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Polyamide (PI/P84) Needle Felts

Using the highest quality fiber materials and world-class needling techniques and equipment, HL Filter manufactures a wide range of Polyamide needle felts with high dust-holding capacity and good air permeability. The PI/P84 media has good chemical resistance, but this is endangered under highly alkaline moisture conditions. There is a limited tendency to oxidation through O2 or NO2 at high temperatures.
Bulk Roll Goods: weight, thickness, density, roll width, and roll length are customized at your request.
  • Product Details




Features & Benefits

High termperature needle punched felt 

Non-flammable and thermostable organic fiber 

Offers extended bag life in low pH applications 

helps reduce differential pressure across the baghouse 

Operates in high temperature applications against acid attacks and is resistant to flex abrasion (unlike Fiberglass). 

Not recommend for high concentration of alkalis at high temperatures.

Continuous operating temperature 460oF (240°C)


Fiber MaterialsPI-PolyimidePI-PolyimidePI-PolyimidePolyimide + Aramid
ScrimPolyimide scrimFiberglass scrimPTFE ScrimPolyimide scrim
Standard Finish Options
(Special surface treatments available)
Heat Set, Singed, Glazed, PTFE membrane (or PTFE bath)
oz/yd² (g/m2)
14.75-17.70 (500-600)23.60-26.55 (800-900)14.75-17.70 (500-600)550

   Inch (mm)
0.075-0.091 (1.9-2.3)0.098-0.12 (2.5-3)0.075-0.091 (1.9-2.3)(2.3-2.7)
Air Permeability
 CFM@ ½" W.G125PA
 (m³/m².min@200PA )
27-33 (13-16)22-33 (10-16)6-10 (3-5)
  Tensile Strength
 lb/in (N/5CM)
Warp MD 69 (600)205 (1800)69 (600)>900
Weft CD91 (800)205 (1800)91 (800)>1200
Tensile Elongation (%)Warp MD ≤25≤10≤25<35
Weft CD≤45≤10≤45<50
Burst Strength(Mpa/min)2.4-2.552.95-3.22.4-2.552.4-2.55
Thermal Shrinkage (%) at max continuous temp.Warp MD ≤1≤1≤1≤1
Weft CD≤1.5≤1.5≤1.5≤1.5
Max. Operating Temperature  oF (oC)Continuous465 (240)465 (240)465 (240)465 (240)
Surge500 (260)500 (260)500 (260)500 (260)
The data are based on laboratory conditions. 
Testing based on specific operating conditions of each installation is recommended.


Power Generation

Cement, Mining & Rock Products 

Asphalt & Aggregate 

Mining & Minerals 

Waste Incineration 

Chemicals & Pharmaceuticals 

Food & Beverages 

Custom OEM Applications

Most common applications include: smelters, dryers, coal-fired boilers, incinerators, kilns, and calciners.

Ordering Information

Customized per order

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