PPS (Polyphenylene Sulfide) Needle Punched Felt Filter Bag
PPS needle punched felt filter bags from LYH fit coal-fired power plants, waste incineration, cement kilns, steel sintering, and industrial boilers handling acidic flue gas. Buyers choose PPS filter bags when they need stable performance under continuous high temperature up to 190 °C, exceptional acid and alkali resistance, and reliable hydrolysis resistance in saturated SOx-rich flue gas.
We supply PPS / Polyphenylene Sulfide filter bags from China with custom size discussion, fabric weight options (500–650 GSM), and full surface treatment 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 PPS felt to your dust collector.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Material | 100% PPS (Polyphenylene Sulfide) staple fiber, scrim-supported needle felt |
| Continuous Operating Temperature (Dry) | 160–190 °C / 320–374 °F |
| Continuous Operating Temperature (Moist) | 160 °C / 320 °F |
| Maximum Short-Term Surge Temperature | 190–200 °C / 374–392 °F |
| Specific Density | 1.38 g/cm³ |
| Moisture Regain (20 °C, 65% RH) | 0.6% |
| Standard Fabric Weight | 500 / 550 / 600 / 650 GSM (customizable) |
| Air Permeability | 12–18 m³/m²/min @ 200 Pa |
| Tensile Strength (Warp / Weft) | ≥ 1,100 N / 5×20 cm |
| Filtration Efficiency | ≥ 99.9% (with PTFE membrane: ≥ 99.99%) |
| Combustibility | Self-extinguishing (LOI ≥ 34) |
Material Properties
Exceptional Acid & Alkali Resistance — PPS fiber maintains its mechanical integrity across the full pH range, withstanding sulfuric acid, hydrochloric acid, and caustic alkali in concentrations and temperatures that would destroy polyester or acrylic. This makes PPS the industry standard for sulfur-rich coal flue gas and acid-laden waste incineration streams.
Outstanding Hydrolysis Resistance — Near-total resistance to hydrolytic degradation in saturated steam and acid dew point conditions. Unlike polyester or acrylic, PPS maintains tensile strength even under combined high temperature, humidity, and acidity over thousands of operating hours.
Stable High-Temperature Performance — Continuous service up to 190 °C dry / 160 °C moist, with short-term peaks to 200 °C. Self-extinguishing behavior (LOI ≥ 34) makes it inherently safer than polyester or acrylic in high-temperature systems.
Excellent Mechanical & Dimensional Stability — Heat-set during manufacturing; PPS felt resists shrinkage and deformation throughout its service life, ensuring consistent fit on the cage and stable filtration area.
Long Service Life in Harsh Conditions — In typical coal-fired power plant applications, PPS filter bags routinely deliver 4–6 years of service life — substantially longer than polyester or acrylic in equivalent conditions.
Limitations to Note — PPS is vulnerable to strong oxidizing agents (high O₂, NOx, Br₂). In gas streams with elevated free oxygen (>10%) or high NOx content, the recommended operating temperature must be reduced. For these applications, a PTFE membrane finish or PPS+PTFE composite is strongly recommended to extend service life.
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 |
| PTFE Membrane Lamination | Microporous ePTFE membrane on dust side; emissions ≤ 5 mg/Nm³ | Ultra-low emission compliance, oxidizing gas protection |
| PTFE Impregnation / Dipping | PTFE bath finish on each fiber; oxidation protection without membrane cost | High-O₂ / high-NOx flue gas |
| 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 (standard for high-temperature PPS); overlock or lockstitch on bottoms
- Reinforcement — Optional wear strips, custom skirts, double-bottom reinforcement for abrasive coal ash and sintering 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 — boiler flue gas dedusting, the largest global application of PPS filter bags
- Waste Incineration — municipal solid waste (MSW), medical waste, hazardous waste exhaust
- Biomass Power Generation — wood, bagasse, agricultural residue combustion
- Cement Kiln Tail — main exhaust dedusting at acid dew point conditions
- Steel Sintering — sinter plant main exhaust, dust laden with SOx
- Industrial Boilers — coal, oil, and biomass-fired industrial steam boilers
- Lime & Gypsum Plants — kiln exhaust at elevated temperature with acid components
- Glass Manufacturing — furnace exhaust dedusting
- Asphalt Mixing — high-temperature drum dryer exhaust (premium grade)
- Carbon Black & Petrochemical — process gas dedusting
Why Choose LYH PPS Filter Bags
- Premium PPS fiber — sourced from leading global producers; scrim-supported felt for stability and long-term resistance
- Strict QC on fabric weight, air permeability, tensile strength, hydrolysis stability, acid resistance
- Full customization — any size, any top/bottom, any treatment combination
- Engineered for power plant duty — proven configurations for coal-fired, biomass, and waste-to-energy applications
- Fast lead time — standard sizes ship in 10–20 days
- Engineering support — application engineers help match media to your flue gas chemistry, O₂ content, NOx level, and emission target
- Reliable logistics — individually wrapped, ring-up packing, sea / air / courier shipment worldwide
FAQ
Q1: What is the maximum operating temperature of PPS filter bags? PPS filter bags operate continuously at up to 190 °C (374 °F) dry / 160 °C moist, with short-term peaks up to 200 °C. For sustained operation above 190 °C, consider P84, aramid (Nomex), or fiberglass alternatives.
Q2: Why are PPS filter bags the standard choice for coal-fired power plants? PPS is uniquely suited to coal flue gas because it combines (1) sustained service above 160 °C — the typical baghouse operating temperature, (2) outstanding resistance to SO₂/SO₃ and acid dew point conditions, (3) excellent hydrolysis resistance for saturated flue gas, and (4) long service life of 4–6 years. No other mid-cost media offers this combination.
Q3: What is the impact of oxygen and NOx on PPS service life? PPS is sensitive to strong oxidizing agents. In flue gas with elevated free oxygen (>10%), high NOx, or trace bromine, PPS oxidation accelerates and recommended operating temperature must be reduced. For these conditions, specify PTFE membrane lamination or a PPS + PTFE composite to dramatically extend service life.
Q4: How does PPS compare to P84? PPS offers wider chemical resistance (especially in alkali) and lower cost, while P84 offers higher temperature tolerance (240 °C) and better fine-particle capture due to its multi-lobal fiber cross-section. PPS is preferred for coal-fired and waste incineration; P84 is preferred for high-temperature chemical and asphalt processes. Many premium installations use PPS+PTFE composite or PPS scrim with P84 batt to combine the strengths of both.
Q5: Should I always specify PTFE membrane on PPS bags? PTFE membrane lamination is strongly recommended for: (1) ultra-low emission compliance (≤ 10 mg/Nm³), (2) oxidizing flue gas (high O₂ / NOx), (3) sticky or fine particulate streams. For standard coal flue gas without oxidation concerns, singed and calendered PPS is sufficient and more cost-effective.
Q6: Can PPS filter bags be made anti-static? Yes. Anti-static PPS 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.
Q7: 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), (5) dust type & concentration, (6) emission requirement, (7) quantity. A drawing or sample bag is even better.
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