Meta-aramid (Nomex class) filter bags, up to 204 °C.
Meta-aramid, sold under names such as Nomex, is a strong, abrasion-resistant filter bag media rated up to 204 °C continuous. It is the usual choice for asphalt plants, foundries and cement raw mills, where hot, abrasive dust needs a tough felt. It is sensitive to acid gases and moisture, so it is not used where SOx is high.
- Continuous temperature
- up to 204 °C
- Strengths
- Strength, abrasion and heat
- Main limit
- Acid gas and hydrolysis
- Surface option
- Ultra-microfibre layer
Where it works
- Asphalt mixing plants
- Foundry and metal dust
- Cement raw mills
- Hot, abrasive dust with low acid content
Where to avoid it
- Gas with high SOx or HCl
- Hot, very moist gas
- Continuous operation above 204 °C
Typical applications
Asphalt, foundry, cement raw mills, clinker coolers, metallurgical dust.
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.
Is Nomex the same as aramid?
Nomex is a brand name for meta-aramid fibre. Masturlal uses Nomex-class meta-aramid in its felts.
What temperature can aramid filter bags take?
Up to 204 °C continuous, with short peaks somewhat higher.
When should aramid not be used?
Avoid it where the gas carries acids such as SOx or HCl, or where hot gas is very moist. PPS or P-84 is usually used instead.
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.