PPS + PTFE Composite Needle Punched Felt Filter Bag
PPS + PTFE composite needle punched felt filter bags from LYH fit coal-fired power plants, waste-to-energy plants, biomass boilers, and any high-temperature flue gas application requiring both acid resistance and protection against oxidizing agents. Buyers choose PPS + PTFE composite filter bags when they need the proven economics of PPS combined with the chemical immunity of PTFE — extending service life by 2–3× in flue gas with elevated O₂, NOx, or trace halogen content.
We supply PPS + PTFE composite filter bags from China with custom size discussion, fabric weight options (500–650 GSM), and full surface treatment support including ePTFE membrane lamination for ultra-low emission compliance. If your project requires a specific bag diameter, length, top/bottom construction, or composite formulation match for your power plant or incineration baghouse, we can review the RFQ and pair the right composite to your dust collector.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Material | PPS + PTFE blended needle felt (typical 80/20 or 70/30 ratio, customizable) |
| Scrim | PPS or PTFE multifilament scrim |
| Continuous Operating Temperature (Dry) | 190–210 °C / 374–410 °F |
| Continuous Operating Temperature (Moist) | 190–210 °C / 374–410 °F |
| Maximum Short-Term Surge Temperature | 210–240 °C / 410–464 °F |
| Specific Density | ≈ 1.4–1.6 g/cm³ |
| Moisture Regain (20 °C, 65% RH) | 0.3–0.6% |
| Standard Fabric Weight | 500 / 550 / 600 / 650 GSM (customizable) |
| Air Permeability | 10–16 m³/m²/min @ 200 Pa |
| Tensile Strength (Warp / Weft) | ≥ 1,100 N / 5×20 cm |
| Filtration Efficiency | ≥ 99.9% (with ePTFE membrane: ≥ 99.99%) |
| Combustibility | Self-extinguishing / Non-flammable |
Material Properties
Dual-Fiber Synergy — PPS + PTFE composite blends the two highest-performing fibers in industrial filtration into a single needle felt. PPS provides cost-effective acid resistance and dimensional stability; PTFE adds chemical immunity to oxidation, halogens, and aggressive flue gas components that PPS alone cannot withstand. The resulting composite outperforms either fiber alone in real-world coal-fired and waste-to-energy applications.
Significantly Extended Service Life vs. Pure PPS — In flue gas with elevated O₂ (>10%), high NOx, or trace bromine — conditions where pure PPS oxidizes prematurely — PPS + PTFE composite typically delivers 2–3× longer service life. For coal-fired power plants and biomass boilers, this translates from 4–6 years (pure PPS) to 6–8+ years (composite).
Outstanding Acid, Alkali & Hydrolysis Resistance — Inherited from both base fibers; PPS + PTFE composite withstands SOx/SO₃, HCl, acid dew point conditions, saturated steam, and the full pH range. This combined chemical resistance makes it the premium standard for the most demanding flue gas applications.
Stable High-Temperature Performance — Continuous service up to 190–210 °C, with the PTFE component providing additional thermal headroom and oxidation protection at the upper end of PPS’s operating range. Self-extinguishing combustibility behavior (LOI ≥ 34) provides inherent safety.
Excellent Dust Cake Release & Lower Pressure Drop — PTFE fiber’s intrinsically low surface energy reduces dust adhesion across the entire felt thickness — not just at the surface as with PTFE membrane alone. Result: lower differential pressure, cleaner pulse-jet release, and reduced compressed air consumption over the bag’s service life.
Cost-Effective Premium Solution — While more expensive than pure PPS, the composite is significantly less expensive than 100% PTFE filter bags. For coal-fired and waste-to-energy applications with oxidation concerns, PPS + PTFE composite offers the best total lifecycle cost in the industry.
Limitations to Note — Continuous operating temperature is bounded by the PPS component (~190–210 °C) and does not reach pure PTFE’s 260 °C limit. For applications above 210 °C or with extreme chemical aggression (HF, fluorine, aqua regia), pure PTFE remains the correct choice.
Available Surface Treatments
| Treatment | Function | Recommended For |
|---|---|---|
| Singeing | Removes loose surface fibers via flame; improves cake release | Standard high-temp acidic dust |
| Calendering / Glazing | Heated rollers densify the surface; enhances surface filtration | Fine-particle capture, low pressure drop |
| Heat Setting | Stabilizes felt dimensions, eliminates shrinkage during operation | All applications |
| ePTFE Membrane Lamination | Microporous expanded-PTFE membrane on dust side; emissions ≤ 5 mg/Nm³ | Ultra-low emission compliance, oxidizing flue gas protection |
| Anti-Static | Conductive carbon fiber or stainless-steel filament; surface resistance 10³–10⁸ Ω·cm | Combustible coal dust, biomass, waste-to-energy |
| Water & Oil Repellent (WO) | Enhanced moisture and oil rejection finish | Wet flue gas, condensate-prone zones |
Bag Construction
- 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 composite); overlock or lockstitch on bottoms
- Reinforcement — Optional wear strips, custom skirts, double-bottom reinforcement for abrasive coal ash and biomass dust
Standard Sizes & Customization
| Dimension | Range |
|---|---|
| Diameter | Φ100 / 120 / 125 / 130 / 150 / 160 / 180 / 250 mm (or custom) |
| Length | 1,000 – 8,000 mm (custom lengths available) |
| 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
- Coal-Fired Power Plants — flue gas dedusting with elevated O₂, NOx, or oxidation concerns — the largest global application of PPS + PTFE composite filter bags
- Waste-to-Energy Plants — municipal solid waste (MSW), refuse-derived fuel (RDF), exhaust with halogen and acid components
- Biomass Power Generation — wood, agricultural residue, bagasse combustion with stringent emission targets
- Hazardous Waste Incineration — moderate-aggression streams not requiring full PTFE
- Steel Sintering — sinter plants with elevated SOx and NOx loading
- Cement Kilns — alternative fuel co-processing with chlorine and sulfur
- Industrial Boilers — coal, oil, and biomass-fired industrial steam boilers
- Glass Manufacturing — secondary furnace exhaust with corrosive components
- Lime & Gypsum Plants — kiln exhaust at acid dew point with extended service life requirements
- Ultra-Low Emission Compliance — high-temperature applications mandating ≤ 10 mg/Nm³ or ≤ 5 mg/Nm³ in oxidizing flue gas
Why Choose LYH PPS + PTFE Composite Filter Bags
- Premium PPS and PTFE fiber — sourced from leading global producers; uniform blending ensures consistent composite performance
- Customizable blend ratio — standard 80/20 or 70/30 PPS/PTFE blends available; custom ratios on request
- Strict QC on fabric weight, air permeability, tensile strength, blend uniformity, oxidation resistance
- Full customization — any size, any top/bottom, any treatment combination
- Engineered for extended service — proven configurations for coal-fired, waste-to-energy, and biomass applications
- PTFE thread sewing — all seams use PTFE thread for full chemical compatibility
- Fast lead time — standard sizes ship in 15–25 days
- Engineering support — application engineers help select blend ratio, treatment, and construction based on your O₂, NOx, and SOx levels
- Reliable logistics — individually wrapped, ring-up packing, sea / air / courier shipment worldwide
FAQ
Q1: What is the maximum operating temperature of PPS + PTFE composite filter bags? PPS + PTFE composite filter bags operate continuously at up to 190–210 °C in both dry and moist conditions, with short-term peaks up to 210–240 °C. The exact range depends on the PPS/PTFE blend ratio. For sustained operation above 210 °C, choose pure PTFE filter bags (260 °C) or P84 (240 °C dry).
Q2: Why choose PPS + PTFE composite over pure PPS? Pure PPS is vulnerable to oxidation in flue gas with elevated O₂ (>10%), high NOx, or trace halogens — conditions common in modern coal-fired power and waste-to-energy plants. PPS + PTFE composite adds PTFE fiber throughout the felt, providing oxidation immunity and extending service life by 2–3× in these applications. The premium pays back through reduced replacement frequency and downtime.
Q3: How does PPS + PTFE composite differ from a PTFE membrane on PPS? A PTFE membrane is a thin (~10 μm) microporous layer laminated to the surface of a PPS felt; it provides ultra-low emission compliance and surface filtration but offers limited protection if the membrane wears or is damaged. PPS + PTFE composite integrates PTFE fibers throughout the felt’s full thickness, providing oxidation protection at every level. The two technologies are complementary — premium installations often use PPS + PTFE composite + ePTFE membrane for the best of both.
Q4: When should I choose pure PTFE instead of PPS + PTFE composite? Choose pure PTFE when (1) operating temperature exceeds 210 °C, (2) flue gas contains HF, fluorine, or extreme acid/alkali concentrations, (3) service life requirement exceeds 8 years, or (4) emission targets are below 5 mg/Nm³ in highly oxidizing environments. For most coal-fired and waste-to-energy applications, PPS + PTFE composite offers better total lifecycle cost than pure PTFE.
Q5: What is the typical PPS/PTFE blend ratio? The most common blend ratios are 80/20 (PPS/PTFE) for moderate oxidation protection and 70/30 for higher oxidation resistance. Custom ratios from 90/10 to 50/50 are available depending on flue gas chemistry. Higher PTFE content increases oxidation resistance and cost; lower PTFE content maintains PPS economics with moderate enhancement.
Q6: What is the typical service life of PPS + PTFE composite filter bags? In typical coal-fired power plant applications with elevated O₂ or NOx, PPS + PTFE composite filter bags deliver 6–8+ years of service life — substantially longer than pure PPS (4–6 years) and approaching pure PTFE (5–8 years) at significantly lower cost.
Q7: Can PPS + PTFE composite filter bags be made anti-static? Yes. Anti-static composite with conductive carbon fiber or stainless-steel filament is available for biomass, MSW incineration, and other combustible-dust applications. Surface resistance is controlled to 10³–10⁸ Ω·cm.
Q8: What information do I need to provide for a quote? (1) bag dimensions, (2) top/bottom construction, (3) operating temperature & humidity, (4) flue gas composition (SOx, NOx, O₂, HCl, halogens), (5) dust type & concentration, (6) emission requirement, (7) preferred PPS/PTFE blend ratio if known, (8) quantity. A drawing or sample bag is even better.
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