Filter Bag Media: P84

Industry Use

P84 (polymide) dust collector filter media displays excellent stability under dry high heat temperatures, has great filtration properties, and performs well even under elevated levels of moisture content. These are some of the reasons P84 is one of the more expensive filter medias used in pulse jet baghouse dust collectors. Industries that use P84 filter media range from waste to energy, power, and cement.

Dust Collection Characteristics

The stability of P84 filter media is a benefit to a wide variety of applications lime kilns, smelting, incinerators, coal fired boilers, and glass and ceramic industries. It can be utilized in operating conditions of a maximum 500 degrees Fahrenheit and offers a good resistance to mineral acids. If your baghouse is operating above 450 degrees Fahrenheit keep in mind that you may need to oversize the bag to account for the shrinkage that will occur at extreme temperatures. Media weight is typically available in 14, 16, and 18 ounces. Below are more of the characteristics of P84 filter media.

Characteristic	Rating
Relative Cost	$$$$$$
Max Continuous Operating Temperature	500 Degrees F.
Abrasion	Fair
Energy Absorption	Good
Filtration Properties	Excellent
Moist Heat	Good
Alkaline	Fair
Mineral Acids	Good
Oxygen (15%+)	Excellent

Pros	Cons
Excellent stability in applications with high dry heat temperatures, mineral acids, and alkaline.	Must oversize bag for shrinkage that can occur in temperatures above 450 Degrees F.

Applications
Waste-to-Energy
Coal Fired Boilers
Incinerators

Filter Bag Treatments & Finishes

• PTFE Membrane
• Singe
• Glazed

Benefits of Treatments & Finishes

PTFE Membrane: Applying a PTFE membrane will allow you to lengthen the life of your bag since the membrane acts as the filter cake. It would allow for very little dust to stick to the bag itself. As the dust stays on the surface of the membrane and does not get entrained into the fibers of the bag, this allows your filter to last twice as long. Other benefits include reduced wear and tear, savings on maintenance costs, reduced energy costs, and more.

Singe: A pre-treatment process that is achieved by passing the filter material over an open flame, removing any straggly surface fibers. The result is a uniform surface area that improves cake release.

Glazed: A pre-treatment process achieved by a high pressure pressing of the fiber at elevated temperatures. The fibers are fused to the body of the filter medium that improves mechanical stability.

Filter Bag Resources

To learn more about filter media, treatments, configurations, and air-to-cloth ratio download our filter bag eBook below.

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