Foundry Filter Bags
Industrial Dust Collection for Metal Casting & Smelting Operations
Engineered by ECOGRACE
Product Overview
ECOGRACE foundry filter bags are engineered for the extreme dust collection demands of metal casting facilities. Foundry operations — including melting, pouring, shakeout, and sand handling — generate heavy concentrations of metallic fume, silica dust, and chemical binders that require robust, high-efficiency filtration media to meet occupational health and environmental emission standards.
Our foundry filter bags deliver 99.9% filtration efficiency at 0.3 microns, withstanding continuous temperatures from 130°C to 260°C depending on material selection. Each bag is constructed with reinforced stitching and abrasion-resistant base cloth to handle the aggressive metallic particulates and thermal shock cycles inherent in foundry environments.
With proven installations in iron, steel, aluminum, copper, and zinc foundries worldwide, ECOGRACE provides customized dust collector filter bags that reduce particulate emissions below 10 mg/Nm³, extend service life to 24-36 months, and lower total filtration operating costs.
Filter Bags for Each Foundry Process
Melting & Smelting
Metallic fume at 180-260°C from induction furnaces, cupola furnaces, and electric arc furnaces. NOMEX filter bags or fiber glass filter bags with PTFE membrane for sub-micron fume capture.
Pouring & Casting
Dense metallic smoke and organic binder fumes at 150-220°C during mold filling. Requires chemical-resistant media with oleophobic treatment to prevent binder condensation and bag blinding.
Shakeout & Knockout
Extremely heavy dust loads of sand, metal fragments, and burned binder at 100-160°C. Abrasion-resistant polyester or aramid media with reinforced bottom construction essential.
Sand Reclamation
Silica dust at 80-120°C from thermal and mechanical sand reclamation systems. Polyester needle felt with anti-static treatment and fine-denier fiber construction for respirable silica capture.
Grinding & Finishing
Fine metallic dust and abrasive grinding particles at ambient to 80°C. Standard polyester filter bags with spark arrestor pre-filtration recommended for fire safety compliance.
Recommended Filter Media for Foundries
NOMEX (Aramid) Filter Bags
200-260°C continuous operation. Superior flex and abrasion resistance for furnace fume collection. Ideal for induction furnace and cupola exhaust systems.
Fiber Glass Filter Bags
Up to 280°C for electric arc furnace applications. Excellent dimensional stability under thermal cycling. PTFE membrane option for ultra-fine metallic fume.
PTFE Membrane Filter Bags
Surface filtration for sub-micron metallic fume. Achieves <5 mg/Nm³ outlet emissions. Prevents depth filtration and extends cleaning efficiency across the bag lifespan.
PPS Filter Bags
160-190°C with strong acid and alkali resistance. Suitable for foundries using chemical binders or processing non-ferrous metals with corrosive off-gases.
Material Comparison for Foundry Applications
| Material | Temperature | Best Foundry Application | Service Life |
|---|---|---|---|
| NOMEX (Aramid) | 200-260°C | Induction furnace, cupola exhaust | 24-36 months |
| Fiber Glass | Up to 280°C | Electric arc furnace | 18-24 months |
| PTFE Membrane | Up to 260°C | Fume collection, ultra-low emission | 24-36 months |
| PPS | 160-190°C | Non-ferrous smelting, chemical binder | 24-30 months |
| Polyester | Up to 130°C | Shakeout, sand handling, grinding | 18-24 months |
Technical Parameters
| Parameter | Specification |
|---|---|
| Filtration Efficiency | 99.9% at 0.3 microns |
| Outlet Emission | <10 mg/Nm³ (PTFE membrane <5 mg/Nm³) |
| Temperature Range | 130°C – 280°C (material dependent) |
| Dust Handling Capacity | Up to 800 g/m³ inlet concentration |
| Air-to-Cloth Ratio | 0.8-1.5 m/min (foundry fume applications) |
| Service Life | 18-36 months (application dependent) |
| Tensile Strength | ≥800N/5cm (warp) / ≥1000N/5cm (weft) |
| Air Permeability | 8-14 m³/m²/min @ 200Pa |
| Surface Treatment | Singeing, calendering, PTFE membrane, oleophobic coating optional |
| Certification | ISO 9001, ISO 14001, CE |
Why Foundries Need Specialized Filter Bags
Foundry dust collection presents unique challenges that standard industrial filter bags cannot handle. The combination of sub-micron metallic fume, extreme temperature swings during pour cycles, sticky organic binder residues, and heavy abrasive sand particles demands purpose-engineered filtration media.
Sub-Micron Metal Fume
Furnace fumes contain particles as small as 0.01 microns — iron oxide, zinc oxide, and lead compounds that penetrate standard filter media. PTFE membrane surface filtration is critical for fume capture.
Thermal Shock Cycling
Batch pouring operations create rapid temperature fluctuations of 100°C+ within minutes. Filter media must maintain dimensional stability and fiber integrity through thousands of thermal cycles.
Binder Condensation
Organic binders (phenolic resins, furan, isocyanate) produce sticky condensable vapors that coat filter surfaces. Oleophobic and hydrophobic treatments prevent pore clogging and bag blinding.
Spark & Fire Risk
Hot metal particles and sparks from grinding operations can ignite accumulated dust on filter surfaces. Flame-retardant media and proper spark arrestor systems are mandatory for safety compliance.
Foundry Types We Serve
ECOGRACE Advantages for Foundry Operations
Furnace-Specific Engineering
Filter bags customized to your specific furnace type — induction, cupola, electric arc, or reverberatory. We analyze your metal type, melt temperature, and off-gas composition for optimal material selection.
Fume Capture Expertise
PTFE membrane laminated filter bags capture metallic fume particles as small as 0.1 microns. Proven to reduce workplace exposure to iron oxide, zinc oxide, and lead fumes below OSHA PEL limits.
Reduced Downtime
Reinforced construction and advanced surface treatments extend bag replacement intervals to 24-36 months, minimizing production interruptions and lowering your maintenance labor costs by up to 35%.
Regulatory Compliance
Meet EPA MACT standards for iron and steel foundries, EU BAT-AELs, and local emission limits. Our filter solutions help foundries achieve and maintain environmental permits without costly system upgrades.
Frequently Asked Questions
What filter bag material is best for foundry fume collection?
For melting and smelting fume above 200°C, NOMEX filter bags with PTFE membrane provide the best balance of heat resistance and sub-micron fume capture. For electric arc furnace applications above 250°C, fiber glass filter bags are recommended.
How do you handle organic binder condensation issues?
We apply oleophobic and hydrophobic treatments to filter media surfaces, preventing sticky binder residues from penetrating fiber structures. Combined with PTFE membrane lamination, this keeps pressure drop stable and avoids premature bag blinding common in no-bake and cold-box foundries.
Can you supply replacement bags for existing foundry baghouse systems?
Yes. We manufacture replacement filter bags compatible with all major industrial dust collector brands and baghouse designs used in foundries. Provide your current bag dimensions and we deliver exact-fit replacements.
What about silica dust compliance for foundry shakeout?
Our fine-denier polyester and PTFE membrane filter bags are specifically designed to capture respirable crystalline silica particles below 4 microns, helping foundries comply with OSHA’s 50 μg/m³ PEL for silica exposure.
What is the minimum order quantity and delivery time?
MOQ is 100 pieces for standard sizes. Standard delivery within 15-20 days. Custom dimensions within 20-25 days. Emergency orders available for critical baghouse replacement needs. Free samples provided for evaluation.
Request a Technical Quote for Foundry Filter Bags
Contact ECOGRACE for customized dust collection solutions for your foundry operations
[email protected]WhatsApp: +86-13588065995
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