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| Used for dust collection in the kiln heads of asphalt mixing plants, non-ferrous metal smelting plants, ceramics, glass, cement industries, as well as in blast furnace gas of steel mills. | |||||||||
Introduction
Also known as Nomex Filter Bags (a registered trademark of DuPont for meta-aramid fibers) and High-Temperature Meta-Aramid Filtration Bags, this industrial filtration solution is engineered to address the critical gap in extreme heat environments where polyester, acrylic, or even standard PPS filters degrade rapidly. Constructed from high-performance meta-aramid fibers (specifically aramid 1313, a material certified by ISO 13934-1 for textile strength), these filter bags deliver a rare combination of exceptional thermal stability, flame resistance, and reliable dust capture capabilities—making them a staple in industries where sustained high temperatures are non-negotiable.
Designed to operate continuously at 190.56°C (375°F) with short-term surge tolerance up to 218.33°C (425°F) (critical for processes like metal smelting where temperature spikes from molten material contact are common), these aramid filter bags outperform polyester (max 135°C) and acrylic (max 140°C) alternatives by a significant margin in sustained high-heat applications. Their unique molecular structure—characterized by aromatic rings linked by amide bonds—provides inherent flame resistance (no additional chemical treatments needed) and thermal insulation, ensuring consistent performance even in environments where temperature fluctuations of ±30°C occur daily.
Application scenarios
Temperature Resistance: Maintains structural integrity at continuous operating temperatures up to 190.56°C, with short-term exposure capability up to 218.33°C without fiber shrinkage or brittleness—tested per ASTM D5432 standards for high-temperature textile performance.
Filtration Efficiency: Achieves M14 filtration rating (per EN ISO 16890), capturing 99.9% of particles as small as 10 microns—ideal for fine dust control in high-temperature processes like glass furnace exhaust, where respirable silica dust poses health risks.
Flame Resistance: Inherently flame-retardant material meets UL 94 V-0 standards (self-extinguishes within 10 seconds of flame removal) and NFPA 2112 for thermal hazard protection, preventing fire propagation in combustible dust environments (e.g., coal-fired boiler dust).
Mechanical Strength: Tensile strength of 1700N/5cm in warp direction and 1500N/5cm in weft direction (tested via ASTM D5034), resisting tearing during installation, pulse-jet cleaning cycles (up to 6 bar pressure), and high-velocity dust impacts (up to 15 m/s).
Maximum Continuous Temperature: 190.56°C (375°F)
Oxidation Resistance: Maintains ≥85% of original tensile strength after 2000+ hours in air at 200°C (per ISO 4892-3 accelerated aging tests), outperforming glass fiber bags which lose 30% strength in the same period.
Moisture Tolerance: Operates effectively in environments with 30–70% relative humidity, with no hydrolysis (fiber breakdown) observed even after 12 months of continuous use in humid metal smelting facilities.
Seam Construction: Heat-sealed with aramid threads (100% aramid 1313, 20/3 tex count) to prevent thermal degradation at seam points—critical, as seams are the most common failure point in high-temperature filter bags.
Product Advantages
Compared to other high-temperature filtration materials (glass fiber, PTFE, PPS), these aramid filter bags offer distinct, cost-driven benefits:
Cost-Effectiveness: 40% more affordable than PTFE filters (average cost of 150 vs. 250 per bag) while providing superior thermal performance to polyester (190°C vs. 135°C max temp).
Thermal Shock Resistance: Withstands 500+ thermal cycles between 20°C (ambient) and 190°C without structural failure—critical for batch processes like batch-type incinerators, where cooling/heating cycles occur daily.
Energy Efficiency: Lower air resistance (initial pressure drop of 0.4 bar vs. 0.6 bar for glass fiber) reduces fan energy consumption by 15–20%. A glass plant in Pennsylvania reported $12,000 in annual energy savings for a 10,000 CFM baghouse.
Easy Handling: More flexible (bend radius of 50mm vs. 100mm for glass fiber) than rigid glass fiber alternatives, simplifying installation and reducing breakage during maintenance—field data shows a 75% reduction in bag damage during changeouts.
