers, coal-fired boilers and waste incineration processes, and are widely used in processes with high emission concentration requirements.

• Cement Production: In cement plants, P84 filter bags are used in dust collection systems to capture cement dust and other particulates generated during the production process.
• Metal Smelting and Foundries: They are utilized in metal smelting and foundry operations to filter out metal oxides, dust, and fumes produced during the melting and casting processes.
• Waste Incineration: Waste incineration plants use them in their filtration systems to control emissions of particulate matter and pollutants generated from burning waste materials.
• Power Generation: In thermal power plants, they are employed in boiler systems and flue gas cleaning units to remove ash and other particulates from the exhaust gases.
• Chemical and Pharmaceutical Industries: They are also used in chemical processing plants and pharmaceutical manufacturing facilities where there is a need to control emissions of fine particulates and hazardous substances.
• Incineration of Hazardous Waste: Facilities that incinerate hazardous waste materials rely on them to ensure compliance with environmental regulations by capturing hazardous particulates and preventing their release into the atmosphere.

Recommendations

• The hydrolysis and oxidation resistance of P84 filter bags are moderate. It is recommended that the water vapor content is less than 35% Vol and the O2 content is less than 16% Vol.
• Oxidized sulfides will shorten the service life of P84 bags. The oxidized sulfide content is recommended to be less than 700 mg/Nm3.
• Waste incinerators should be equipped with desulfurization devices.

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Filmedia® – P84 Filter Bag Manufacturer

Filmedia® is a professional manufacturer of high-performance industrial filter bags, specializing in advanced filtration solutions for demanding dust collection environments.

How does Filmedia® improve filtration efficiency and reduce production costs?

• To increase system filtration capacity by 50-150% as needed without major changes to the dust collectors.
• System cleaning efficiency markedly increased with the effective increase of bag to bag distance.
• Bag life extended due to significant reduction of fatigue damage to the bags due to bag to cage impact.

We Pay Attention to Every Processing Detail:

• Accurately design the size of the filter cloth required for the filter bag. The filter cloth will be larger than the actual design size to leave enough operating space.
• Choose the right filter bag accessories and check their quality.
• We draw, cut and sew the filter bags on an automatic production line. When the filter bag needs to be processed manually, we open it on the operating platform and use a certain pulling force to keep it flat.
• We maintain strict processing quality standards in accordance with design drawings and operating procedures. Our workers dress in compliance with safe construction requirements and are prohibited from smoking.