P-84 polyimide filter bags, up to 240 °C.
P-84 is a polyimide fibre with a trilobal cross-section that gives high fine-dust capture. It is rated up to 240 °C continuous, which makes it a leading choice for cement kiln and waste-to-energy pulse-jet baghouses. It costs more than PPS or aramid and is sensitive to hydrolysis in very moist gas, so it is often blended with other fibres.
- Continuous temperature
- up to 240 °C
- Fibre shape
- Trilobal, high surface area
- Main limit
- Hydrolysis in very moist gas; cost
- Forms
- 100% P-84 or P-84 blends
Where it works
- Cement kiln pulse-jet baghouses
- Waste-to-energy
- Fine dust with a tight emissions limit
- Temperatures between 200 and 240 °C
Where to avoid it
- Very high moisture at high temperature
- Strong alkaline conditions
- Low-temperature duty where cheaper media works
Typical applications
Cement kilns, waste-to-energy, lime kilns, high-temperature process gas.
How it compares
| Fibre | Continuous temperature | Strengths | Watch out for | Typical duty |
|---|---|---|---|---|
| Polyester | up to 150 °C | Low cost, good abrasion resistance | Hydrolysis in hot, moist gas | Cement mills, packing, crushers, general dedusting |
| PPS (Ryton) | up to 190 °C | Resists acids and alkalis | Oxidation at high O₂ | Coal-fired boilers, waste incineration |
| Meta-aramid (Nomex class) | up to 204 °C | Strong, abrasion resistant | Acid attack and hydrolysis | Asphalt, foundry, cement raw mills |
| P-84 polyimide | up to 240 °C | Trilobal fibre, fine-dust capture | Hydrolysis in very moist gas; cost | Cement kilns, waste-to-energy |
| Fibreglass | up to 260 °C | Highest temperature, chemically stable | Flex and abrasion; needs a finish | Reverse-air kilns, calciners, furnaces |
| Ultra-microfibre surface (13–15 µm) | set by base fibre | ≤5 mg/Nm³ with low pressure drop | Must be specified to the dust | Any of the above where emissions matter |
What to send for a recommendation
- Collector type (pulse-jet, reverse-air or shaker) and the collector drawing
- Bag diameter, length, top and bottom construction, and quantity
- Continuous and peak gas temperature
- Dust chemistry, moisture, acid dew point and particle size
- Current bag specification, bag life and differential pressure
- Emissions target
Questions, answered.
What is P-84 filter media?
P-84 is a polyimide fibre with a trilobal (three-lobed) cross-section. The shape gives more surface area, so fine dust is caught at the surface.
Is P-84 good for cement kilns?
Yes. Its 240 °C rating gives margin at typical kiln baghouse temperatures, and it captures fine kiln dust well. Gas moisture and chemistry should be checked first.
P-84 or fibreglass?
P-84 is usually preferred in pulse-jet collectors because it handles flexing better. Fibreglass is standard in reverse-air baghouses and handles up to 260 °C.
Send us your dust profile.
Temperature, chemistry, moisture, particle size and your emissions target. An application engineer replies within one working day, usually with a media specification within two.