Fiberglass Filter Bag
Fiberglass filter bags from LYH fit cement kilns, steel sintering, smelting, glass furnaces, carbon black, and the highest-temperature flue gas applications in heavy industry. Buyers choose Fiberglass filter bags when they need sustained service up to 260 °C, exceptional dimensional stability under thermal cycling, and a proven solution for furnace exhaust where synthetic fibers like Aramid and P84 reach their thermal limits.
We supply Fiberglass woven filter bags from China with custom size discussion, surface treatment options (PTFE / silicone / graphite finish, ePTFE membrane), and full construction support. If your project requires a specific bag diameter, length, top/bottom construction, or PTFE membrane match for ultra-low emission compliance, we can review the RFQ and pair the right Fiberglass fabric to your dust collector.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Material | E-glass / alkali-free woven fiberglass fabric, PTFE / silicone / graphite finished |
| Continuous Operating Temperature | 260 °C / 500 °F |
| Maximum Short-Term Surge Temperature | 290 °C / 554 °F |
| Specific Density | 2.54 g/cm³ |
| Moisture Regain (20 °C, 65% RH) | 0% |
| Standard Fabric Weight | 600 / 750 / 850 / 950 GSM (customizable) |
| Air Permeability | 8–14 m³/m²/min @ 200 Pa |
| Tensile Strength (Warp / Weft) | ≥ 2,000 N / 5×20 cm |
| Filtration Efficiency | ≥ 99.9% (with ePTFE membrane: ≥ 99.99%) |
| Combustibility | Non-flammable (LOI > 95) |
| Standard Construction | Woven (twill, satin, or plain weave) — needle felt available on request |
Material Properties
Highest Continuous Operating Temperature in the Standard Filter Media Family — Fiberglass woven fabric maintains full mechanical integrity at 260 °C continuous service with short-term peaks to 290 °C. This makes it the standard choice for cement kiln tail, steel sintering, glass furnace, and smelting applications where sustained temperatures exceed the limits of all synthetic fibers.
Outstanding Dimensional Stability — Glass fibers do not shrink, creep, or elongate under thermal load. After surface treatment, fiberglass fabric retains its dimensions across years of thermal cycling, ensuring consistent fit on the cage and stable filtration area throughout service life.
Inherently Non-Flammable — Fiberglass is mineral-based and does not burn under any operating condition (LOI > 95), providing inherent safety in furnace, smelting, and other ignition-risk applications.
Excellent Acid Resistance & Zero Moisture Regain — Fiberglass is fully resistant to acid dew point conditions, sulfur-rich flue gas, and saturated steam. Zero moisture absorption means performance is unaffected by humidity or condensation.
Cost-Effective High-Temperature Solution — Fiberglass delivers the lowest cost per square meter among all media capable of sustained 260 °C service — substantially less expensive than P84 or PTFE for equivalent thermal capability.
Limitations to Note — Fiberglass fibers are brittle and have low flex resistance; the bag must be handled carefully during installation, and pulse-cleaning frequency must be controlled to avoid premature fiber fatigue. Fiberglass is vulnerable to alkali attack at elevated temperatures and to fluorine-containing flue gas. For applications with high alkali content or HF, consider PTFE or specialized FMS composite alternatives.
Available Surface Treatments
Surface treatment is mandatory on all fiberglass filter bags — untreated fiberglass fabric does not survive abrasive service. The choice of finish determines chemical compatibility, abrasion resistance, and service life.
| Treatment | Function | Recommended For |
|---|---|---|
| PTFE / Silicone / Graphite Finish (3-Proof) | Standard finish: PTFE for chemical resistance, silicone for flex resistance, graphite for self-lubrication. Significantly improves abrasion and flex life. | Standard cement, steel sintering, smelting |
| PTFE Impregnation | Concentrated PTFE bath increases chemical resistance and lubricity over standard 3-proof. | Acid-rich flue gas, high-chemistry applications |
| ePTFE Membrane Lamination | Microporous expanded-PTFE membrane on dust side; emissions ≤ 5 mg/Nm³, surface filtration. | Ultra-low emission compliance, fine PM2.5 capture |
| Acid-Resistant Finish | Specialized chemical finish for sulfur-rich and acid dew point exhaust. | Coal-fired power, sulfur recovery |
| Silicone-Free PTFE Finish | PTFE-only finish without silicone, for specific food-contact or electronic applications. | Food, electronics, specialty applications |
Bag Construction
- Weave Pattern — Twill (standard), satin (smooth surface for cake release), plain (high-strength applications)
- Top Constructions — Snap band, flange top, ring top, soft cuff, raw edge, strap top
- Bottom Constructions — Disc bottom, flat bottom, reinforced double-bottom, wear-strip bottom
- Sewing — 3-needle chain stitch with PTFE thread (mandatory for high-temperature service); fiberglass thread for extreme temperatures; overlock or lockstitch on bottoms
- Reinforcement — Wear strips and double-bottom reinforcement strongly recommended due to fiberglass’s lower flex resistance
- Handling — Proper installation procedure required to prevent fiber damage; cage tolerance and finish quality are critical
Standard Sizes & Customization
| Dimension | Range |
|---|---|
| Diameter | Φ100 / 120 / 125 / 130 / 150 / 160 / 180 / 250 mm (or custom) |
| Length | 1,000 – 10,000 mm (longer lengths available — fiberglass tolerates load better than synthetic fibers) |
| Tolerance | Diameter ± 2 mm, Length ± 5 mm |
Non-standard sizes, special top/bottom configurations, and OEM patterns produced from your drawings or sample bag.
Industry Applications
- Cement Kilns — kiln tail and clinker cooler dedusting at 200–260 °C, the largest global application of fiberglass filter bags
- Steel Sintering — sinter plant main exhaust, blast furnace gas cleaning
- Glass Manufacturing — furnace exhaust dedusting at high temperature
- Carbon Black Production — process tail gas at sustained high temperature
- Non-Ferrous Smelting — copper, lead, zinc, aluminum smelting exhaust
- Iron & Steel Secondary Dedusting — EAF, ladle refining, hot-metal pretreatment
- Power Plants — coal-fired boilers, particularly economizer outlet zones
- Petrochemical & Refining — fluid catalytic cracking (FCC), process gas dedusting
- Lime & Gypsum Plants — kiln exhaust at elevated temperature
- Asphalt Mixing — high-end installations requiring extended service life and ultra-low emission compliance
Why Choose LYH Fiberglass Filter Bags
- Premium E-glass / alkali-free fiberglass fabric — sourced from leading global producers; woven and finished to industry-standard specifications
- Strict QC on fabric weight, air permeability, tensile strength, finish uniformity, ePTFE membrane integrity
- Full customization — any size, any weave pattern, any top/bottom, any treatment combination
- Engineered for cement & smelting duty — proven configurations for kiln tail, sinter plants, and high-temperature furnaces
- High-temperature sewing — all seams use PTFE or fiberglass thread for thermal compatibility
- Fast lead time — standard sizes ship in 15–25 days
- Engineering support — application engineers help match fabric, weave, and finish to your gas temperature, chemistry, and emission target
- Reliable logistics — individually wrapped, ring-up packing, sea / air / courier shipment worldwide
FAQ
Q1: What is the maximum operating temperature of Fiberglass filter bags? Fiberglass filter bags operate continuously at up to 260 °C (500 °F) with short-term peaks up to 290 °C. Fiberglass is the standard choice for cement kiln tail, steel sintering, glass furnaces, and smelting applications where sustained temperatures exceed the limits of synthetic fibers like Aramid (204 °C) or P84 (240 °C).
Q2: Why does fiberglass fabric require surface treatment? Untreated fiberglass fibers are brittle and have very low flex resistance — they cannot survive pulse-jet cleaning cycles without surface treatment. The standard PTFE/silicone/graphite “3-proof” finish dramatically improves abrasion and flex resistance, making fiberglass viable for industrial baghouse service. The choice of finish also determines chemical compatibility.
Q3: Why choose Fiberglass over P84 or PTFE? Fiberglass offers higher temperature tolerance (260 °C continuous) than P84 (240 °C) at significantly lower cost per square meter. PTFE has equivalent thermal capability and superior chemical resistance but at 3–5× the cost. Fiberglass is preferred when (1) high temperature is the primary requirement, (2) gas chemistry is moderate (no HF, low alkali), and (3) cost-effectiveness matters.
Q4: Is fiberglass woven or needle-felt? Fiberglass filter bags are predominantly woven — the dominant industrial format. Woven fiberglass offers superior dimensional stability, mechanical strength, and thermal resistance. Needle-felt fiberglass is available for specific surface filtration applications but is less common.
Q5: When should I specify ePTFE membrane on fiberglass bags? ePTFE membrane lamination is essential for ultra-low emission compliance (≤ 10 mg/Nm³, often ≤ 5 mg/Nm³). The membrane provides surface filtration with virtually zero particle penetration, captures fine PM2.5 particulates, and dramatically extends bag life by preventing dust embedment in the fabric. Fiberglass + ePTFE is the most cost-effective ultra-low emission solution.
Q6: What is the typical service life of fiberglass filter bags? In typical cement kiln tail and steel sintering applications, fiberglass filter bags deliver 3–5 years of service life. With ePTFE membrane lamination, service life can extend to 5–7 years due to surface filtration and reduced bag wear.
Q7: How should fiberglass filter bags be installed? Fiberglass requires careful handling during installation. The cage must be free of burrs, properly sized, and clean. Avoid sharp bending or twisting of the bag. Pulse-cleaning pressure should be controlled to extend flex life. Proper installation typically doubles the service life compared to careless handling.
Q8: What information do I need to provide for a quote? (1) bag dimensions, (2) top/bottom construction, (3) operating temperature & humidity, (4) gas chemistry (acid, alkali, fluorine, oxidizer), (5) dust type & concentration, (6) emission requirement, (7) quantity. A drawing or sample bag is even better.
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