P84 Needle Felt
P84 Needle Felt is a high-temperature industrial filter media made from Polyimide fiber. It is widely used in dust collection systems requiring excellent fine dust filtration, high chemical resistance, and stable operation under high-temperature conditions.
Key Features: Trilobal fiber structure for enhanced fine particulate capture, continuous operation at 240–260°C, low moisture absorption, stable chemical resistance, and long service life.
Technical Specifications
| Item | Description |
|---|---|
| Product Name | Polyimide Needle Felt |
| Material | Polyimide Fiber |
| Fiber Structure | Trilobal / Irregular Cross-Section |
| Base Structure | Needle-Punched Nonwoven Felt |
| Optional Composite Structure | PTFE Membrane / Fiberglass Scrim Reinforcement |
| Typical Weight | 500–550 g/m² |
| Thickness | 2.0–2.3 mm |
| Air Permeability | 16–20 m³/m²/min |
| Continuous Operating Temperature | 240–260°C |
| Instant Maximum Temperature | Up to 280°C |
| Color | Natural Golden Yellow |
Main Advantages
| Advantage | Practical Value |
|---|---|
| Excellent High Temperature Resistance | Suitable for continuous operation in high-temperature flue gas systems. |
| High Filtration Efficiency | Trilobal fiber increases surface area and improves fine particulate capture. |
| Low Operating Pressure Drop | Surface filtration structure enhances dust release and cleaning performance. |
| Good Chemical Resistance | Stable resistance to acidic flue gases including SOx, NOx, and HCl. |
| Long Service Life | Typical service life reaches 3–4 years under proper conditions. |
| Low Moisture Absorption | Suitable for moderate humidity operating environments. |
| Good Flame Resistance | Non-thermoplastic fiber with stable thermal performance. |
Main Disadvantages
| Disadvantage | Practical Impact |
|---|---|
| Limited Alkali Resistance | High alkaline moisture conditions may cause hydrolysis degradation. |
| Static Electricity Risk | Anti-static treatment recommended for combustible dust applications. |
| Sensitive to Harsh Flue Gas Conditions | High oxygen, SOx, and NOx concentrations may accelerate aging. |
| Long-Term Extreme Temperature Aging | Continuous operation near max temperature may reduce fiber strength. |
| Higher Material Cost | More expensive than Polyester or PPS filter media. |
Typical Surface Treatments
- Heat Setting – Improves dimensional stability.
- Singeing & Calendaring – Improves surface smoothness and dust release.
- Water & Oil Repellent Treatment – Improves moisture resistance and reduces sticky dust adhesion.
- PTFE Membrane Lamination – Enhances surface filtration efficiency and lowers emissions.
- Anti-Static Treatment – Reduces electrostatic accumulation in combustible dust environments.
Typical Industrial Applications
- Waste Incineration Plants – High-temperature flue gas filtration.
- Cement Industry – Cement kiln inlet and outlet dust collection.
- Coal-Fired Boilers – High-temperature combustion exhaust filtration.
- Steel & Metallurgical Industry – Furnace and smelting exhaust dust collection.
- Asphalt Mixing Plants – Hot gas and fine particulate filtration.
- Biomass Power Plants – Biomass combustion flue gas filtration.
- Chemical Industry – High-temperature acidic exhaust gas filtration.
