Filter Bag Media: Polyester

Industry Use

Polyester is a widely available and relatively low cost filter bag media that offers great dimensional stability. This makes polyester filter media one of the most common types of filter media used in baghouse dust collection systems. Poly is used in a wide variety of industries such as food processing, manufacturing, woodworking, metalworking, and more.

Dust Collection Characteristics

Polyester’s maximum continuous operating temperature is 275 degrees Fahrenheit and has good overall qualities to resist abrasion and performs well with dry temperatures. You can see polyester available in 12, 14, and most commonly 16 ounces. Below are the common characteristics of polyester media.

Characteristic	Rating
Relative Cost	$
Max Continuous Operating Temperature	275 Degrees F.
Abrasion	Excellent
Energy Absorption	Excellent
Filtration Properties	Excellent
Moist Heat	Poor
Alkaline	Fair
Mineral Acids	Fair
Oxygen (15%+)	Excellent

Pros	Cons
Low cost and widely available filter media.	Does not perform well with moist heat.

Pros	Cons
Low cost and widely available filter media.	Does not perform well with moist heat.

Filter Bag Treatments and Finishes

There are a variety of treatments available for polyester. Finishes can include:

• PTFE membrane
• Hydro-oleophobic coating
• Acrylic,
• Anti-static (epitropic)

Pre-treatment processes can range from:

• Singe
• Glazed
• Calendered

Benefits of Treatments and Finishes

PTFE membrane: Can double the life of a standard filter bag, reduce wear and tear, reduce maintenance costs, reduce energy costs, and more.
Hydro- Oleophobic: Aids in filtration and adds resistance to water and oils.
Acrylic: Can help improve cake release and filtration efficiency in certain applications.
Anti-Static (epitropic): Helps ground the filter bag.
Singe: This removes straggly fibers which provides a uniform surface area and improved dust cake release.
Glazed: Fibers are fused to the body of the filter medium, which improves mechanical stability.
Calendered: This process flattens and smooths the filter medium. This can increase surface life, dimensional stability, and provides a more uniform fabric surface.

Filter Bag Resources

To learn more about filter bag media, construction, treatments and finishes, and air-to-cloth ratio you can download our filter bag eBook below. You can also watch our "Guide to Filter Media" video here.

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