High-Temperature, Fire-Retardant Meta-Aramid Dust Collector Media
The Nomex Filter Bag (NMX Series) is a high-performance industrial filtration media manufactured from 100% meta-aramid (Nomex) needle felt. Positioned between standard polyester bags and extreme-temperature volcanic or composite bags, Nomex provides excellent heat resistance, operating continuously at 204°C (400°F) with transient surge capabilities up to 240°C. Its defining characteristic is its self-extinguishing fire retardancy, making it the premier choice for asphalt mixing plants, foundries, and cement kilns where high-velocity aggregate dust and hot-mix exhaust are constant.
Core System Advantages
Self-Extinguishing Fire Safety: Unlike standard polyester, 100% meta-aramid fibers possess a Limiting Oxygen Index (LOI) of 30. They will not sustain a flame, meaning they simply carbonize at 400°C rather than melting or fueling a baghouse fire.
Flex-Fatigue Durability: Designed to endure continuous pulse-jet cleaning cycles without micro-fracturing. The media maintains a tensile strength of over 1000 N (weft) even under continuous thermal cycling.
Featured Model Configurations
NMX-707 | Asphalt Mixing Bag
Airflow Capacity: 6,000 m³/h | Dust Load: ≤ 120 g/m³ | Temp Rating: 220°C
Engineered for the high abrasive wear and 150°C–180°C hot-mix exhaust generated by asphalt concrete mixing.
NMX-1000 | Heavy-Duty Foundry Exhaust
Airflow Capacity: 12,000 m³/h | Dust Load: ≤ 180 g/m³ | Temp Rating: 240°C
High-capacity bags built for the extreme dust loads and thermal surges of ironworks, blast furnaces, and smelting.
Reasons behind choosing Nomex Filter Bag
Cost-Effective Thermal Sweet Spot: Bridges the gap between low-temp polyester (110°C limit) and extreme-temp FMS/Basalt (260–300°C+), giving you reliable mid-to-high heat performance at a lower price point.
Self-Extinguishing Fire Retardancy: Made from 100% meta-aramid fibers with a Limiting Oxygen Index (LOI) of 30, stopping flame propagation and preventing bag ignition from minor hot embers.
High Flex & Abrasion Resistance: Resists mechanical wear from high-velocity coarse dust (such as aggregate in asphalt plants) and withstands continuous pulse-jet cleaning cycles without tearing.
Low Differential Pressure: Surface-concentrated filtration traps over 99.5% of particulate (up to 99.9% with a PTFE membrane), preventing deep pore blinding and lowering fan energy consumption.
Extended 3 to 5 Year Service Life: Provides years of stable operation under proper dry-gas conditions across asphalt mixing, foundries, cement kilns, and industrial coal boilers.
Why Leading Plants Choose SENOTAY Nomex Filter Bag
Factory-Direct Pricing. Certified Quality. Dedicated Support.
Best Price Guarantee
Certified & Compliant
Fast, Reliable Delivery
Comprehensive After-Sales Support
Lifetime Technical Support: Expert advice on system sizing, air-to-cloth ratios, and gas chemistry evaluation (such as monitoring moisture and acid levels to maximize bag life).
Full System/Parts Availability: Seamless access to matching internal hardware, including heavy-duty carbon steel or stainless steel filter cages.
Remote Troubleshooting: Swift diagnostics for field issues like premature blinding, sudden pressure drops, or localized abrasive wear.
Trusted by industrial environmental equipment and air filtration plants worldwide. Ready for yours.
Maintenance & Service Life
Maintenance Tips:
Regular cleaning extends service life by up to 30%
Avoid moisture during shutdowns
Use pulse-jet cleaning for optimal dust removal
Service Life: 3–5 years depending on application and cleaning frequency.
Key Properties of Nomex Filter Bags
| Property | Specification |
|---|
| Material | 100% Nomex (Meta-Aramid Needle Felt) |
| Continuous Temp | 204°C |
| Peak Temp | 240°C |
| Fire Retardancy | Self-extinguishing (LOI 30) |
| Chemical Resistance | Excellent against acids, alkalis & hydrolysis |
| Surface Treatment | PTFE coating for improved dust release |
| Air Permeability | 40–60 L/m²/s @ 200 Pa |
Comprehensive Technical Specifications of Nomex filter bag
product name: | Nomex filter bags |
Fiber Type | Meta-aromatic polyamide |
Weight (g/ Square meter ) | 500±10 |
Thickness(mm) | 1.8-2 |
Tensile strength (N/5×20cm) | vertical | >800 |
Weft | >1000 |
Air permeability (L/m2/s·200pa) | 40-60 |
Recommended operating temperature (℃) | <204 |
Instantaneous operating temperature (℃) | 240 |
Surface treatment process | PTFE coating |
Nomex Filter Bag Technical Specifications
| Model Code | Air Flow (m³/h) | Dust Load g/m³ | Filter Efficiency (%) | Application Temp (°C) |
|---|
| NMX-101 | 1800 | ≤50 | 98.5 | 200 |
| NMX-202 | 2500 | ≤60 | 99.0 | 210 |
| NMX-303 | 3000 | ≤70 | 99.2 | 220 |
| NMX-404 | 3500 | ≤80 | 99.3 | 230 |
| NMX-505 | 4200 | ≤90 | 99.4 | 240 |
| NMX-606 | 5000 | ≤100 | 99.5 | 204 |
| NMX-707 | 6000 | ≤120 | 99.6 | 220 |
| NMX-808 | 7500 | ≤130 | 99.7 | 230 |
| NMX-909 | 9000 | ≤150 | 99.8 | 240 |
| NMX-1000 | 12000 | ≤180 | 99.9 | 240 |
| Parameter | Standard Value | Test Method | Application Range | Notes |
|---|
| Fiber Content | 100% NOMEX® | Visual inspection | 70–100% NOMEX | May include composite materials |
| Weight | 500 ± 25 g/m² | ISO 9073-1 | 450–600 g/m² | Heavier for abrasive dust |
| Thickness | 1.8–2.2 mm | ISO 9073-2 | 1.5–2.5 mm | Measured @ 200 Pa |
| Meridional Tensile | > 2800 N/5×20 cm | ISO 9073-3 | 2500–3200 N | Room temperature |
| Latitudinal Tensile | > 2200 N/5×20 cm | ISO 9073-3 | 2000–2600 N | Room temperature |
| Air Permeability | 80–150 L/m²/s | ISO 9237 | 60–180 L/m²/s | At 200 Pa pressure |
| Continuous Temp | ≤ 220°C | ASTM D5587 | 180–220°C | Depends on composite |
| Peak Temp | 240°C | ASTM D5587 | 230–240°C | Short-term exposure |
| Filtration Efficiency | > 99.5% | EN 1822 | @ 1 μm particles | Varies with surface treatment |
| Hydrolysis Resistance | Excellent | Internal Test | Moderate to High | Superior to other aramids |
Features of Nomex Filter Bag
Material: Nomex filter bag is made of Nomex fibre needle felt, which has good spinnability and abrasion resistance.
High temperature resistance: Nomex filter bag has excellent high temperature resistance, can work continuously at 180℃ and the instantaneous working temperature can reach 220℃. This makes it highly stable and reliable in high temperature environment.
Fire retardant performance: Nomex fibres start to decompose and carbonize only at 400℃, with a limiting oxygen index (LOI) of 30, which is neither spontaneous nor combustion-inducing, and has good fire retardant properties.
Chemical corrosion resistance: Nomex filter bag has good chemical corrosion resistance, acid and alkali resistance is not easy to corrode, suitable for a variety of corrosive environments.
Filtration performance: Nomex filter bag has smooth surface, the entanglement between the fibres is enhanced, which can cope with higher filtration wind speed, forming a high surface area coefficient, increasing the chance of dust capture. At the same time, its special cross-section pattern makes most of the dust is concentrated on the surface of the filter media, it is more difficult to penetrate into the filter media internal blockage of the gap, reducing the operating resistance and thus improve the filtration wind speed.
Application areas: Nomex filter bags are widely used in smelters, carbon black plant, ironworks blast furnace gas, calcium carbide plant kiln exhaust, foundry, steel plant flue gas, cement plant kiln exhaust, asphalt concrete mixing asphalt flue gas, coal-fired boilers, and other high-temperature environment of the dust removal purification.
In short, Nomex filter bag is a kind of dust filter bag with excellent performance, suitable for high temperature, corrosive environment of industrial dust removal equipment. Its good high temperature resistance, fire retardant properties and chemical corrosion resistance make it in the field of industrial dust removal has a high market share.
Technical Strength of Senotay Nomex Dust Collector Bags
At our ISO 9001:2015-certified factory in Hebei, China, Senotay produces precision-engineered Nomex filter bags for reliable, high-temperature filtration.
Core Manufacturing Advantages
Controlled fiber density & uniform pore distribution
Advanced heat-setting to prevent shrinkage or deformation
Optional PTFE membrane for higher filtration efficiency
Custom designs for pulse-jet, reverse-air, or shaker systems
Industries Using Nomex Filter Bags
Steel and Iron Works
Cement & Building Materials
Chemical & Petrochemical Plants
Carbon Black & Asphalt Plants
Coal Power Stations
Waste Incineration Plants
These industries rely on Nomex dust collectors in China for consistent filtration and emission compliance under extreme conditions.
▪ Dust Filter Bag
▪ Polyester Filter Bag | FMS Filter Bag | Basalt Filter Bag | Nomex Filter Bag |
PTFE Filter Bag | Acrylic Filter Bag | Fiberglass Filter Bag | P84 Filter Bag | PPS Filter Bag
▪ Dust Collector Bag Cage
▪ Dust Collector Bag Cage | Galvanized Bag Cage | Silicone Bag Cage | Trapezoidal Bag Cage | Envelope Bag Cage | Cage Venturi Tube
▪ Dust filter element
▪ Air Filter Element | Top-mounted Dust Filter Element | Oblique-insert Dust Filter Element |
Lifting Dust Filter Element | Six-Ear Quick-release Dust Filter Element | Threaded Dust Filter Element | Flange Dust Filter Element
▪ Electromagnetic pulse valve
▪ DMF-Z Right Angle Solenoid Pulse Valve | DMF-Y Submerged Electromagnetic Pulse Valve
▪ Industrial Electric Precipitation Accessories
▪ Cathode Wire | Dust Collecting Plate | Vibrating Hammer | Bearing In Dust | Electrostatic Precipitator Porcelain Sleeve
Nomex Filter Bags: Quick FAQ
Q1: What is the maximum operating temperature?
Nomex (meta-aramid) filter bags handle a continuous operating threshold of up to 204°C (400°F), with short-term dry-heat surge limits reaching 240°C (464°F).
Q2: Why are they preferred for asphalt mixing plants?
They withstand hot-mix exhaust temperatures (150°C–180°C), resist high-velocity aggregate dust abrasion, and tolerate minor sulfur dioxide emissions from burner fuel.
Q3: How do they handle moisture and acids (Hydrolysis)?
Nomex is prone to hydrolytic breakdown under combined heat and moisture. It operates safely within a narrow chemical window of pH 4 to pH 10, requiring low moisture and tight dew-point monitoring.
Q4: Which surface treatments optimize performance?
Singed/Calendered: Removes surface fuzz to enhance cake release.
Water & Oil Repellent: Fluorocarbon finish prevents blinding from moisture/oil.
PTFE Membrane: Laminated layer captures PM2.5 while minimizing differential pressure.
Q5: What are the standard manufacturing tolerances?
To prevent dust bypass, precise industrial builds maintain tight physical tolerances of ±0.5mm on the cell plate diameter and ±10mm on overall bag length.
Q6: What is the ideal cloth weight for dust collection?
The industry standard is 500 g/m² needle felt. It balances optimal air permeability with a high tensile strength of over 1100 N/5cm for pulse-jet cleaning.
Q7: What causes premature bag failure?
Acid Hydrolysis: Acidic moisture breaks down aramid chains.
Spark Burn-Through: Unburned fuel or sparks cause physical holes.
Mechanical Abrasion: Over-cleaning against damaged or poorly fitted support cages.
Q8: What specifications are needed to request pricing?
Provide your supplier with the cell plate diameter, overall length, top/bottom connection styles (e.g., steel snap-band/reinforced disk), and your specific flue gas chemistry.
