Filter Bag Material Selection by Flue Gas Temperature
Engineering Guide · Selection Guides
Filter bag material is selected by first narrowing candidates by flue gas temperature, then making the final choice based on acid gas, moisture, oxygen and alkali conditions. Enter your conditions below to rate each material Suitable, Caution or Not suitable, based on the Micro-one DuraFill™ material guide.
| Material | Continuous Temp. | Peak (Surge) Temp. | Acid Resistance | Alkali Resistance | Typical Applications |
|---|---|---|---|---|---|
| Polypropylene (PP) | 77–93°C | 93–110°C | Excellent | Excellent | Chemical and food processing, low-temperature moist dust |
| Acrylic (Homopolymer) | 125–127°C | 140°C | Very good | Fair | Spray dryers, low-temperature moist gas |
| Polyester (PET) | 130–150°C | 150–180°C | Good | Fair | General dust collection at ambient temperature (cement raw materials, wood, feed) |
| Meta Aramid (Nomex®) | 190–200°C | 218–240°C | Good | Good | Asphalt plants, hot abrasive dust |
| PPS | 190°C | 200–218°C | Excellent | Very good | Coal-fired boilers, gas near the dew point or high in moisture |
| Polyimide (P84) | 216–260°C | 232–260°C | Very good | Fair | Cement kilns, hot low-pH gas |
| PTFE | 232–260°C | 260–280°C | Excellent | Excellent | Waste incinerators, chemical processes, humid and strongly acidic gas |
| Fiberglass | 260°C | 288°C | Good | Fair | High-temperature gas, carbon black |
Ratings rank Excellent > Very good > Good > Fair. Temperatures are for dry gas and vary with the fabric specification. Polyester hydrolyzes at high temperature and moisture, PPS is vulnerable to high O₂ and NO₂, P84 to alkalis at high temperature, and fiberglass to hydrogen fluoride (HF) and flex abrasion. This chart is a starting point; the final selection should take dust properties and site conditions into account.
Where flue gas is humid and strongly acidic, as in waste incinerators, PTFE is the usual choice because its acid and alkali resistance are both rated Excellent. The typical applications listed in the chart reflect the same logic.
No. At the same temperature, bag life varies widely with acid gas, moisture, oxygen, alkali and HF conditions. Narrow the candidates by temperature, then make the final choice based on gas conditions.
Yes. An ePTFE membrane is laminated onto the surface of the filter media and adds surface filtration regardless of which felt it is applied to. Select the felt for temperature and gas conditions, and the membrane for emission limits and differential pressure control.
By the Micro-one R&D Center · Last updated November 1, 2026 · All Engineering Guide pages →
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