Need a filter bag that survives 200°C continuous heat, resists abrasion, and lasts 3–5 years in cement kilns or steel plants? Nomex filter bags (meta-aramid needle felt) are the industry gold standard for mid-to-high temperature baghouse applications.
What is a Nomex Filter Bag?
Nomex® is DuPont’s trademarked meta-aramid fiber (poly(m-phenylene isophthalamide)). When needle-punched into a nonwoven felt, it becomes Nomex filter cloth – the base material for high-temperature filter bags.
- Continuous operating temperature: 200°C (392°F)
- Surge temperature: 240°C (464°F)
- LOI (Limiting Oxygen Index): 29% – inherently flame retardant
- Acid resistance: Good (better than polyester, weaker than PTFE)
- Alkali resistance: Fair
- Hydrolysis resistance: Poor (avoid high moisture + heat)
Pro tip: For wet/acidic gases, pair Nomex with PTFE membrane lamination for 99.99% efficiency and easy cake release.
Key Specifications of Nomex Needle Felt
| Property | Value |
|---|---|
| Weight | 450–600 g/m² (standard 500 g/m²) |
| Thickness | 1.8–2.2 mm |
| Air Permeability | 120–200 L/dm²/min @ 200 Pa |
| Tensile Strength (Warp/Weft) | >900 N / >1100 N (5 cm) |
| Filtration Efficiency | 99.5%+ (with membrane: 99.99%) |
| Bag Sizes | Φ120–160 mm × 3000–8000 mm (custom) |
| Cage Fit | Snap-band, double beaded gasket, raw top |
Data based on 500 g/m² Nomex needle felt – contact us for custom spec sheets.
Top 5 Applications for Nomex Filter Bags
- Asphalt Mixing Plants – Handles hot bitumen fumes at 180–200°C
- Cement Kiln Bypass & Clinker Coolers – Abrasive dust + high temp
- Steel & Ferroalloy Furnaces – Metal fumes, sparks, abrasion
- Carbon Black Production – Fine powders, consistent heat
- Industrial Boilers (Biomass/Coal) – Mid-temp flue gas
Not ideal for: Waste incineration (high HCl → use PTFE) or high-moisture acid gases (use PPS).
Nomex vs PPS vs PTFE vs Fiberglass: Which Filter Bag Wins?
| Material | Max Temp | Acid Resistance | Cost (USD/m²) | Best For |
|---|---|---|---|---|
| Nomex | 200°C | Good | 8–12 | Abrasion + mid-heat |
| PPS (Ryton) | 190°C | Excellent | 10–15 | Acid gases (coal boilers) |
| PTFE (Teflon) | 260°C | Supreme | 25–40 | Incineration, chemicals |
| Fiberglass | 280°C | Poor | 5–8 | Cement kiln head (pulse jet no!) |
Choose Nomex when: Temperature ≤200°C, high abrasion, dry gas, budget < PTFE.
Expected Lifespan & Maintenance Tips
- Average life: 3–5 years (vs polyester 1–2 years)
- Cleaning method: Pulse jet or reverse air (avoid shaker on plain felt)
- Failure signs: Holes near cage, pressure drop >1500 Pa, visible leaks
- Extend life: Use PTFE membrane + proper differential pressure control
Pricing & OEM Customization
- Standard 500 g/m² Nomex bag (Φ160×6000 mm): USD 45–65/pc (MOQ 100 pcs)
- PTFE membrane laminated: +30–40%
- Lead time: 2–3 weeks (stock), 4–6 weeks (custom)
- Free sample policy: 1 meter felt or 1 mini bag (freight collect)
Why Choose Our Nomex Filter Bags?
- ✅ 10+ years OEM supplier to EU/US plants
- ✅ ISO 9001 & SGS certified meta-aramid felt
- ✅ Custom cage fit: snap band, rope, gasket
- ✅ Global shipping: Russia, Turkey, India, Brazil
- ✅ Technical support: Baghouse audit + filter media selection
FAQs About Nomex Filter Bags
Can Nomex handle moisture?
No – avoid >10% moisture + >150°C. Use PPS or PTFE membrane for humid acid gases.
Is Nomex the same as Kevlar?
No. Both are aramids: Nomex = meta-aramid (heat/flame), Kevlar = para-aramid (strength).
What’s the difference between Nomex and generic aramid?
Nomex is DuPont’s brand. Generic meta-aramid is 90–95% similar but may vary in fiber consistency.
Ready to Upgrade Your Baghouse?
Request a free Nomex sample or custom quote today.
Tags: nomex filter bag, aramid dust collector, 200°C filter cloth, cement kiln baghouse, asphalt plant filtration, high temperature needle felt
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